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【新文速递】2025年3月26日固体力学SCI期刊最新文章

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今日更新:International Journal of Solids and Structures 2 篇,International Journal of Plasticity 2 篇,Thin-Walled Structures 9 篇

International Journal of Solids and Structures

Self-excited fluctuation of sliding velocity induced by LuGre friction in a minimal mechanical model

Balazs J. Bekesi, Gabor Csernak

doi:10.1016/j.ijsolstr.2025.113293

最小力学模型中LuGre摩擦引起的滑动速度自激波动

The paper explores various bifurcations that can occur due to the variation of the linear internal damping (bristle damping) term in the LuGre friction model. To capture the essence of the nonlinear effects associated with friction, we consider a minimal mechanical model: a block sliding on a horizontal surface, which is subjected to a constant external force and the LuGre friction force with a viscous damping term. Despite the simplicity of the mechanical model, six different bifurcation scenarios are identified, involving Hopf bifurcations. Due to the emerging limit cycles – that may undergo fold or homoclinic bifurcations, as well – the slipping velocity and the friction force fluctuate near the Stribeck characteristic at sufficiently large bristle damping values. This phenomenon can be considered as a self-excited counterpart of the well-known frictional lag phenomenon.

本文探讨了由于LuGre摩擦模型中线性内阻尼(鬃毛阻尼)项的变化而可能发生的各种分岔。为了捕捉与摩擦相关的非线性效应的本质,我们考虑了一个最小力学模型:在水平表面上滑动的块,它受到恒定的外力和带有粘性阻尼项的LuGre摩擦力。尽管力学模型很简单,但我们确定了六种不同的分岔情况,包括Hopf分岔。由于出现了极限环——也可能发生褶皱或同斜分叉——在足够大的刚毛阻尼值下,滑移速度和摩擦力在Stribeck特性附近波动。这种现象可以看作是众所周知的摩擦滞后现象的自激对应。


The determination of interfacial strength in Al/SiC long fibre composites

Luke J. Rollings, Samuel A. McDonald, M.J. Roy, Philip J. Withers

doi:10.1016/j.ijsolstr.2025.113335

Al/SiC长纤维复合材料界面强度的测定

The interfacial properties have been measured for a novel AA6061/SiC-C coated silicon carbide SM3256 monofilamentary fibre (Al/SiC f ) MMC with a variant of the single fibre test. In this test, fibre fragmentation is followed in situ using synchrotron X-ray diffraction to probe the axial fibre elastic strains as a function of applied loading, while X-ray radiography is used to follow the fracture sequence. In this way, the variation in axial fibre stress along the fibre is tracked and hence the variation in interfacial shear stress along the fibre inferred at stages of fibre fragmentation. Prior to loading, the fibre was in a state of axial compression ( ≈ 280 MPa) due to thermal residual stresses representative of cooling from 200 °C. During the fragmentation process, the variations in axial strain and interfacial stress show characteristic “stick–slip” behaviour, where the fibre interface must exceed a threshold stress ( τ deb = 94 ± 10 MPa), close to the shear strength of the matrix before debonding. Once debonded, the fibre slides at a frictional shear stress, τ fr , initially of around 40 MPa, but falling with increased sliding distance to around τ fr = 15 ± 5 MPa. Radiography taken during loading, and post-mortem, indicates that interfacial failure occurs at the fibre-coating interface, leaving coating material lining the pull-out within the matrix. The accumulation of coating damage may be responsible for the progressive decrease in sliding stress with increased sliding. These sliding stresses, are much lower than observed for comparable Ti/SiC composites, and would facilitate significant fibre-pull-out and fibre bridging under fatigue conditions.

采用单纤维测试的方法,对新型AA6061/SiC- c涂层碳化硅SM3256单丝纤维(Al/SiC f) MMC的界面性能进行了测试。在本试验中,使用同步加速器x射线衍射原位跟踪纤维断裂,探测纤维轴向弹性应变作为施加载荷的函数,同时使用x射线照相跟踪断裂顺序。这样,沿纤维轴向应力的变化被跟踪,从而在纤维碎裂阶段推断沿纤维界面剪切应力的变化。在加载之前,由于来自200°C冷却的热残余应力,纤维处于轴向压缩状态(≈280 MPa)。在破碎过程中,轴向应变和界面应力的变化表现出典型的“粘滑”行为,其中纤维界面必须超过阈值应力(τ deb = 94±10 MPa),接近基体的抗剪强度。一旦脱粘,纤维在摩擦剪切应力τ fr下滑动,最初约为40 MPa,但随着滑动距离的增加而下降,约为τ fr = 15±5 MPa。加载过程中拍摄的x射线照片和事后分析显示,纤维涂层界面发生了界面破坏,导致涂层材料衬里在基体内被拉出。涂层损伤的累积可能是导致滑动应力随滑动量的增加而逐渐减小的原因。这些滑动应力远低于同类Ti/SiC复合材料,并将促进疲劳条件下显著的纤维拉出和纤维桥接。


International Journal of Plasticity

Strain Gradient-induced Size Effect of Nickel-Titanium Shape Memory Alloys

Jae-Hoon Choi, Hyemin Ryu, Ji-Young Kim, Kwang-Hyeok Lim, Gi-Dong Sim

doi:10.1016/j.ijplas.2025.104309

应变梯度诱导的镍钛形状记忆合金尺寸效应

This study investigates size effect in nickel-titanium (NiTi) shape memory alloys (SMAs), focusing on their elastic deformation and phase transformation behaviors. A series of experiments, including bulk-scale tension tests, micro-scale tension, compression, and cantilever bending tests, were conducted to observe the effect of specimen dimensions on SMA behavior. Micro-scale tension and compression tests unveiled a notable asymmetry in the stress-induced phase transformation, irrespective of specimen dimensions. Moreover, micro-cantilever bending tests, spanning a thickness range from 1.9 to 21.0 μm, revealed a significant increase in both the effective elastic modulus and phase transformation stress as the beam thickness decreased. A constitutive model has been developed to address the tension/compression asymmetry and size effect based on couple stress theory, and implemented in finite element analysis of beam structures. Finally, experimental results were compared with simulation outcomes, and the deformation mechanisms responsible for the size effect were discussed. The growing prominence of SMAs in micro/nano-scale applications highlights the necessity of understanding and accounting for size effects. Therefore, developing the capability to measure and simulate size effects is crucial for ensuring the effective utilization of SMAs in these scales.

本研究对镍钛(NiTi)形状记忆合金(SMA)的尺寸效应进行了探究,重点关注其弹性变形和相变行为。开展了一系列实验,包括宏观拉伸试验、微观拉伸、压缩和悬臂弯曲试验,以观察试样尺寸对形状记忆合金行为的影响。微观拉伸和压缩试验揭示了应力诱导相变的显著不对称性,且不受试样尺寸的影响。此外,厚度范围在 1.9 至 21.0 微米的微悬臂弯曲试验表明,随着梁厚的减小,有效弹性模量和相变应力均显著增加。基于偶应力理论,开发了一个能解决拉伸/压缩不对称性和尺寸效应的本构模型,并将其应用于梁结构的有限元分析。最后,将实验结果与模拟结果进行了比较,并讨论了导致尺寸效应的变形机制。形状记忆合金在微/纳米级应用中的日益突出地位凸显了理解并考虑尺寸效应的必要性。因此,开发测量和模拟尺寸效应的能力对于确保形状记忆合金在这些尺度上的有效利用至关重要。


A texture-dependent yield criterion based on Support Vector Classification

Jan Schmidt, Surya R. Kalidindi, Alexander Hartmaier

doi:10.1016/j.ijplas.2025.104311

基于支持向量分类的纹理相关屈服准则

Conventional yield criteria for anisotropic plasticity rely on linear transformations of the stress tensor to map the directional dependence of critical stress tensors at yield onset onto a unit sphere in stress space. These linear transformations are made material specific by a number of anisotropic parameters, which need to be determined by experimental procedures for each material. One drawback of this approach is that these anisotropic parameters cannot be explicitly expressed as functions of the crystallographic texture. Hence, any change in the texture of a material, as it occurs during cold deformation, requires a complete re-parametrization of the yield function. In this work, we present a data-oriented yield criterion based on Support Vector Classification (SVC) that is an explicit function of the crystallographic texture. This texture-dependency is achieved by including the coefficients of the general spherical harmonics (GSH) series expansion of the orientation distribution function (ODF) to the feature space of the machine learning model. The capabilities of the proposed yield criterion are demonstrated by training the model on a dataset containing micromechanical data from over 8000 distinct cubic-orthorhombic textures. The trained SVC combines the efficiency of classical phenomenological models with the flexibility of elaborate CP models. It provides a path to efficient hierarchical materials modeling as the anisotropy of the macroscopic yield onset is explicitly linked to the crystallographic texture.

传统的各向异性塑性屈服准则依赖于应力张量的线性变换,将屈服开始时临界应力张量的方向依赖性映射到应力空间的单位球上。这些线性变换是由许多各向异性参数决定的,这些参数需要通过每种材料的实验程序来确定。这种方法的一个缺点是,这些各向异性参数不能明确地表示为晶体织构的函数。因此,在冷变形过程中发生的材料织构的任何变化,都需要对屈服函数进行完全的重新参数化。在这项工作中,我们提出了一个基于支持向量分类(SVC)的面向数据的屈服标准,该标准是晶体织构的显式函数。这种纹理依赖性是通过将方向分布函数(ODF)的一般球面谐波(GSH)级数展开的系数包含到机器学习模型的特征空间中来实现的。它为有效的分层材料建模提供了一条途径,因为宏观屈服开始的各向异性与晶体织构明确地联系在一起。


Thin-Walled Structures

Testing, simulation and design of built-up cold-formed steel-lightweight concrete (CFS-LWC) composite beams subjected to elevated temperatures

Rohola Rahnavard, Hélder D. Craveiro, Rui A. Simões, Luís Laím, Aldina Santiago, Leroy Gardner

doi:10.1016/j.tws.2025.113212

高温下冷弯钢-轻量混凝土(CFS-LWC)组合梁的试验、模拟和设计

Cold-formed steel (CFS) products are lightweight, structurally efficient and highly versatile, making them suitable for a wide range of construction applications. Although studies have been performed to analyse the flexural behaviour of CFS composite beams at room temperature, their performance at elevated temperatures has yet to be investigated; this is, therefore, the focus of the present study. Through experiments, the structural fire performance of innovative built-up CFS-lightweight concrete (LWC) composite beams is examined. Two full-scale fire tests on simply-supported CFS-LWC composite beams are presented. The test setup, test procedure and obtained results, including the temperature evolution, fire resistance time and failure modes, are described. A numerical modelling study is also presented through which additional insights into the observed structural behaviour are gained. Comparisons between the experimental results and those determined according to EN 1994-1-2 design provision are presented. The results showed that, despite the studied CFS-LWC composite sections being beyond the scope of the code, good predictions of fire resistance were obtained.

冷弯型钢(CFS)产品重量轻,结构高效,用途广泛,适用于各种建筑应用。虽然已经进行了研究来分析CFS复合梁在室温下的弯曲行为,但它们在高温下的性能尚未进行研究;因此,这是本研究的重点。通过试验,研究了新型组合梁的结构防火性能。介绍了两种简支CFS-LWC组合梁的全尺寸火灾试验。介绍了试验装置、试验步骤和试验结果,包括温度演变、耐火时间和失效模式。数值模拟研究也提出了通过观察到的结构行为获得额外的见解。并将试验结果与en1994 -1-2设计规定的结果进行了比较。结果表明,尽管所研究的CFS-LWC复合材料截面超出了规范的范围,但获得了较好的耐火性预测。


Tensile and shear performance of detachable tapered-head bolt inter-module connection of steel modular structure

Anling Zhang, Jiadi Liu, Zhihua Chen

doi:10.1016/j.tws.2025.113228

钢组合结构可拆卸锥头螺栓模间连接的抗拉剪切性能

The connections between modular units significantly impact the construction speed and load-bearing capacity of modular steel structures. However, most existing inter-module connections struggle to meet the installation requirements at central connections, often necessitating openings in the module columns, walls, or floor slabs to provide installation space. This leads to internal redecoration after the connections have been installed, reducing construction efficiency and increasing costs. The detachable tapered-head bolt connection is a new type of connection that enables rapid installation and removal of central connection in modular buildings. In this paper, the tensile and shear performance of the connection under static loading is investigated, and the failure mode, bearing capacity and load-displacement response of the connection are investigated. The results indicate that the tensile failure mode of the connection includes the pull-out of the tapered-head bolt or the fracture of weld seam of the upper corner base plate. The shear failure mode is characterized by the shearing of the bolt and bearing-yield failure in the upper corner base plate. It is obtained that the thickness of the upper corner base plate and side plate as well as the diameter of the tapered-head bolt are the key design parameters of the connection. It is recommended that the thickness of the side plate should not be greater than that of the baseplate, otherwise the material strength of the side plate will not be fully utilized and the economy of the connection design will be reduced. Furthermore, the simplified analytical model of tensile resistance of the connection is established, and the calculation formula for the tensile capacity of the connection is developed. Additionally, the study confirms that the shear capacity of the connection can be calculated using the method outlined in GB50017-2017. These research results provide a reliable design basis and reference for the engineering application of detachable tapered-head bolt inter-module connection.

模块化单元之间的连接方式对钢结构的施工速度和承载能力有重要影响。然而,大多数现有的模块间连接难以满足中央连接的安装要求,通常需要在模块柱、墙壁或楼板上开开口来提供安装空间。这导致在连接安装后进行内部重新装修,降低了施工效率并增加了成本。可拆卸锥形头螺栓连接是一种新型的连接方式,可以在模块化建筑中快速安装和拆卸中心连接。本文研究了静荷载作用下连接的拉剪性能,并对连接的破坏模式、承载能力和荷载-位移响应进行了研究。结果表明,接头的拉伸破坏形式包括锥头螺栓的拔出或上角底板焊缝的断裂。剪切破坏模式主要表现为锚杆的剪切和上部角底板的受力破坏。得出了上角底板和侧板的厚度以及锥头螺栓的直径是连接的关键设计参数。建议侧板的厚度不应大于底板的厚度,否则将不能充分利用侧板的材料强度,降低连接设计的经济性。建立了连接抗拉能力的简化解析模型,推导了连接抗拉能力的计算公式。此外,研究还证实了采用GB50017-2017中概述的方法计算节点抗剪承载力。研究结果为可拆卸锥头螺栓模块间连接的工程应用提供了可靠的设计依据和参考。


Defects in double-sided incremental forming of woven fabric prepreg: experimental and numerical analysis

Peng Xu, Xiaoqiang Li, XiaoBing Li, Yi Wang, Weizhao Zhang, Hongrui Dong, Quan Zhi

doi:10.1016/j.tws.2025.113229

机织物预浸料双面增量成形缺陷:实验与数值分析

Forming processes of fiber reinforced polymers have been widely investigated for decades, driven by the need for lightweight, high-performance components in industries such as aerospace and automotive. However, the traditional forming techniques for composites often depend on the use of dies, which can be expensive and time-consuming to produce, resulting in increased overall manufacturing costs and extended production timelines, particularly for small batch production and prototype manufacturing. In this study, a die-less forming method, namely double-sided incremental forming (DSIF), was firstly investigated for the forming of woven fabric prepregs. Key manufacturing parameters, including the auxiliary dummy sheets (material, thickness and combinations) and tool diameters as well as their influence on forming quality, were systematically investigated. The mechanisms underlying the formation of macroscopic defects, such as wrinkling and fabric breakage, were analyzed through both experimental and numerical approaches. Results showed that dummy sheet selection and tool diameter significantly impact the prepreg forming quality in DSIF and defect-free parts can be obtained through optimized parameters. Specially, the combination of a hard upper dummy sheet and soft lower dummy sheet helped mitigate deformation discrepancies between the sheets and reduced prepreg wrinkling, while larger tool diameters minimized yarn failure by alleviating the high local contact pressures on the prepreg. The study can provide insights for future research and highlights the potential of DSIF for industrial applications, enabling more efficient small batch production and prototype manufacturing of complex composite parts.

几十年来,由于航空航天和汽车等行业对轻质、高性能部件的需求,纤维增强聚合物的成型工艺得到了广泛的研究。然而,复合材料的传统成型技术通常依赖于模具的使用,这可能是昂贵和耗时的生产,导致整体制造成本增加和生产时间延长,特别是小批量生产和原型制造。本文首次研究了机织物预浸料的无模成形方法,即双面增量成形(DSIF)。系统研究了辅助假人板(材料、厚度、组合)、刀具直径等关键制造参数对成形质量的影响。通过实验和数值方法分析了起皱和织物断裂等宏观缺陷的形成机制。结果表明,虚拟板的选择和刀具直径对DSIF预浸成形质量有显著影响,通过优化参数可以获得无缺陷零件。特别是,硬的上假人片和软的下假人片的组合有助于减轻片间的变形差异,减少预浸料起皱,而更大的工具直径通过减轻预浸料的高局部接触压力来最大限度地减少纱线故障。该研究可以为未来的研究提供见解,并突出DSIF在工业应用中的潜力,实现更高效的小批量生产和复杂复合材料零件的原型制造。


Mechanical Properties of a Novel Mechanical Metamaterial with Multi-stable and Mono-stable Characteristics

Min Sun, Zhiwei Qiu, Qiang Chen, Hongshuai Lei, Xia Hua, Zheng Zhang, Yi Song, Shaofei Jiang, Diyong Huang, Haonan Fu

doi:10.1016/j.tws.2025.113230

一种具有多稳定和单稳定特性的新型机械超材料的力学性能

This study designed a novel mechanical metamaterial with multi-stable and mono-stable characteristics, fabricated using carbon fiber composite through a hot-pressing process. The mechanical properties of the designed mechanical metamaterial were obtained through quasi-static compression tests, and the effects of structural geometric parameters on its mechanical performance were analyzed. The finite element model of the mechanical metamaterial was established, and the comparison between the simulation and experiment results showed good agreement. A torque test platform was constructed to measure the torque for transitions between the multi-stable and mono-stable characteristics. The results indicate that transitioning from mono-stable to multi-stable characteristics requires a higher torque than transitioning from multi-stable to mono-stable characteristics. The designed mechanical metamaterial has both multi-stable and mono-stable characteristics, which have potential for a wide range of applications in the field of impact energy absorption as well as vibration attenuation.

本研究设计了一种具有多稳定和单稳定特性的新型机械超材料,采用碳纤维复合材料热压工艺制备。通过准静态压缩试验获得了所设计的力学超材料的力学性能,并分析了结构几何参数对其力学性能的影响。建立了机械超材料的有限元模型,仿真结果与实验结果吻合较好。搭建了转矩测试平台,用于测量多稳特性和单稳特性转换时的转矩。结果表明,从单稳定过渡到多稳定比从多稳定过渡到单稳定需要更高的转矩。所设计的机械超材料具有多稳定和单稳定两种特性,在冲击能量吸收和振动衰减领域具有广泛的应用潜力。


Experimental Study of Non-reinforced Thin-walled Concrete-filled Double Skin Steel Tubular Bridge Columns with Socket Connection

Jiang Yi, Fuxiang Zhu, Wenjing Xu

doi:10.1016/j.tws.2025.113231

无筋薄壁双皮钢管混凝土承插连接桥柱试验研究

A novel non-reinforced thin-walled concrete-filled double skin steel tubular (NRTW-CFDST) structure with a socket connection is proposed for bridge columns. The advantages of this column include the absence of reinforcement, elimination of formwork installation and removal, and ease of customization, making it ideal for the rapid construction of short-line bridge piers with individualized size and height. Through experiments and finite element simulation analysis, the bending capacity and seismic performance of connection joints are investigated, and design recommendations for the novel column are provided. Experimental results indicate that the failure mode of the column is characterized by concrete crushing due to bending at the plastic hinge, and the full hysteresis curves indicate its good seismic performance. Importantly, the joints remained undamaged, demonstrating a significant reserve of bending capacity. For optimal performance, it is recommended to use a socket depth of 1.0 D to 1.2 D (D is the column section width) and a 6 mm thick base end plate. This configuration ensures adequate bending stiffness of the pier structure and a reasonable failure location at the plastic hinge.

提出了一种新型无钢筋薄壁双皮钢管混凝土承插连接结构。该柱的优点包括无需加固,无需安装和拆卸模板,易于定制,非常适合快速建造具有个性化尺寸和高度的短线桥墩。通过试验和有限元模拟分析,对连接节点的抗弯能力和抗震性能进行了研究,提出了新型柱的设计建议。试验结果表明,该柱的破坏模式为塑性铰处弯曲导致混凝土破碎,其全滞回曲线表明其具有良好的抗震性能。重要的是,接头保持完好无损,显示出弯曲能力的显著储备。建议插座深度为1.0 D ~ 1.2 D (D为柱截面宽度),底座端板厚度为6mm,以获得最佳性能。这种结构保证了桥墩结构有足够的抗弯刚度和合理的塑性铰失效位置。


Nonlinear response of high-strength cold-formed steel built-up members subject to cyclic compression

Shin Rui Kho, Adeline LingYing Ng, Daniel TingWee Looi, Hieng-Ho Lau, Emad Gad, Krishanu Roy

doi:10.1016/j.tws.2025.113233

循环压缩作用下高强度冷弯型钢组合构件的非线性响应

Cold-formed steel (CFS) built-up sections have attracted attention for their enhanced strength and stability over single channels. While previous research has focused on the axial behaviour of CFS built-up sections under monotonic compression, studies on their cyclic performance are limited. Cyclic actions can affect the material properties and potentially cause early failure, making it crucial to understand the cyclic behaviours of CFS built-up sections. This research examined the cyclic responses of G550 high-strength CFS built-up compression members through experimental and numerical investigations. Different built-up sections, such as open-lipped built-up sections (OL series) and closed-unlipped built-up sections (CU series), composed of various section sizes and screw spacings, were studied. These proposed parameters assessed the influence of the member slenderness and section slenderness on the CFS built-up sections with thin-walled profiles. The results demonstrated that the cyclic actions have little influence on the structural performance of the CFS built-up sections at the pre-peak stage. At the post-peak stage, a faster degradation in strength and stiffness was observed for specimens with greater member slenderness and section slenderness. Moreover, the increase in section slenderness leads to higher axial ductility for the CU series but minimal influence on the OL series. Furthermore, a greater member slenderness leads to smaller energy dissipation capacity, especially for the specimens with smaller section slenderness. The OL series is recommended to be designed as a strength-control element that provides structural stability and integrity, such as primary columns. In contrast, the CU series can be used as the sacrificial element to dissipate energy, such as lateral bracing in the framing system, to minimise the risk of catastrophic collapse subject to extreme loadings such as typhoons or earthquakes.

冷弯型钢(CFS)组合型钢因其比单道型钢具有更高的强度和稳定性而备受关注。虽然以往的研究主要集中在CFS组合截面在单调压缩下的轴向行为,但对其循环性能的研究有限。循环作用会影响材料性能,并可能导致早期破坏,因此了解CFS组合截面的循环行为至关重要。本文通过试验和数值研究对G550高强CFS组合受压构件的循环响应进行了研究。研究了不同截面尺寸和螺杆间距组成的不同组合段,如开唇形组合段(OL系列)和闭非唇形组合段(CU系列)。所提出的参数评估了构件长细和截面长细对薄壁型CFS组合截面的影响。结果表明,在峰值前阶段,循环作用对CFS堆砌截面的结构性能影响不大。峰后阶段,构件长细比和截面长细比越大,试件的强度和刚度退化越快。此外,截面长细比的增加导致CU系列的轴向延性提高,但对OL系列的影响最小。构件长细比越大,耗能能力越小,截面长细比越小的试件耗能能力越小。OL系列建议设计为强度控制元件,提供结构稳定性和完整性,如主柱。相比之下,CU系列可以用作消耗能量的牺牲元件,例如框架系统中的横向支撑,以最大限度地减少在台风或地震等极端载荷下发生灾难性倒塌的风险。


Seismic Performance of Damaged Steel-Concrete Shear Wall with Prestressed Diagonal Bracing Repaired by CFRP Strips

Jian-Gui Qin, Jie Tian, Yi-Xin Mai, Kai Qian, Xiao-Fang Deng

doi:10.1016/j.tws.2025.113234

CFRP条修复预应力斜撑钢-混凝土剪力墙的抗震性能

To investigate the seismic performance of damaged steel-concrete shear wall with prestressed diagonal bracing repaired by Carbon Fiber Reinforced Polymer (CFRP) strips. Three steel-concrete shear walls with diagonal bracing seriously damaged by low reversed cyclic loading were repaired by replacing damaged concrete, repairing diagonal bracing, restoring buckled reinforcements, and wrapping walls with CFRP strips. The seismic performance of the repaired specimens was evaluated using the same quasi-static test as for the original specimens. The seismic performance including the failure modes, deformation capacity, bearing capacity, energy dissipation, stiffness degradation, and bearing capacity degradation of the repaired specimens were researched in the study. Experimental results show that the used repair schemes effectively restore specimens’ bearing capacity, ductility, and energy dissipation, as well as enhancing deformation capacity. Applying an "X"-shaped CFRP repair scheme which aligned with the direction of the bracing can effectively compensates for the reductions of stiffness and bearing capacity due to cyclic loading. Compared to shear wall with smooth steel tubes as diagonal bracing, those with threaded reinforcements create a stronger mechanical interlocking effect between the bracing and concrete. This enhanced synergy interaction increases the effective shear resistance section in the midsection of the wall panel, thereby forming a more efficient diagonal load transfer mechanism. Therefore, shear damage can be avoided in the middle of the wall limb. Additionally, the study presents the theoretical calculation model for the original and the repaired shear walls, and the comparison of the calculation results with test results demonstrates that the calculation model has high computational accuracy.

研究碳纤维增强聚合物(CFRP)条修复损伤钢-混凝土斜撑剪力墙的抗震性能。采用更换破损混凝土、修复斜撑、恢复屈曲钢筋、CFRP条包墙等方法修复低反循环荷载严重破坏的3面钢-混凝土斜撑剪力墙。修复后试件的抗震性能采用与原试件相同的准静力试验进行评估。对修复试件的破坏模式、变形能力、承载力、耗能、刚度退化和承载力退化等抗震性能进行了研究。试验结果表明,所采用的修复方案能有效地恢复试件的承载力、延性和耗能,提高试件的变形能力。采用与支撑方向一致的“X”形CFRP修复方案,可以有效补偿循环加载造成的刚度和承载能力的降低。与光滑钢管作为斜支撑的剪力墙相比,螺纹加固的剪力墙在支撑和混凝土之间产生了更强的机械联锁效应。这种增强的协同作用增加了墙板中部的有效抗剪截面,从而形成更有效的斜向荷载传递机制。因此,可以避免墙肢中部的剪切破坏。建立了原剪力墙和修复后剪力墙的理论计算模型,并将计算结果与试验结果进行了比较,表明该计算模型具有较高的计算精度。


Data orbits similarity conversion law of scaled-down model tests of ship structures under strong impact loads

Xiongliang Yao, Renjie Huang, Kun Zhao, Yongran Yin

doi:10.1016/j.tws.2025.113235

强冲击载荷下船舶结构缩比模型试验数据轨道相似转换规律

The model test under strong impact loads constitutes a transient, strongly nonlinear, and non-stationary physical process that exhibits extreme sensitivity to system parameters, boundary conditions, and initial conditions. A minor perturbation induces bifurcation and abrupt changes in system dynamics, resulting in output uncertainty for model tests and significant challenges in achieving similarity conversion between models and prototypes. In this paper, the second law of similarity is applied to construct data orbits of impact responses for characterizing kinematic system evolution, and a principle of topologically conjugate conversion for similar systems in phase space is proposed. Through phase space reconstruction methodology, the kinematic evolution patterns of acceleration responses in ship structures under strong impact loads are investigated, with mapping functions of acceleration response data orbits derived in phase space. A similarity equation for model-to-prototype conversion is established based on the topologically conjugate conversion principle. Theoretical analysis demonstrates the rationality of introducing prediction coefficients in distortion models, while fundamental conditions for achieving similarity conversion in nonlinear dynamical systems are formulated. Finally, the numerical results from the single-layer reinforced plate rack and cabin section show that the data orbits corresponding to the acceleration responses of the 1:2 scaled model and the prototype have the same symbol sequences in the phase space under satisfying the similarity conversion condition, which verifies the correctness of the similarity conversion of data orbits for the scaling model test of the ship structures under the strong impact loads.

强冲击载荷下的模型试验是一个瞬态的、强非线性的、非平稳的物理过程,对系统参数、边界条件和初始条件表现出极大的敏感性。一个微小的扰动就会引起系统动力学的分叉和突变,从而导致模型测试的输出不确定,并且在实现模型和原型之间的相似性转换方面面临重大挑战。本文利用相似第二定律构造碰撞响应的数据轨道来表征运动系统的演化,并提出了相空间相似系统的拓扑共轭转换原理。采用相空间重构方法,研究了船舶结构在强冲击载荷作用下加速度响应的运动演化规律,推导了加速度响应数据轨道在相空间中的映射函数。基于拓扑共轭转换原理,建立了模型到原型转换的相似方程。理论分析证明了在畸变模型中引入预测系数的合理性,给出了非线性动力系统实现相似转换的基本条件。最后,对单层加筋板架和舱室截面的数值计算结果表明,在满足相似转换条件下,1:2比例模型和原型的加速度响应对应的数据轨道在相空间具有相同的符号序列,验证了数据轨道相似转换用于船舶结构在强冲击载荷下的比例模型试验的正确性。


Nonlinear buckling and post-buckling of multilayered piezoelectric graded porous circular nanoplates considering of surface/interface effects

Qinglu Li, Xiaojie Niu, Zhaoyi Pan, Jinghua Zhang

doi:10.1016/j.tws.2025.113236

考虑表面/界面效应的多层压电梯度多孔圆形纳米板的非线性屈曲和后屈曲

The special characteristics of surfaces and interfaces significantly influence the durability and performance of materials. For the first time, this article introduces surface and interface effects into Kirchhoff thin plate theory to study the buckling and nonlinear post-buckling behavior of multilayer piezoelectric porous nanostructures. The bulk structure is a graded porous material and pores are embedded in the plate in two cosine forms of non-uniform porosity distribution with a pair of piezoelectric layers surface bonded on both sides of the bulk surface. Then, classical plate theory, combined with minimum potential energy principle, is utilized to derive the post-buckling governing equation coupling the piezoelectric effect. A shooting method is presented to obtain the buckling and post-buckling numerical solutions. The numerical results obtained reveal that the surface and interface effects, along with the applied potential, significantly influence the stability of multilayer piezoelectric graded porous circular nanoplates to varying extents.

表面和界面的特殊特性对材料的耐久性和性能有重要影响。本文首次将表面和界面效应引入Kirchhoff薄板理论,研究了多层压电多孔纳米结构的屈曲和非线性后屈曲行为。块体结构为梯度多孔材料,孔隙以非均匀孔隙分布的两种余弦形式嵌入板中,块体表面两侧表面粘接一对压电层。然后,利用经典板理论,结合最小势能原理,推导出耦合压电效应的后屈曲控制方程。提出了一种求解屈曲和后屈曲数值解的射击方法。数值结果表明,表面和界面效应以及外加电位对多层压电梯度多孔圆形纳米板的稳定性有不同程度的显著影响。



来源:复合材料力学仿真Composites FEM
ACTMechanicalSystemDeform振动疲劳断裂复合材料碰撞非线性航空航天船舶汽车建筑ADS理论材料螺栓
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【新文速递】2025年3月12日复合材料SCI期刊最新文章

今日更新:Composite Structures 2 篇,Composites Part B: Engineering 10 篇,Composites Science and Technology 1 篇Composite StructuresBio-inspired hybrid composite fabrication 3D-printing approach for multifunctional flexible wearable sensors applicationsMuhammad Imran Farid, Wenzheng Wu, Guiwei Li, Yitong Sun, Zhibo Zhang, Fangyu Zhangdoi:10.1016/j.compstruct.2025.119046 多功能柔性可穿戴传感器的仿生混合复合材料制造3d打印方法A bio-inspired, hybrid, multifunctional flexible sensor is developed for wearable applications. The hybrid sensor is fabricated using Fused Deposition Modeling (FDM) 3D printing and incorporates significant technical innovations. This sensor integrates a thermoplastic polyurethane (TPU-base core body) filament, graphene, and Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) PEDOT: PSS made-composite, utilizing a novel dip-coating technique to create high-aspect-ratio channels. Critically, we have developed a new method to compensate for drooping in bridging layers during the FDM printing process, a significant challenge in achieving precise microstructures. Demonstrating its potential for strain, temperature, pressure, and health monitoring. Results exhibit a high gauge factor (GF) of ≈4033.2 at 30 % tensile strain, detect strains as low as 0.01 %, and achieve a stretchability of 250 %. Furthermore, it demonstrates sensitivity to pressures ranging (max 150 %, mini 10 Pa), dynamic stretching (at 2, 6, 9, 10, 18, 21 mm), and thermal performance (0–90 °C). Subsequently, we propose on-site monitoring; the sensor’s ability to detect subtle and vigorous human motions is highlighted, suggesting its suitability for bodily deformations including subtle movements. This approach, incorporating these key fabrication innovations, paves the way for advanced wearable sensors capable of detecting a wide range of human motions for diverse healthcare applications.一种生物启发,混合,多功能柔性传感器的开发可穿戴应用。该混合传感器采用熔融沉积建模(FDM) 3D打印制造,并结合了重要的技术创新。该传感器集成了热塑性聚氨酯(tpu基芯体)长丝、石墨烯和聚(3,4-乙烯二氧噻吩)-聚(苯乙烯磺酸盐)PEDOT: PSS制成的复合材料,利用新型浸涂技术创建高宽高比通道。关键的是,我们开发了一种新方法来补偿FDM打印过程中桥接层的下垂,这是实现精确微结构的重大挑战。展示了它在应变、温度、压力和健康监测方面的潜力。结果表明,在30 %的拉伸应变下,测量因子(GF)≈4033.2,检测应变低至0.01 %,拉伸性能达到250 %。此外,它还表现出对压力范围(最大150 %,最小10 Pa),动态拉伸(2,6,9,10,18,21 mm)和热性能(0-90 °C)的敏感性。随后,我们提出现场监测;该传感器能够检测细微而剧烈的人体运动,这表明它适合包括细微运动在内的身体变形。这种方法结合了这些关键的制造创新,为先进的可穿戴传感器铺平了道路,这些传感器能够检测各种医疗保健应用中的各种人体运动。Effects of shear connection methods on the performance of UHPFRC-NC hybrid beams with U-shaped GFRP stay-in-place formworksYaqi Li, Zihua Zhang, Zhenjun Yang, Muhirwa Fernand, Tao Jiangdoi:10.1016/j.compstruct.2025.119052剪切连接方式对u型GFRP模板UHPFRC-NC混合梁性能的影响This paper investigates the effects of shear connection methods on the performance of Ultra-high performance fiber reinforced concrete (UHPFRC)-normal concrete (NC) hybrid beams with U-shaped glass fiber-reinforced polymer (GFRP) stay-in-place (SIP) formworks. A total of 21 beams were tested under three-point bending to evaluate their load capacity, failure mechanisms, strain evolution, and cost performance. The specimens included 15 hybrid beams with various shear connection methods—resin-bonding, resin-bonding plus I-shaped GFRP profiles, and resin-bonding plus steel bolts at different spacings—as well as six control beams without SIP formworks for comparison. The complex microscale failure mechanisms were visualized through μXCT scanning. Results indicated that GFRP connectors demonstrated the highest bonding performance and load capacity among all connection methods, while steel bolt connectors provided the best post-failure ductility. The incorporation of SIP formworks significantly enhanced the structural performance of the hybrid beams, maximizing the utilization of UHPFRC’s high compressive strength. Compared to traditional reinforced UHPFRC beams, the hybrid beams achieved 22.7% higher peak loads while reducing UHPFRC usage by 63.2%. Cost effective analysis revealed that hybrid beams with GFRP connectors exhibit the best cost performance among different shear connection methods, with 68.2% higher than that of traditional reinforced UHPFRC beams.研究了不同剪切连接方式对u型玻璃纤维增强聚合物(GFRP)静置模板下超高性能纤维增强混凝土(UHPFRC)-普通混凝土(NC)混合梁性能的影响。共有21根梁在三点弯曲下进行了测试,以评估其承载能力、破坏机制、应变演化和性价比。试件包括15根采用不同剪切连接方式的混合梁——树脂粘接、树脂粘接+ i型GFRP型材、树脂粘接+不同间距钢螺栓——以及6根不采用SIP模板的对照梁进行比较。通过μXCT扫描显示了复杂的微尺度失效机制。结果表明,GFRP连接件的连接性能和承载能力最高,而钢栓连接件的破坏后延性最好。SIP模板的结合显著提高了混合梁的结构性能,最大限度地利用了UHPFRC的高抗压强度。与传统的UHPFRC增强梁相比,混合梁的峰值荷载提高了22.7%,同时UHPFRC的使用量减少了63.2%。成本效益分析表明,GFRP连接组合梁在不同剪切连接方式中性价比最佳,比传统UHPFRC加固组合梁的成本效益高68.2%。Composites Part B: EngineeringFrom nanoscale to printed products: Multiscale modeling and experimental characterization of graphene-enhanced polylactic acid composites for 3D printingAtta Muhammad, Clara Valero, Paolo De Angelis, Nikolaos Koutroumanis, Dionisis Semitekolos, Bárbara Jiménez, Rubén Rivera, Carlos Sáenz Ezquerro, Rajat Srivastava, Panagiotis-Nektarios Pappas, Costas Galiotis, Costas A. Charitidis, Eliodoro Chiavazzo, Pietro Asinari, Manuel Laspalas, Agustín Chiminelli, Matteo Fasanodoi:10.1016/j.compositesb.2025.112354 从纳米级到打印产品:3D打印石墨烯增强聚乳酸复合材料的多尺度建模和实验表征Carbon-based nanoparticles can significantly enhance the specific characteristics of polymers, impacting mechanical, thermal, electrical, and magnetic properties. However, incorporating these enhancements into final products can be challenging due to the influences of subsequent processing steps required to transform the material into components. This is the case of nano-modifications of 3D printing thermoplastic filaments. The filament characteristics and the printing process’s resulting material microstructure affect the final properties of the material produced. The resulting material exhibits a hierarchical multiscale structure, necessitating a combination of various simulation approaches and methods to capture the relevant effects and influences across different scales, ultimately allowing for accurate prediction of the final material response in the product. This study focuses on predicting key thermal and mechanical properties of polymer nanocomposites and 3D printing materials. The analysis is based on coarse-grained molecular dynamics and continuum models across different scales, complemented by experimental characterization of the base material (filament) and micrographic analysis of the printed material. The findings demonstrate the potential of modeling to predict various material responses. The multiscale model reveals that with a modest addition of nanofiller (up to 2 wt%), the Young’s modulus and thermal conductivity show up to 11% enhancement. These predictions closely align with the experiments, exhibiting a maximum deviation of 2.3%. In conclusion, this study demonstrates that the combination of diverse modeling techniques and experimental validation provides valuable guidance for materials development and engineering, as well as a deeper understanding of the process/structure/properties relationships.碳基纳米颗粒可以显著增强聚合物的特定特性,影响其机械、热学、电学和磁性能。然而,由于将材料转化为组件所需的后续加工步骤的影响,将这些增强功能整合到最终产品中可能具有挑战性。这是3D打印热塑性长丝的纳米改性的情况。长丝特性和打印过程中产生的材料微观结构影响所生产材料的最终性能。由此产生的材料呈现出分层的多尺度结构,需要结合各种模拟方法和方法来捕获不同尺度的相关效应和影响,最终允许准确预测产品中的最终材料响应。本研究的重点是预测聚合物纳米复合材料和3D打印材料的关键热性能和力学性能。分析是基于粗粒度的分子动力学和不同尺度的连续模型,辅以基础材料(长丝)的实验表征和印刷材料的显微分析。这些发现证明了建模预测各种材料响应的潜力。多尺度模型显示,适量添加纳米填料(高达2 wt%),杨氏模量和导热系数可提高11%。这些预测与实验结果非常吻合,最大偏差为2.3%。总之,本研究表明,多种建模技术和实验验证的结合为材料开发和工程提供了有价值的指导,以及对过程/结构/性能关系的更深入理解。INFLUENCE OF FIBER/MATRIX INTERFACE ON GAS PERMEABILITY PROPERTIES OF CF/TP COMPOSITESGautier Allusse, Olivier De Almeida, Quentin Govignon, Monica Pucci, Fabrice Schmidtdoi:10.1016/j.compositesb.2025.112358纤维/基体界面对cf / tp复合材料透气性的影响For hydrogen application, one of the most important material property required is low gas permeability. In composite materials, this property depends on the materials but also on the processing parameters. In particular the residual porosity, but also the quality of the fiber/matrix interface, play a crucial role. This is particularly the case in composites involving a thermoplastic matrix with carbon fibers as the lack of reactive groups on the fiber surface can limit the level of interfacial interactions between the reinforcement and the matrix. In this study, the role of the interface is analyzed through the investigation of the hydrogen permeability of carbon fiber reinforced thermoplastics (CF/PVDF and CF/PPS) using different polymers and carbon fibers. The hydrogen permeability of the composites was measured, and a correlation with the crystallization behavior of the matrix on the fiber surface was identified. Hydrogen permeability decreases when the fiber favors matrix nucleation. Nucleation is improved by increasing the surface roughness of the carbon fiber.对于氢气的应用,最重要的材料特性之一是低透气性。在复合材料中,这种性能不仅取决于材料本身,还取决于加工参数。特别是残余孔隙率,以及纤维/基体界面的质量,起着至关重要的作用。这在含有碳纤维的热塑性基体的复合材料中尤其如此,因为纤维表面缺乏活性基团会限制增强材料和基体之间的界面相互作用水平。本研究通过对不同聚合物和碳纤维的碳纤维增强热塑性塑料(CF/PVDF和CF/PPS)的渗氢性能的研究,分析了界面的作用。测定了复合材料的氢渗透性能,并确定了复合材料的氢渗透性能与纤维表面基体的结晶行为之间的关系。当纤维有利于基体成核时,氢渗透性降低。增加碳纤维的表面粗糙度可以改善成核。Multi-material 3D printing of continuous carbon fibre reinforced thermoset composites with tailored fibre paths and bespoke conforming thermoplastic mouldsHaoqi Zhang, Aonan Li, Jiang Wu, Dongmin Yangdoi:10.1016/j.compositesb.2025.112373 多材料3D打印连续碳纤维增强热固性复合材料,具有定制的纤维路径和定制的符合热塑性塑料模具This paper proposes a novel additive manufacturing approach for rapid, integrated fabrication of complex structures made from 3D-printed composites with low porosity and a high continuous fibre content. Continuous carbon fibre reinforced epoxy composites with >50% fibre volume fraction were printed in parallel with short carbon fibre reinforced polyamide-6 (PA6) conforming moulds which have a melt temperature higher than the curing temperature of epoxy. The research further optimised the continuous fibre paths through experiments and as-manufactured finite element simulations, using 3D-printed truss structures under three-points bending as a case study. Additionally, the incorporation of polylactic acid (PLA) with a lower melting temperature, enhanced compatibility and bonding between the epoxy and PA6. The approach was applied and demonstrated for a lightweight composite wing box using tailored material interface and customised reinforcement alongside varying infill densities. This approach also opens up possibilities for assembling lightweight, large-scale composite structures using 3D-printed high-performance continuous carbon fibre units.本文提出了一种新的增材制造方法,用于快速集成制造具有低孔隙率和高连续纤维含量的3d打印复合材料制成的复杂结构。采用熔体温度高于环氧树脂固化温度的短碳纤维增强聚酰胺-6 (PA6)成型模具并联打印纤维体积分数为> ~ 50%的连续型碳纤维增强环氧复合材料。该研究以三点弯曲下的3d打印桁架结构为例,通过实验和制造的有限元模拟进一步优化了连续纤维路径。此外,聚乳酸(PLA)的掺入具有较低的熔融温度,增强了环氧树脂与PA6之间的相容性和粘合性。该方法被应用于轻型复合材料翼盒中,该翼盒采用了定制的材料界面和定制的增强材料以及不同的填充密度。这种方法也为使用3d打印高性能连续碳纤维单元组装轻质大规模复合结构提供了可能性。Engineered Advanced Light-weight Sustainable Composites from Surface Modified Recycled Carbon Fiber Reinforced Polyamide 6,6 for Metallic Part Alternative in AutomotivesKehinde Olonisakin, Arturo Rodriguez-Uribe, Tao Wang, Amar K. Mohanty, Mahendra Thimmanagari, Manjusri Misradoi:10.1016/j.compositesb.2025.112375 由表面改性再生碳纤维增强聚酰胺6,6制成的先进轻质可持续复合材料,用于汽车金属部件的替代The study focuses on utilizing recycled carbon fiber (rCF) as a reinforcement material in high-performance polyamide 6,6 (PA 6,6) advanced composites for lightweight automotive applications. Two types of rCF were used: untreated and polyurethane treated (pu-rCF). The composite materials were prepared through melt-extrusion followed by injection molding, with varying rCF weight percentages (20 and 25%). The pu-rCF demonstrated improved fiber-matrix adhesion, leading to enhanced mechanical performances than untreated rCF. The highest tensile strength and modulus achieved were 180 MPa and 16 GPa, respectively. The flexural strength and flexural modulus showed maximum values of 274 MPa and 13 GPa, respectively. The heat deflection temperature reached 246°C for the 25 wt.% pu-rCF composites. Fourier-transform infrared spectroscopy suggests chemical interactions between the fibers and PA 6,6, which was confirmed by the fiber-matrix adhesion study from dynamic mechanical analyses. Flammability testing indicated that the composites reinforced with rCF and 20wt.% pu-rCF achieved a V2 rating in the UL-94 vertical test. Rheological analysis revealed that pu-rCF increases the stiffness of the composite due to improved fiber-matrix interaction. These advanced composites offer high-strength, lightweight sustainable alternatives to metallic components currently used in door frames, bumpers, seat frames in automotive structures.该研究的重点是利用再生碳纤维(rCF)作为增强材料,制成高性能聚酰胺6,6 (pa6,6)高级复合材料,用于汽车轻量化应用。使用两种类型的rCF:未经处理和聚氨酯处理(pu-rCF)。复合材料通过熔融挤压和注射成型制备,rCF重量百分比分别为20%和25%。与未经处理的rCF相比,pu-rCF具有更好的纤维基质粘附性,从而提高了机械性能。最高抗拉强度和模量分别为180 MPa和16 GPa。抗弯强度和抗弯模量的最大值分别为274 MPa和13 GPa。25wt % pu-rCF复合材料的热变形温度达到246℃。傅里叶红外光谱分析表明,纤维与pa6,6之间存在化学相互作用,这一结果得到了动态力学分析中纤维-基质粘附研究的证实。可燃性试验表明,用rCF和20wt增强复合材料。% pu-rCF在UL-94垂直测试中达到V2等级。流变分析表明,pu-rCF增加了复合材料的刚度,因为改善了纤维-基质的相互作用。这些先进的复合材料为目前汽车结构中门框、保险杠、座椅框架中使用的金属部件提供了高强度、轻量化的可持续替代品。A promising high-temperature oxygen barrier of ZrB2-HfSi2-TaSi2 coating for 1500 °C based on HfSi2-TaSi2 dual-transition-metal silicide alloying enhancementYuexing Chen, Xiang Ji, Peipei Wang, Zhichao Shang, Chengshan Ji, Zhengang Zhang, Philipp V. Kiryukhantsev-Korneev, Evgeny A. Levashov, Xuanru Ren, Peizhong Fengdoi:10.1016/j.compositesb.2025.112384基于HfSi2-TaSi2双过渡金属硅化物合金化强化的ZrB2-HfSi2-TaSi2涂层的1500℃高温氧障研究To enhance the self-healing capability and high-temperature oxidation resistance of ZrB2-silicon-based coatings, HfSi2-TaSi2 dual-transition metal silicide alloying reinforcement was used in ZrB2-HfSi2-TaSi2 coatings, and the oxygen barrier reinforcement effect on different ratios of HfSi2-TaSi2 alloying compositions was investigated. The results demonstrate that the synergistic strengthening effect of HfSi2-TaSi2 dual silicide alloying significantly enhances the stability at high temperatures and the oxygen barrier performance of the coatings. Notably, the coating containing 30 vol.% TaSi2 exhibited optimal oxidation resistance, with a mass change rate reduction of 79.32% and an oxygen permeability decrease of 93.75%. This observed improvement in performance is attributed to the stabilization of the glassy structure through the action of TaSi2 via a "network compensation" mechanism, which effectively inhibits the aggregation of oxide particles. However, an excess of TaSi2 resulted in the depolymerization of the glassy film, diminishing its defect-healing capacity and leading to an increase in oxygen permeability to 0.53%. This research provides new insights for the development of efficient oxidation-resistant coatings.为了提高zrb2 -硅基涂层的自愈能力和高温抗氧化性,在ZrB2-HfSi2-TaSi2涂层中加入了双过渡金属硅化物合金化增强剂,并研究了不同比例的HfSi2-TaSi2合金化成分对氧障增强效果的影响。结果表明:HfSi2-TaSi2双硅化物合金的协同强化作用显著提高了涂层的高温稳定性和氧阻隔性能。值得注意的是,含有30 vol.% TaSi2的涂层具有最佳的抗氧化性能,质量变化率降低了79.32%,氧渗透率降低了93.75%。这种观察到的性能改善归因于TaSi2通过“网络补偿”机制的作用使玻璃结构稳定,该机制有效地抑制了氧化物颗粒的聚集。然而,过量的TaSi2导致玻璃膜的解聚,降低了其缺陷愈合能力,导致氧通透性增加到0.53%。该研究为高效抗氧化涂料的开发提供了新的思路。Microstructure and Mechanical Properties of Nano TiB Whisker-Reinforced Titanium Matrix Composites using Atomized Ti-TiB Composite Powder as Raw MaterialsLei Liu, Shufeng Li, Shaolong Li, Huiying Liu, Shaodi Wang, Dongxu Hui, Xin Zhang, Shota Kariya, Ammarueda Issariyapat, Junko Umeda, Katsuyoshi Kondoh, Bolv Xiao, Zongyi Madoi:10.1016/j.compositesb.2025.112392以雾化Ti-TiB复合粉末为原料制备纳米TiB晶须增强钛基复合材料的组织与力学性能In situ formed TiB-reinforced titanium matrix composites (TMCs) have gained significant attention for their high specific modulus and strength. However, the high sintering temperatures required for in situ reactions and densification can cause rapid coarsening of TiB whiskers, limiting the improvements in mechanical properties. This study proposes a "low-temperature sintering + hot extrusion" method to prepare nano TiB-reinforced Ti-TiB composites. The process involves low-temperature sintering at 800 °C—below the HCP-Ti phase transformation temperature—followed by hot extrusion for densification. The resulting Ti-TiB composites feature TiB with diameters of approximately 123 nm. The yield strength (YS) and ultimate tensile strength (UTS) of the nano TiB-reinforced Ti-TiB composites reach 632 MPa and 833 MPa, respectively, reflecting increases of 70% and 51% compared to microscale TiB-reinforced Ti-TiB composites, while maintaining an elongation (El) of 13.97%. The size evolution of TiB in the composites follows a temperature-dependent progression. Below 800 °C, TiB remains nanoscale, while temperatures above 800 °C, TiB grows to the microscale. The failure mode also shifts with TiB size, from interfacial debonding at the microscale to load-bearing fracture at the nanoscale. Additionally, the refinement of matrix grains and the obstruction of dislocations by nanoscale TiB further improve mechanical properties. This work opens a new controllable and facile route for preparing nano TiB-reinforced titanium matrix composites with promising properties.原位成形tib增强钛基复合材料(TMCs)因其高比模量和强度而受到广泛关注。然而,原位反应和致密化所需的高烧结温度会导致TiB晶须迅速粗化,限制了机械性能的提高。本研究提出了“低温烧结+热挤压”制备纳米tib增强Ti-TiB复合材料的方法。该工艺包括800°c的低温烧结-低于HCP-Ti相变温度-然后是热挤压致密化。所得Ti-TiB复合材料的TiB直径约为123 nm。纳米tib增强Ti-TiB复合材料的屈服强度(YS)和极限抗拉强度(UTS)分别达到632 MPa和833 MPa,与微尺度tib增强Ti-TiB复合材料相比,分别提高了70%和51%,伸长率(El)保持在13.97%。复合材料中TiB的尺寸演变遵循温度依赖的过程。在800°C以下,TiB保持纳米级,而在800°C以上,TiB生长到微米级。破坏模式也随着TiB尺寸的变化而变化,从微观尺度的界面脱粘到纳米尺度的承载断裂。此外,纳米TiB对基体晶粒的细化和位错的抑制进一步改善了材料的力学性能。本工作为制备具有良好性能的纳米tib增强钛基复合材料开辟了一条可控、简便的新途径。3D printing of heat-resistant thermosetting polyimide composite with high dimensional accuracy and mechanical propertyXinyu Du, Yi Liu, Wei Zhao, Lin Fan, Song Mo, Lei Zhai, Minhui He, Dan Peng, Qiuhong Mou, Gong Wangdoi:10.1016/j.compositesb.2025.1123943D打印具有高尺寸精度和机械性能的耐热热固性聚酰亚胺复合材料3D printing of polyimide parts with high heat resistance, dimensional accuracy and mechanical property is quite challenging because the manufacturing requirements restrict molecular structural design. Hence, combination of molecular design of thermosetting polyimide oligomer and a two-step reactive 3D printing strategy is conducted. Siloxane-containing phenylethynyl-terminated polyimide oligomer powders with milled carbon fibers are developed, which can be precured with laser scanning in a selective laser sintering (SLS) equipment, forming self-standing green parts with complex geometries. These green parts can be thermally postcured to polyimide parts with high dimensional stability. The linear shrinkage in Z axis is less than 4.74%. Oligomers experience crosslinking of phenylethynyl groups and oxidation crosslinking of siloxane units during SLS and postcuring. Therefore, the printed polyimide parts give a tensile strength of 82 MPa and a glass transition temperature of 419 oC. Honeycombs fabricated by this strategy give higher specific compression strength and can withstand temperature as high as 400 oC. The wear-resistant self-lubricating materials prepared by this approach exhibit a reliable tribological property after atomic oxygen and ultraviolet irradiations. These findings will provide useful insight for designing and fabricating structural components with complex shapes that might be applied in aerospace extreme environment.3D打印具有高耐热性、尺寸精度和机械性能的聚酰亚胺部件是相当具有挑战性的,因为制造要求限制了分子结构设计。因此,将热固性聚酰亚胺低聚物的分子设计与两步反应性3D打印策略相结合。研究了含硅氧烷的端部苯基乙基聚酰亚胺低聚物粉末,并采用选择性激光烧结(SLS)设备对其进行了激光扫描预处理,形成了具有复杂几何形状的独立绿色部件。这些绿色部件可以热固化成具有高尺寸稳定性的聚酰亚胺部件。Z轴线收缩率小于4.74%。低聚物在SLS和固化后经历了苯乙基的交联和硅氧烷单元的氧化交联。因此,打印的聚酰亚胺部件的抗拉强度为82 MPa,玻璃化转变温度为419℃。通过这种策略制造的蜂窝具有更高的比压缩强度,并且可以承受高达400℃的温度。该方法制备的耐磨自润滑材料经原子氧和紫外线辐照后具有可靠的摩擦学性能。这些发现将为设计和制造可能应用于航空航天极端环境的复杂形状结构部件提供有用的见解。Integrated hydrogel of fucoidan and rhCol III for bioprosthetic heart valves to promote the antithrombosis, anti-inflammatory, and anti-calcification propertiesKaiyang Huang, Cheng Zheng, Xueyu Huang, Bangquan Wei, Lepeng Chen, Gaocan Li, Li Yang, Yunbing Wangdoi:10.1016/j.compositesb.2025.112396岩藻糖聚糖和rhCol III集成水凝胶用于生物人工心脏瓣膜,促进抗血栓形成,抗炎和抗钙化性能Glutaraldehyde cross-linked bioprosthetic heart valves (BHVs) have been widely used in clinical practice for its superior hemodynamic properties and significantly reduced requirement on anticoagulant therapy. However, the lifespan and biocompatibility of BHVs remain limited due to thrombus accumulation, poor endothelialization, inflammation, and progressive calcification. In this study, we introduced heparin-like fucoidan and recombinant humanized type III collagen (rhCol III) into glutaraldehyde cross-linked BHVs (GLUT) through photoinduced polymerization, thereby preparing an integrated hydrogel functionalized BHV (Fu-rhCol III). This multifunctional hydrogel formed a biocompatible barrier, providing robust protection for internal valve fibers and exhibiting strong resistance to platelet adhesion and thrombus formation in vitro. The Fu-rhCol III effectively reduced the cytotoxicity of GLUT, accelerating the endothelialization process. Fu-rhCol III maintained the structural stability and mechanical properties brought by glutaraldehyde cross-linking. This composite hydrogel demonstrated the significant suppression of acute inflammatory responses and satisfactory anti-calcification effect in subcutaneous implantation test. 60-day implantation results indicated that calcium deposition of Fu-rhCol III decreased by 96% compared with GLUT. In summary, this integrated hydrogel modification provides a promising strategy for future design of BHVs.戊二醛交联生物人工心脏瓣膜(bhv)因其优越的血流动力学特性和显著降低抗凝治疗需求而广泛应用于临床。然而,由于血栓积聚、内皮化不良、炎症和进行性钙化,bhv的寿命和生物相容性仍然有限。在本研究中,我们通过光诱导聚合,将类肝素岩藻聚糖和重组人源化III型胶原(rhCol III)引入戊二醛交联BHV (GLUT)中,从而制备了一种集成水凝胶功能化BHV (Fu-rhCol III)。这种多功能水凝胶形成了一种生物相容性屏障,为内部瓣膜纤维提供了强大的保护,并在体外表现出很强的抗血小板粘附和血栓形成的能力。Fu-rhCol III有效降低GLUT的细胞毒性,加速内皮化过程。Fu-rhCol III保持了戊二醛交联带来的结构稳定性和力学性能。该复合水凝胶在皮下植入试验中表现出明显的抑制急性炎症反应和良好的抗钙化效果。60 d的植入结果表明,与GLUT相比,Fu-rhCol III的钙沉积减少了96%。总之,这种综合水凝胶改性为未来bhv的设计提供了一种很有前途的策略。Collaborative Improvement of Interfacial Properties of Carbon Fiber/Epoxy Resin Composites Through Modulus/Toughness Matching and Gradient InterfaceYujie Yue, Guojun Song, Li Li, Jie Zhao, Xupeng Li, Guoqiang Cao, Xiang Luo, Bentao Yu, Min Fang, Yuankai Li, Guangshun Wu, Lichun Madoi:10.1016/j.compositesb.2025.112398基于模量/韧性匹配和梯度界面协同改善碳纤维/环氧树脂复合材料界面性能The interface is crucial for the mechanical properties of composite which is tightly linked to the microstructure of CF surface and resin matrix. However, the modulus mismatch between CF and resin leads to stress concentration and poor interfacial performance. This study proposes a bidirectional structural design strategy aimed at optimizing the interfacial performance of CF/epoxy composites from the perspective of interfacial construction and modulus matching. An organic-inorganic three-dimensional hybrid particle <PDI,GO> (the notation <PDI,GO> indicates a composite formed between PDI and GO through both chemical and physical interactions) was synthesized to enhance the modulus and toughness of resin, as well as the chemical bonding, mechanical entanglement and wettability with resin of CF surface. Compared to the original and single pathway (either the CF or resin), the transverse tensile strength of the bidirectionally modified composites increased by 68.4 %, 31.2 % and 18.0 %, and the interlaminar shear strength increased by 23.6 %, 8.5 %, 18.6 %, respectively. Furthermore, a comprehensive exploration of synergistic reinforcement mechanisms and stress dispersion patterns at the composites was conducted. This bidirectional structural design strategy provides a new avenue for the next-generation high-performance composites in the fields of aerospace, rail transit and so on.界面对复合材料的力学性能起着至关重要的作用,它与碳纤维表面和树脂基体的微观结构密切相关。然而,CF与树脂之间的模量不匹配导致应力集中和界面性能差。本研究提出了一种双向结构设计策略,旨在从界面结构和模量匹配的角度优化CF/环氧复合材料的界面性能。合成了一种有机-无机三维杂化颗粒<PDI,GO>(符号<PDI,GO>表示PDI与GO通过化学和物理相互作用形成的复合材料),以提高树脂的模量和韧性,以及CF表面与树脂的化学键合、机械缠结和润湿性。与原始路径和单一路径(CF或树脂)相比,双向改性复合材料的横向抗拉强度分别提高了68.4%、31.2%和18.0%,层间抗剪强度分别提高了23.6%、8.5%和18.6%。此外,还对复合材料的协同增强机制和应力分散模式进行了全面的探索。这种双向结构设计策略为下一代高性能复合材料在航空航天、轨道交通等领域的应用提供了新的途径。Unexpected Processing-Induced Particle/Matrix Interactions in Magnetic Composites Based on Thermoplastic MatrixAndrei Munteanu, Alenka Vesel, Arman Moini Jazani, Michal Sedlacik, Petra Drohsler, Martin Cvekdoi:10.1016/j.compositesb.2025.112399 基于热塑性基体的磁性复合材料中意外加工诱导的颗粒/基体相互作用Understanding processing-induced changes in the polymer composites is of the utmost necessity as it affects the final properties and the reliability of the products. Despite their importance, related investigations are frequently overlooked, especially in the case of magnetorheological elastomers (MREs). In this study, the processing-induced changes were investigated within an isotropic MRE based on a thermoplastic elastomer (TPE) matrix loaded with carbonyl iron (CI) microparticles. Systematic thermomechanical tests in the molten state were used to mimic the processing conditions, revealing the time evolution of the particle/matrix interactions. The interactions manifested as an increase in the viscoelastic properties, which was attributed to the development of a secondary network composed of the confined polymer chains in the vicinity of the CI particles. The restricted mobility improved the reinforcing effect and structural integrity but diminished the field-induced stiffening of the composite, i.e., the magnetorheological effect. The existence of the particle/matrix covalent bonding was postulated and explained based on the coupling reaction between the thermomechanically-induced radicals formed in the polymer chain and the alkoxyl radicals on the surface of the CI particles. The new findings are highly relevant for the further development of reprocessable and recyclable TPE-based MREs, while the robust measuring protocol is deemed to be implementable for studying particle/matrix interactions in diverse composite systems.了解加工引起的聚合物复合材料的变化是非常必要的,因为它会影响产品的最终性能和可靠性。尽管它们很重要,但相关研究经常被忽视,特别是在磁流变弹性体(MREs)的情况下。在这项研究中,研究了基于热塑性弹性体(TPE)基质加载羰基铁(CI)微粒的各向同性MRE中加工引起的变化。在熔融状态下进行了系统的热力学测试,模拟了加工条件,揭示了颗粒/基体相互作用的时间演变。这种相互作用表现为粘弹性的增加,这是由于在CI颗粒附近形成了由受限聚合物链组成的二级网络。受限的迁移率提高了复合材料的增强效果和结构完整性,但减弱了复合材料的场致硬化,即磁流变效应。基于热机械诱导的聚合物链自由基与CI颗粒表面的烷氧基自由基之间的偶联反应,假设并解释了颗粒/基体共价键的存在。这些新发现与进一步开发可再处理和可回收的tpe基MREs高度相关,而稳健的测量方案被认为可用于研究不同复合系统中的颗粒/基质相互作用。Composites Science and TechnologyA Multifunctional Flexible Sensor with Dual-Conductive Networks for Monitoring Human Motion Signals and Sweat pH/Lactic AcidHaoze Du, Yiwei Li, Ran Chen, Shichen Liang, Shuoqi Tian, Yuhao Cao, Ning Cui, Hui Yangdoi:10.1016/j.compscitech.2025.111130 用于监测人体运动信号和汗液pH/乳酸的双导电网络多功能柔性传感器Flexible wearable sensors have garnered significant attention for monitoring human motion signals and detecting sweat composition due to their high flexibility, consistency, and low cost. However, existing problems such as poor conductivity, inadequate flexibility, low sensitivity and unstable sensing performance present bottlenecks to their further development. This paper presents a novel highly-conductive, ultra-soft, and freeze-resistant poly(acrylamide-acrylic acid)/polyaniline/lithium bromide (PAMAAni/LiBr) hydrogel for monitoring human motion signal and detecting pH and lactic acid in sweat. The hydrogel establishes a dual conductive network by integrating the conjugated structure of polyaniline with the ionization principle of LiBr, which endows the hydrogel with excellent conductivity (4.6 S/m). Interactions between hydrogel networks, LiBr, and water molecules contribute to the hydrogel's low modulus (3.47 kPa) and remarkable freeze-resistant ability. Flexible sensors assembled from this hydrogel demonstrate a wide detection range (0.5%-200%), high sensitivity (strain range from 50% to 150%, gauge factor=3.24), and excellent fatigue resistance (exceeding 2000 cycles). This flexible sensor demonstrates high sensitivity in monitoring human activities in multiple scenarios, including joint movements, handwriting, and precise robotic hand control. Additionally, it exhibits excellent electrochemical performance for pH detection (pH 1-12) and lactic acid measurement with a wide detection range (0.25 mM-50 mM) and a low detection limit (1.98 μM), providing valuable insights for the development of innovative flexible wearable sensing devices.柔性可穿戴传感器由于其高灵活性、一致性和低成本,在监测人体运动信号和检测汗液成分方面受到了极大的关注。但目前存在电导率差、柔韧性不足、灵敏度低、传感性能不稳定等问题,是制约其进一步发展的瓶颈。本文介绍了一种新型的高导电性、超软性、抗冻性的聚(丙烯酰胺-丙烯酸)/聚苯胺/溴化锂(PAMAAni/LiBr)水凝胶,用于监测人体运动信号和检测汗液中的pH和乳酸。该水凝胶将聚苯胺的共轭结构与LiBr的电离原理相结合,建立了双导电网络,使水凝胶具有优异的电导率(4.6 S/m)。水凝胶网络、LiBr和水分子之间的相互作用使水凝胶具有低模量(3.47 kPa)和出色的抗冻能力。由该水凝胶组装的柔性传感器具有宽检测范围(0.5%-200%),高灵敏度(应变范围从50%到150%,测量因子=3.24)和优异的抗疲劳性(超过2000次循环)。这种柔性传感器在多种情况下监测人类活动具有高灵敏度,包括关节运动,手写和精确的机械手控制。此外,它在pH检测(pH 1-12)和乳酸检测中表现出优异的电化学性能,具有宽检测范围(0.25 mM-50 mM)和低检测限(1.98 μM),为创新柔性可穿戴传感设备的开发提供了宝贵的见解。 来源:复合材料力学仿真Composites FEM

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