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【新文速递】2024年5月6日复合材料SCI期刊最新文章

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今日更新:Composite Structures 7 篇,Composites Part B: Engineering 3 篇,Composites Science and Technology 1 篇

Composite Structures

Adaptive deep homogenization theory for periodic heterogeneous materials

Jiajun Wu, Qiang Chen, Jindong Jiang, George Chatzigeorgiou, Fodil Meraghni

doi:10.1016/j.compstruct.2024.118171

周期性非均质材料的自适应深度均质理论

We present an adaptive physics-informed deep homogenization neural network (DHN) approach to formulate a full-field micromechanics model for elastic and thermoelastic periodic arrays with different microstructures. The unit cell solution is approximated by fully connected multilayers via minimizing a loss function formulated in terms of the sum of residuals from the stress equilibrium and heat conduction partial differential equations (PDEs), together with interfacial traction-free or adiabatic boundary conditions. In comparison, periodicity boundary conditions are directly satisfied by introducing a network layer with sinusoidal functions. Fully trainable weights are applied on all collocation points, which are simultaneously trained alongside the network weights. Hence, the network automatically assigns higher weights to the collocation points in the vicinity of the interface (particularly challenging regions of the unit cell solution) in the loss function. This compels the neural networks to enhance their performance at these specific points. The accuracy of adaptive DHN is verified against the finite element and the elasticity solution respectively for elliptical and circular cylindrical pores/fibers. The advantage of the adaptive DHN over the original DHN technique is justified by considering locally irregular porous architecture where pore–pore interaction makes training the network particularly slow and hard to optimize.

我们提出了一种自适应物理信息的深度均匀化神经网络(DHN)方法来建立具有不同微观结构的弹性和热弹性周期阵列的全场微观力学模型。通过最小化由应力平衡和热传导偏微分方程(PDEs)的残差总和以及界面无牵引力或绝热边界条件所表示的损失函数,完全连接的多层近似表示单元胞解。相比之下,引入带正弦函数的网络层可以直接满足周期性边界条件。在所有的并置点上应用完全可训练的权值,并与网络权值同时训练。因此,网络自动为损失函数中界面附近的配点(特别是具有挑战性的单元胞解区域)分配更高的权重。这迫使神经网络在这些特定点上增强其性能。分别针对椭圆孔/纤维和圆筒形孔/纤维的有限元和弹性解验证了自适应DHN的准确性。考虑到局部不规则的孔隙结构,使得训练网络特别缓慢且难以优化,自适应DHN技术优于原始DHN技术。


Modeling of thin-walled edge cutting angle in end milling of honeycomb cores

Chao Li, Chunzheng Duan, Chao Wang, Xiaodong Tian, Longyun Yang, Xiaochen Li, Shaoshuai Yuan

doi:10.1016/j.compstruct.2024.118173

蜂窝芯端铣薄壁刃口切削角建模

Thin-walled edge cutting angle (TWECA) refers to a unique trait of honeycomb core materials in the course of cutting, which is also a main influencing factor for the surface quality of machining. To validly overcome machining defects, making accurate TWECA prediction during the cutting process is necessary. In this study, a TWECA model for various kinds of thin-walled edges was proposed. Firstly, the thin-walled edges composing honeycomb cores were classified and unified based on the structural features of the cores, which lays the foundation for the modeling of honeycomb core architecture as well as the TWECA prediction. Then, the geometric relationships between tool and various types of thin-walled edges during contact were analyzed, and the differences in TWECAs of thin-walled edges in different tool feed directions were explored. Finally, the TWECA model accuracy was validated by using the tool mark characteristics on the machined surface as the research target. As demonstrated by findings of this research, our model achieves accurate TWECA forecasting during cutting process, thus providing a theoretical foundation for the requirements of low-damage and high-quality machining.

薄壁边缘切削角(TWECA)是蜂窝芯材料在切削过程中所具有的一种独特特性,也是影响加工表面质量的主要因素。为了有效地克服加工缺陷,在切削过程中进行准确的TWECA预测是必要的。本文提出了一种适用于各种薄壁边缘的TWECA模型。首先,根据蜂窝芯的结构特征,对蜂窝芯构成的薄壁边缘进行分类统一,为蜂窝芯结构建模和TWECA预测奠定基础;然后,分析了刀具与不同类型薄壁边缘在接触过程中的几何关系,探讨了不同刀具进给方向薄壁边缘TWECAs的差异。最后,以加工表面刀具刻痕特征为研究目标,验证了TWECA模型的精度。研究结果表明,该模型在切削过程中实现了准确的TWECA预测,为实现低损伤、高质量加工的要求提供了理论依据。


Detection of edge delamination in composite laminates using edge waves

Jinhang Wu, Chang Jiang, Ching-Tai Ng, Han Fang

doi:10.1016/j.compstruct.2024.118177

利用边缘波检测复合材料层合板的边缘分层

Detecting near-edge damage in composite structural elements using guided wave-based techniques can be challenging, primarily due to the complexity of wave analysis arising from material anisotropy. Furthermore, scattered waves containing damage information can be contaminated by waves reflected from the edges, which makes detecting near-edge damage difficult to implement. In the literature, studies showed that in elastic materials, the edge of a structure can serve as a waveguide, enabling the existence of typical edge modes with concentrated energy at the edge. However, studies regarding edge waves in composite structures have received limited attention. This paper aims to explore the potential of detecting edge delamination damage in composite laminates using edge waves. The modal properties of edge waves in [(0/90)2]s composite laminates are investigated using the Semi-Analytical Finite Element (SAFE) method. Additionally, dispersion curves for quasi-isotropic composite laminates are calculated. Following this, numerical and experimental studies were conducted to investigate the sensitivity of edge waves in detecting edge delamination in the [(0/90)2]s composite laminates. The outcomes of this study offer physical insights into the modal properties of edge waves and confirm their effectiveness in detecting damage near the edges.

利用导波技术检测复合材料结构元件的近边缘损伤具有挑战性,主要是由于材料各向异性引起的波分析的复杂性。此外,包含损伤信息的散射波可能被边缘反射波污染,这使得近边缘损伤检测难以实现。文献研究表明,在弹性材料中,结构的边缘可以作为波导,使得边缘存在能量集中的典型边缘模式。然而,关于复合材料结构中边缘波的研究却受到了有限的关注。本文旨在探讨利用边缘波检测复合材料层合板边缘脱层损伤的潜力。采用半解析有限元法研究了[(0/90)2]s复合材料层合板边缘波的模态特性。此外,计算了准各向同性复合材料层合板的色散曲线。在此基础上,对边缘波在[(0/90)2]s复合材料层合板边缘分层检测中的灵敏度进行了数值和实验研究。本研究的结果提供了对边缘波模态特性的物理见解,并证实了它们在检测边缘附近损伤方面的有效性。


Repeated loading damage analysis of thin-walled composite shell for lighter structural design

Honghao Liu, Lei Zu, Qian Zhang, Ping Ren, Guiming Zhang, Jianhui Fu, Helin Pan, Qiaoguo Wu, Huabi Wang, Debao Li, Lichuan Zhou

doi:10.1016/j.compstruct.2024.118178

面向轻量化结构设计的薄壁复合材料壳体重复载荷损伤分析

The composite shell is one of the crucial components of solid rocket motors. Its design goal is to reduce the shell mass as much as possible while ensuring technical and cost requirements. This paper proposes a damage analysis method for the thin-walled composite shell secondary loading process based on a refined finite element model to verify the damage caused by the thin-walled composite shell secondary loading process and the performance decline of the shell and to assist in the lightweight design of the thin-walled composite shell. The shell’s damage failure state and crack propagation path are analyzed by establishing the acceptable finite element model and introducing the damage failure criterion and the stiffness degradation model. Based on the model, the damage state of the shell during the secondary loading process is described, and it is determined that the re-loading has little effect on the blasting performance of the shell. For composite shells used in small quantities, the effects of damage due to initial loading can be of no concern during design. This method can provide a theoretical basis for thin-walled composite shell safety factor selection and damage state assessment to achieve the thin-walled composite shell lightweight design goal.

复合壳体是固体火箭发动机的关键部件之一。其设计目标是在保证技术和成本要求的同时,尽可能减少壳体质量。本文提出了一种基于精细化有限元模型的薄壁复合材料壳体二次加载过程损伤分析方法,以验证薄壁复合材料壳体二次加载过程造成的损伤和壳体性能下降情况,为薄壁复合材料壳体的轻量化设计提供辅助。通过建立可接受有限元模型,引入损伤破坏准则和刚度退化模型,分析了壳体的损伤破坏状态和裂纹扩展路径。基于该模型,描述了二次装填过程中炮壳的损伤状态,确定了二次装填对炮壳爆破性能影响不大。对于少量使用的复合材料壳体,在设计过程中可以不考虑初始载荷的损伤影响。该方法可为薄壁复合材料壳体的安全系数选择和损伤状态评估提供理论依据,实现薄壁复合材料壳体轻量化设计目标。


Shear behavior of circular concrete short columns reinforced with GFRP longitudinal bars and CFRP grid stirrups

JinJing Liao, Bo Di, Yu Zheng, Zhi-Wen Xuan, Jun-Jie Zeng

doi:10.1016/j.compstruct.2024.118181

GFRP纵筋和CFRP格栅箍加固圆形混凝土短柱的抗剪性能

Although fiber-reinforced polymer (FRP) reinforcements have become popular, the post-pultrusion bending leads to significant deficiency in bent portions. This study adopts flexible carbon FRP (CFRP) grids as stirrups, and investigates the shear behavior of circular short columns reinforced with GFRP bars and CFRP grid stirrups. Six specimens with different shear reinforcement ratios, axial load ratios and types of stirrups (CFRP grids and steel hoops) were tested to shear failures. The failure models, crack and strain developments, and shear load-horizontal displacement responses are presented for discussion. All specimens experienced shear-compression failures, and the critical diagonal crack widths increased approximately linearly with shear loads. The typical shear load-horizontal displacement curve consists of three branches: a linear elastic branch, a cracking branch with progressive slope deteriorations, and an almost flat failure branch. Increasing CFRP grid stirrup ratio could not only enhance strength and ductility performances, but also alleviate the slope degradations, while increasing axial load ratio could enhance the initial cracking load, restrain crack propagations, and reduce the lateral displacements. In terms of strength performance, steel hoops can be replaced by CFRP grid stirrups even with smaller stirrup ratio. Additionally, analytical investigations suggested that the effective stresses and strains of CFRP grids at failure may be lower than code limits.

尽管纤维增强聚合物(FRP)增强材料已成为流行,但拉挤后弯曲导致弯曲部分显着不足。本研究采用柔性碳纤维布(CFRP)格栅作为箍筋,研究了碳纤维布筋和碳纤维布格栅箍筋加筋圆形短柱的抗剪性能。对6个具有不同抗剪配筋率、轴向载荷比和不同箍筋类型(CFRP格栅和钢箍)的试件进行了抗剪破坏试验。提出了破坏模型、裂缝和应变发展以及剪切荷载-水平位移响应的讨论。所有试件均经历剪切压缩破坏,且临界斜缝宽度随剪切荷载近似线性增加。典型的剪切荷载-水平位移曲线包括三个分支:线弹性分支、边坡逐步退化的开裂分支和几乎平坦的破坏分支。增加碳纤维布格筋比不仅可以提高强度和延性,还可以缓解边坡的退化,而增加轴向荷载比可以提高初始开裂荷载,抑制裂缝扩展,减小侧向位移。在强度性能方面,即使箍比较小,碳纤维布格栅箍也可以代替钢箍。此外,分析研究表明,CFRP网格在破坏时的有效应力和应变可能低于规范限值。


Dynamic stability analysis of laminated cylindrical shells considering fluid–structure interaction

Jihang Feng, Yongfu Wu, Jianghong Xue, Jixin Lin

doi:10.1016/j.compstruct.2024.118183

考虑流固耦合的层合圆柱壳动力稳定性分析

This paper investigates the dynamic stability of laminated cylindrical shell submerged in a fluid. Assuming that the fluid is incompressible satisfying the Laplace equation, the coupling relationship between the external pressure from fluid acting on the cylindrical shell and the velocity potential function of the fluid is deduced by using Bernoulli law. Based on Kárman-Donnell’s thin shell theory, the governing equations for dynamic buckling of the composite laminated cylinder are established by introducing the constitutive relationship for laminated composite structures. Likely functions of the displacement and the stress function for cylindrical shell are proposed to construct Mathieu-Hill equation for dynamic stability of laminated cylindrical shell with fluid–structure interaction and the first three order dynamic instability regions are derived. A good agreement between the solutions from the proposed analysis and from the available literatures justified the accuracy and validity of the proposed analysis. With the established analysis, the influence of various parameters on the dynamic stability of cylinders are analyzed, from which a dynamic stability enhancement scheme suitable for composite laminated cylinders is summarized. It is found that the fluid–structure interaction will greatly reduce the excitation frequency of laminated cylindrical shells but has no effect on their vibration modes.

本文研究了层合圆柱壳在流体中的动力稳定性。假设流体是不可压缩的,满足拉普拉斯方程,利用伯努利定律推导了作用于圆柱壳的流体的外压力与流体的速度势函数之间的耦合关系。以Kárman-Donnell薄壳理论为基础,引入复合材料层合结构的本构关系,建立了复合材料层合圆柱体动态屈曲的控制方程。提出了柱壳的位移函数和应力函数的似然函数,建立了流固耦合作用下层合柱壳动力稳定的Mathieu-Hill方程,并推导出了层合柱壳的前三阶动力不稳定区域。所提分析的解与现有文献的解之间的良好一致性证明了所提分析的准确性和有效性。在此基础上,分析了各参数对复合材料复合气瓶动力稳定性的影响,总结出适合复合材料复合气瓶的动力稳定性增强方案。研究发现,流固耦合作用会大大降低层合圆柱壳的激振频率,但对层合圆柱壳的振动模态没有影响。


Effect of BFRP ties on the axial performance of RC columns reinforced with BFRP and GFRP rebars

Farid Abed, Nour Ghazal Aswad, Khaled Obeidat

doi:10.1016/j.compstruct.2024.118184

BFRP筋对BFRP筋和GFRP筋配筋RC柱轴向性能的影响

The adoption of fiber-reinforced polymer (FRP) bars in lieu of traditional steel reinforcement for concrete structures has gained prominence. Nevertheless, prevailing international standards have not incorporated provisions to assess the significant contribution of FRP materials to the axial capacity and deformability of compression members. This study investigates the impact of Basalt (BFRP) ties on the axial performance of full-scale concrete columns reinforced with BFRP and Glass (GFRP) rebars, alongside traditional steel longitudinal rebars. Ten columns were subjected to concentric loading, with parameters including the type of longitudinal rebars (BFRP, GFRP, and steel), spacing of BFRP ties (180 mm, 120 mm, and 60 mm), and diameter of steel rebars (16 mm and 20 mm). Varied steel rebar diameters aimed to discern the influence of axial stiffness on column behavior. Results indicate an 18 % to 26 % higher axial load capacity in steel-reinforced concrete (RC) columns compared to FRP-RC columns. Both types of FRP rebars contributed approximately 12 % to the axial capacity. Reducing BFRP tie spacing from 180 mm to 60 mm significantly increased deformability by up to 250 % in FRP-RC columns and ductility by up to 14 % in steel-RC columns. The study highlights conservative predictions in existing design equations (ACI 440.11–22 and CSA S806-12) for the axial load capacity of BFRP and GFRP RC columns, underestimating by 14 % to 20 %, as they neglect the contribution of FRP rebars. Utilizing a concrete crushing strain of 3,000 µε and 3,500 µε as the ultimate FRP compressive strain produced predictions closest to the experimental axial load capacity

采用纤维增强聚合物(FRP)钢筋代替传统的钢筋用于混凝土结构已得到重视。然而,现行的国际标准并没有纳入规定来评估FRP材料对受压构件的轴向能力和变形能力的重大贡献。本研究探讨了玄武岩(BFRP)绑扎对BFRP和玻璃(GFRP)钢筋加筋的全尺寸混凝土柱轴向性能的影响,以及传统的纵向钢筋。对10根柱进行同心加载,参数包括纵向钢筋类型(BFRP、GFRP和钢材)、BFRP筋间距(180 mm、120 mm和60 mm)和钢筋直径(16 mm和20 mm)。不同的钢筋直径旨在辨别轴向刚度对柱性能的影响。结果表明,钢-钢筋混凝土(RC)柱的轴向承载力比FRP-RC柱高18 %至26 %。两种FRP筋对轴向承载力的贡献约为12% %。将BFRP筋间距从180 mm减少到60 mm,可显著提高FRP-RC柱的变形能力高达250 %,钢- rc柱的延性高达14 %。该研究强调了现有设计方程(ACI 440.11-22和CSA S806-12)对BFRP和GFRP RC柱轴向承载能力的保守预测,低估了14% %至20% %,因为它们忽略了FRP筋的贡献。利用混凝土破碎应变为3000µε和3500µε作为FRP极限压缩应变,得出的预测结果最接近实验轴向载荷能力


Composites Part B: Engineering

Micro-CT image-based computation of effective thermal and mechanical properties of fibrous porous materials

Donglai Liu, Hailong Chen, Luis A. Chacon, Vijay Mohan Ramu, Savio J. Poovathingal

doi:10.1016/j.compositesb.2024.111502

基于微ct图像的纤维状多孔材料有效热力学性能计算

Fibrous porous materials are extensively employed as heat shielding material for space vehicles and capsules. To predict the performance of these materials using computational modeling at the vehicle/capsule scale, the effective material properties are needed. In this work, the effective thermal conductivity and elastic constants of a carbon fibrous porous material called FiberForm (precursor of PICA) were calculated using a direct image-based approach. In this image-based approach, the microstructures obtained using X-ray computed tomography technique are represented as binary voxel data. Nonlocal interactions are introduced between neighboring voxels. Integro-differential equations, with respect to spatial and temporal dimensions respectively, are developed to govern material thermal and mechanical behaviors. Using this approach, energy-based computational procedures were developed to calculate the effective material properties of fibrous and porous materials irrespective of the periodicity of underlying microstructures. The size of representative volume element was determined by convergence of effective properties with respect to microstructure size.

纤维多孔材料作为航天飞行器和太空舱的热屏蔽材料得到了广泛的应用。为了在车辆/胶囊尺度上使用计算模型预测这些材料的性能,需要有效的材料特性。在这项工作中,使用基于直接图像的方法计算了碳纤维多孔材料FiberForm (PICA前体)的有效导热系数和弹性常数。在这种基于图像的方法中,使用x射线计算机断层扫描技术获得的微观结构被表示为二值体素数据。相邻体素之间引入了非局部相互作用。积分微分方程,分别相对于空间和时间维度,开发来控制材料的热和力学行为。利用这种方法,开发了基于能量的计算程序来计算纤维和多孔材料的有效材料性能,而不考虑底层微观结构的周期性。代表性体积元的尺寸由有效性能对微观结构尺寸的收敛决定。


Insight into annealing-induced hardening and softening behaviors in a laser powder-bed fusion printed in-situ composite eutectic high-entropy alloy

Yinuo Guo, Haijun Su, Hongliang Gao, Zhonglin Shen, Peixin Yang, Yuan Liu, Di Zhao, Zhuo Zhang, Min Guo

doi:10.1016/j.compositesb.2024.111523

 

激光粉末床熔印原位复合共晶高熵合金退火诱导硬化和软化行为的研究

Laser powder-bed fusion (LPBF) printed AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) typically exhibits an in-situ composite structure with an out-of-equilibrium character. Its distinctive hierarchical microstructure implies the potential challenges and opportunities in engineering advanced materials with high performances. Here, an informative overview of the microstructure evolution across various scales and its effect on tensile properties in LPBFed AlCoCrFeNi2.1 subjected to annealing treatments over a wide temperature range is discussed. Microstructural observations indicate that spinodal decomposition within the B2 lamellae becomes evident after annealing at 500 °C, marked by a pronounced compositional fluctuation of Cr. Annealing the sample at 600 °C leads to the precipitation of BCC nanoparticles through structural disordering of Cr-rich regions within the modulated nanostructure. Tensile tests and strengthening models reveal that the annealing-induced hardening responses are largely associated with precipitation strengthening resulting from the ordering strengthening of L12 nanoprecipitates and the coherency and modulus strengthening of BCC nanoprecipitates, as well as the spinodal hardening from modulated nanostructure. Notably, BCC precipitation strengthening plays a crucial role in enhancing the strength of the annealed alloys. A strong precipitation strengthening effect is realized due to the coarsening of the BCC and L12 nanoprecipitates at 600 °C, and the strengthening effect from BCC precipitates gradually weakens as their dissolution at 650 °C, resulting in abnormal hardening behavior. Upon annealing at higher temperatures (700 ∼ 1000 °C), phase decomposition, precipitation dissolution, even recrystallization occur sequentially, resulting in varying degrees of softening behaviors.

激光粉末床熔合(LPBF)打印的AlCoCrFeNi2.1共晶高熵合金(EHEA)具有典型的非平衡原位复合结构。其独特的层次化微观结构意味着高性能工程先进材料的潜在挑战和机遇。本文讨论了LPBFed AlCoCrFeNi2.1在大温度范围内退火后的微观结构演变及其对拉伸性能的影响。微观结构观察表明,在500℃退火后,B2片层内出现明显的spinodal分解,Cr的成分出现明显的波动。在600℃退火后,BCC纳米颗粒通过在调制的纳米结构中富Cr区域的结构紊乱而析出。拉伸试验和强化模型表明,退火诱导的硬化响应主要与L12纳米相的有序强化、BCC纳米相的相干性和模量强化引起的析出强化以及调制纳米结构引起的spinodal硬化有关。值得注意的是,BCC析出强化在提高退火合金的强度方面起着至关重要的作用。600℃时,BCC和L12纳米相的析出强化作用较强,而650℃时,BCC析出的强化作用随着溶解逐渐减弱,导致异常硬化行为。在较高温度(700 ~ 1000℃)退火后,依次发生相分解、析出溶解、甚至再结晶,导致不同程度的软化行为。


ROS-scavenging bioactive scaffold orchestrates bone regeneration for osteoporotic bone defect repair

Xiao Liang, Xindi Yang, Jing Liu, Lingfeng Tu, Wenxiang Wei, Hanjian Wang, Minhao Wu, Lin Cai, Yong Zheng, Yun Chen

doi:10.1016/j.compositesb.2024.111528

活性氧清除生物活性支架组织骨再生用于骨质疏松性骨缺损修复

The repair of osteoporotic bone defects, particularly those with irregular shapes, remains a significant challenge due to insufficient bone regeneration and an abnormal level of reactive oxygen species (ROS), which impairs the balance of bone remodeling. Materials that intrinsically regulate ROS to rebalance the activation of osteoblasts and osteoclasts represent a highly desirable alternative to current grafting strategies for the management of osteoporotic defects. Inspired by the tea polyphenols and natural extracellular matrix of bone tissue, a novel biomimetic composite scaffold, the epichlorohydrin-crosslinked hydroxyethyl cellulose/soy protein isolate/polydopamine-coated hydroxyapatite composite sponge (EHSS/PHA) scaffold was designed to orchestrate bone-forming bone marrow mesenchymal stem cells (BMSCs) and bone-resorbing osteoclasts for the rejuvenation of osteoporotic bone defect repair. Benefiting from the distinctive capabilities of the EHSS/PHA, including scavenging active oxygen and osteoinduction, we found that the EHSS/PHA could inhibit the formation of osteoclasts and promote osteogenesis of BMSCs by up-regulating the ratio of Opg/Rankl and activating the β-catenin signaling pathway in an oxidative stress environment. With its antioxidant ability, osteogenic, and self-deploying capability, EHSS/PHA effectively promoted the repair of tibial defects in osteoporotic rats by removing excess reactive oxygen species at the defect site. Taken together, this work presents the EHSS/PHA with multifunctional properties that provide new insight into osteoporotic bone defects.

由于骨再生不足和活性氧(ROS)水平异常,破坏了骨重塑的平衡,骨质疏松性骨缺损的修复,特别是那些不规则形状的骨缺损的修复仍然是一个重大挑战。从本质上调节活性氧以重新平衡成骨细胞和破骨细胞的激活的材料是目前治疗骨质疏松症缺陷的移植策略的一个非常理想的选择。受茶多酚和骨组织的天然细胞外基质的启发,设计了一种新型仿生复合支架,环氧氯丙烷交联羟乙基纤维素/大豆分离蛋白/聚多巴胺包被羟基磷灰石复合海绵(EHSS/PHA)支架,用于协调骨形成骨髓间充质干细胞(BMSCs)和骨吸收破骨细胞,以恢复骨质疏松性骨缺损修复。由于EHSS/PHA具有清除活性氧和诱导成骨的独特能力,我们发现EHSS/PHA在氧化应激环境下可以通过上调Opg/Rankl的比例和激活β-catenin信号通路,抑制破骨细胞的形成,促进骨髓间充质干细胞成骨。EHSS/PHA具有抗氧化能力、成骨能力和自展能力,通过清除缺损部位多余的活性氧,有效促进骨质疏松大鼠胫骨缺损的修复。综上所述,这项工作提出EHSS/PHA具有多功能特性,为骨质疏松性骨缺陷提供了新的见解。


Composites Science and Technology

EXPLICIT MODELLING OF MESO-SCALE DAMAGE IN LAMINATED COMPOSITES – COMPARISON BETWEEN FINITE FRACTURE MECHANICS AND COHESIVE ZONE MODEL

Jean Vereecke, Christophe Bois, Jean-Christophe Wahl, Tanguy Briand, Ludovic Ballère, Florian Lavelle

doi:10.1016/j.compscitech.2024.110640

 

层合复合材料细观损伤的显式建模——有限断裂力学与黏结区模型的比较

The ability of carbon fibre reinforced polymers to respect functional requirements such as permeability is strongly related to their damage state. In order to identify the fracture properties on which transverse cracking kinetics depend, we combine experimental and virtual tests by explicitly modelling all transverse cracks. Two modelling methods are compared, the cohesive zone model (CZM) and finite fracture mechanics (FFM). Both models are based on a double criterion of energy and strength. Each potential crack is assigned a couple of material properties (fracture energy and strength) derived from a probability distribution. This study focuses on how modelling choice implies assumptions on energy dissipation and the cracking behaviour represented. The relevance of both modelling methods is also discussed. A methodology is provided for identifying fracture properties and predicting damage accumulation in an isolated ply.

碳纤维增强聚合物满足功能要求的能力,如渗透性,与它们的损伤状态密切相关。为了确定横向裂纹动力学所依赖的断裂特性,我们通过明确模拟所有横向裂纹,将实验和虚拟测试结合起来。比较了两种建模方法,即黏聚区模型(CZM)和有限断裂力学(FFM)。这两种模型都基于能量和强度的双重标准。每个潜在的裂纹都被赋予了由概率分布得出的几个材料特性(断裂能和强度)。本研究的重点是如何建模选择暗示对能量耗散和开裂行为的假设。本文还讨论了两种建模方法的相关性。提供了一种识别裂缝性质和预测隔离层中损伤累积的方法。


来源:复合材料力学仿真Composites FEM
ACTMechanicalInspireDeformGENESIS振动断裂复合材料航天裂纹理论材料仿生控制试验
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【新文速递】2024年5月7日固体力学SCI期刊最新文章

今日更新:International Journal of Solids and Structures 1 篇,Journal of the Mechanics and Physics of Solids 1 篇,Mechanics of Materials 1 篇,International Journal of Plasticity 3 篇,Thin-Walled Structures 2 篇International Journal of Solids and StructuresOrigin of bent ridge-kink based on disclination relaxationXueyu Zhang, Ryutaro Matsumura, Yuri Shinohara, Tomonari Inamuradoi:10.1016/j.ijsolstr.2024.112829 基于偏斜松弛的弯曲脊扭成因In this study, we have developed a geometric model for bent kinks by introducing sequences of ortho-connected kink bands into ridge-kinks to provide insights into the possible reasons why kinks are bent and the resulting geometry when they are bent. We first formulated the Frank angles and coordinates of the disclinations formed in the bent kinks, which enable our discussion on the influence of the introduction of ortho-kinks on the Gibbs energy by utilizing Romanov’s disclination model. It turns out that the introduction of ortho-kinks can relax the elastic strain energy and thus reduce the Gibbs energy of the system under compression states with lower external stresses. On the other hand, the introduction of ortho-kinks increases the Gibbs energy at higher compression stresses, implying sharp ridge-kinks are preferred under such conditions. This trend resembles the experimental observations reported by previous studies that the shapes of newly formed kinks tend to transition from pre-kinks with bent shapes to ridge-kinks with sharp shapes as the compression test progresses. The smoothly bent kink with smoothly distributed misorientation, formed by increasing the number of introduced ortho-kinks, can further reduce the Gibbs energy at lower applied stresses. Subsequently, based on the Rank-1 condition for the connection of kink bands, we further analyzed the geometry of such smoothly bent kinks and derived the analytical equations for the constraints on the orientation distribution. Finally, we conducted EBSD measurements on bent kinks observed in directionally solidified (DS) LPSO-Mg alloys and confirmed that the derived equations for the orientation distribution are in good agreement with the experimental results.在这项研究中,我们通过将正交连接的扭结带序列引入脊状扭结中,开发了弯曲扭结的几何模型,以深入了解扭结弯曲的可能原因以及弯曲时产生的几何形状。我们首先给出了弯曲扭结中形成的斜折的Frank角和坐标,这使得我们能够利用罗曼诺夫的斜折模型讨论正扭结的引入对吉布斯能量的影响。结果表明,正交扭结的引入可以使体系的弹性应变能松弛,从而降低体系在低外应力压缩状态下的吉布斯能。另一方面,在较高的压缩应力下,正扭结的引入增加了吉布斯能,这意味着在这种条件下,尖锐的脊状扭结是首选的。这一趋势与以往研究报告的实验观察结果相似,即随着压缩试验的进行,新形成的扭结的形状倾向于从弯曲形状的预扭结转变为尖锐形状的脊状扭结。在较低的外加应力下,通过增加引入的正扭结的数量,形成具有平滑分布的错取向的平滑弯曲扭结,可以进一步降低吉布斯能。随后,基于扭结带连接的Rank-1条件,进一步分析了这种光滑弯曲扭结的几何形状,并推导了其方向分布约束的解析方程。最后,我们对定向凝固(DS) LPSO-Mg合金中观察到的弯曲扭结进行了EBSD测量,证实了取向分布的推导方程与实验结果吻合较好。Journal of the Mechanics and Physics of SolidsQuantized Impact of Rod on PlateQing Peng, Xiaoming Liu, Yue-Guang Weidoi:10.1016/j.jmps.2024.105680 量化杆对板的影响In this work, we attacked the problem of elastic impact of a rod on a plate. By considering wave propagation on the plate and along the rod, we established a mathematic model with delay differential equation that governs such impact. The proposed model could consolidate classical impact problems from bead-on-wall, bead-on-plate, to rod-on-wall impact. Solving the governing equation, we obtained a universal loading and unloading history of such impact: the unloading history exhibits quantized plateaus, the values of which are quantitatively provided in the present study. Also, the contact duration also shows a band structure while tuning the compliance of plate. In addition, we analyzed the overshoots leading the plateaus during unloading, which cause the final detachment between the rod and the plate.在这项工作中,我们研究了杆对板的弹性冲击问题。考虑波在板上和杆上的传播,建立了控制这种影响的时滞微分方程数学模型。所提出的模型可以将经典的碰撞问题从头对壁、头对板到杆对壁进行整合。通过求解控制方程,我们得到了这种冲击的普遍加载和卸载历史:卸载历史表现为量化的平台,本研究定量地提供了其值。同时,在调整板的柔度时,接触时间也呈现带状结构。此外,我们分析了在卸载过程中导致平台的超调,这导致杆与板之间的最终脱离。Mechanics of MaterialsPredicting plastic behavior of magnesium alloy tube bending with comprehensive constitutive modelsHan-Xu Zhang, Fei-Fan Li, Gang Fangdoi:10.1016/j.mechmat.2024.105030 用综合本构模型预测镁合金管材弯曲塑性行为This paper aims to predict defects occurring in magnesium alloy tube bending through finite element simulations. Deformation tests were conducted to identify and characterize plastic anisotropy, tension-compression asymmetry, and differential hardening behaviors of extruded Mg–Al–Zn-RE alloy rectangular tubes. Limited by size, the deformation tests along the wall thickness of specimens are conducted through crystal plasticity analysis. To thoroughly investigate the material constitutive features affecting bending, two constitutive models, Yoon2014 and Hill48, are established and calibrated. The non-associative flow rule is adopted, and differential hardening is depicted using the yield-surface interpolation method. In comparison, the Yoon2014 model accurately predicts the strain distribution and tube shape collapse of the bent tube with negligible deviation from the experimental data, prior to the Hill48 model. This underscores the necessity of considering comprehensive plasticity models in tube bending simulations.本文旨在通过有限元模拟对镁合金管材弯曲过程中出现的缺陷进行预测。通过变形试验确定和表征挤压Mg-Al-Zn-RE合金矩形管的塑性各向异性、拉压不对称性和不同硬化行为。受尺寸限制,沿试样壁厚方向的变形试验采用晶体塑性分析方法进行。为了深入研究影响弯曲的材料本构特征,建立并校准了Yoon2014和Hill48两个本构模型。采用非关联流动规律,采用屈服面插值法描述微分硬化。相比之下,Yoon2014模型较Hill48模型更准确地预测了弯曲管的应变分布和管形坍塌,与实验数据的偏差可以忽略不计。这强调了在管材弯曲模拟中考虑综合塑性模型的必要性。International Journal of PlasticityOrientation-dependent deformation mechanisms of alpha-uranium single crystals under shock compressionYongfeng Huang, Pan Li, Songlin Yao, Kun Wang, Wangyu Hudoi:10.1016/j.ijplas.2024.103991激波压缩下α -铀单晶取向依赖性变形机制Large-scale non-equilibrium molecular dynamics (NEMD) simulations were employed to investigate the dynamic deformations of alpha-uranium (α-U) single crystals subjected to varying shock strengths along low-index crystallographic orientations. The pronounced anisotropy of α-U gives rise to a complex microstructural evolution under shock loading. In-depth microstructural analysis of post-shock specimens reveals the identification of multiple dynamic deformation mechanisms. Notably, when the shock loading direction aligns with the a-axis, dynamic deformation of the α-U single crystals is primarily dominated by lattice instability, which attributes to a crystalline-to-amorphous transition serving as the dominant shear stress relaxation pathway. On the other hand, shock loading along the b-axis results in an abundance of deformation twins, with twinning planes identified as (130) and (13¯0). During the twinning event, the α-U matrix undergoes a transition to a metastable intermediate phase, subsequently decomposing into a composite structure comprising α-U twins and matrix. This unconventional twinning mechanism significantly deviates from classical theories. Furthermore, upon loading along the c-axis, twinning and a phase transition from α-U to body-centered tetragonal phase (bct-U) occur in α-U single crystal samples. Given that the pressure threshold of this phase transition predicted by ab initio calculations is as high as ∼270 GPa, the phase transition from α-U to bct-U might be implausible. An alternative interatomic potential of uranium with the higher pressure threshold was employed to reinvestigate the shock response of α-U single crystals along the c-axis. The phase transition of α-U to bct-U disappears, and twinning dominates the plastic deformation, with the twinning orientation conforming to the {112} twinning. The strong anisotropy of the α-U lattice triggers a wealth of orientation-dependent dynamic deformation mechanisms. The activation of the twinning system is evidently associated with the loading direction, constituting the potential cause for the discovery of multiple twinning variants during the deformation in polycrystalline uranium.采用大规模非平衡分子动力学(NEMD)模拟研究了α-铀(α-U)单晶体在不同冲击强度下沿低指数晶体学取向的动态变形。α-U具有明显的各向异性,因此在冲击加载下会产生复杂的微观结构演变。通过对冲击后试样进行深入的微观结构分析,发现了多种动态变形机制。值得注意的是,当冲击加载方向与 a 轴一致时,α-U 单晶的动态变形主要由晶格不稳定性主导,这就导致晶体到非晶体的转变成为剪应力松弛的主要途径。另一方面,沿 b 轴的冲击加载导致了大量的变形孪晶,孪晶平面被识别为 (130) 和 (13¯0)。在孪生过程中,α-U 基体过渡到一个可蜕变的中间相,随后分解为由α-U孪晶和基体组成的复合结构。这种非传统的孪生机制大大偏离了经典理论。此外,在沿 c 轴加载时,α-U 单晶样品中会出现孪晶,并发生从α-U 到体心四方相(bct-U)的相变。鉴于根据原子序数计算预测的这种相变的压力阈值高达 ∼270 GPa,从 α-U 到 bct-U 的相变可能是难以置信的。我们采用了另一种具有更高压力阈值的铀原子间势来重新研究 α-U 单晶沿 c 轴的冲击响应。α-U到bct-U的相变消失了,孪晶主导了塑性变形,孪晶取向符合{112}孪晶。α-U晶格的强各向异性引发了大量取向相关的动态变形机制。孪晶系统的激活显然与加载方向有关,这也是在多晶铀变形过程中发现多种孪晶变体的潜在原因。Spatially-resolved cluster dynamics modeling of irradiation growthMatthew Maron, Yang Li, Inam Lalani, Kristopher Baker, Benjamin Ramirez Flores, Thomas Black, James Hollenbeck, Nasr Ghoniem, Giacomo Podoi:10.1016/j.ijplas.2024.103989辐射生长的空间分辨簇动力学模拟We develop here a spatially resolved, three-dimensional continuum model coupling cluster dynamics (SR-CD) and crystal plasticity to investigate irradiation growth in zirconium. The model uses scale separation to divide the population of the irradiation cluster into mobile and immobile families. Small interstitial and vacancy clusters are modeled using anisotropic reaction–diffusion. Among the immobile clusters, an atomistically-informed vacancy cluster to vacancy loop transition is taken into account. The coupling between the evolution equation of CD and the plastic deformation of the material is two-fold, with stress-informed bias factors and local inelastic strains computed from the evolution of the evolving cluster population. The numerical implementation of the model utilizes the finite element method to analyze both single-crystal and polycrystalline samples. The growth strains that are computed align well with the experimental data provided by Carpenter for single-crystal Zr. Furthermore, the transformation of a vacancy cluster into a complete vacancy loop, occurring at a size of 14 nm, is in agreement with experimental observations and atomistic simulations. The density, size, and growth rate of the dislocation loops, denoted as〈c〉and 〈a〉, also exhibit good agreement with transmission electron microscopy (TEM) analysis of irradiated Zr and its alloys. Our findings demonstrate there is a spatial correlation of the growth of these dislocation loops and growth strains are significantly influenced by crystal size. To explain the expansion of the 〈a〉 axis and the contraction of the 〈c〉 axis in irradiated Zr, it is necessary to consider the diffusion anisotropy difference (DAD) of mobile interstitial species. We have shown that the PWR Kearns parameters, specifically fr = 0.63, ft = 0.32, fa = 0.05, confer enhanced irradiation resistance to Zr along the principal directions when compared to single crystals. Additionally, reducing the grain size to nanograins further enhances the resistance to irradiation-induced growth, particularly along the direction with the highest volume fraction of basal poles [0001].我们在此建立了一个空间分辨的三维连续模型,该模型将团簇动力学(SR-CD)和晶体塑性耦合在一起,用于研究锆的辐照生长。该模型利用尺度分离将辐照簇群划分为移动和不移动家族。小的间隙簇和空位簇采用各向异性反应扩散模型。在不动簇中,考虑了原子信息空位簇到空位环的转变。CD 演化方程与材料塑性变形之间的耦合是双重的,应力偏置因子和局部非弹性应变是通过不断演化的团簇群体的演化计算得出的。该模型的数值实现采用了有限元方法,以分析单晶和多晶样品。计算出的生长应变与 Carpenter 提供的单晶锆的实验数据非常吻合。此外,一个空位簇转变为一个完整的空位环(大小为 14 纳米)与实验观察和原子模拟结果一致。以〈c〉和〈a〉表示的位错环的密度、尺寸和生长率也与辐照锆及其合金的透射电子显微镜(TEM)分析结果十分吻合。我们的研究结果表明,这些位错环的生长存在空间相关性,生长应变受到晶体尺寸的显著影响。要解释辐照锆中〈a〉轴的扩展和〈c〉轴的收缩,有必要考虑移动间隙物种的扩散各向异性差(DAD)。我们的研究表明,与单晶体相比,PWR Kearns 参数(特别是 fr = 0.63、ft = 0.32、fa = 0.05)可增强锆沿主要方向的抗辐照能力。此外,将晶粒尺寸减小到纳米晶粒可进一步增强抗辐照诱导生长的能力,尤其是沿基极体积分数最高的方向[0001]。Effect of Ni4Ti3 precipitates on the functional properties of NiTi shape memory alloys: A phase field studyBo Xu, Yuanzun Sun, Chao Yu, Jiachen Hu, Jiaming Zhu, Junyuan Xiong, Qianhua Kan, Chong Wang, Qingyuan Wang, Guozheng Kangdoi:10.1016/j.ijplas.2024.103993Ni4Ti3析出物对NiTi形状记忆合金功能性能影响的相场研究Ni4Ti3 precipitates, which generally exist in aged Ni-rich NiTi shape memory alloys (SMAs), can have a profound effect on material properties. However, the fundamental insights into the effects of Ni4Ti3 precipitates on the functional properties, including the superelasticity (SE), elastocaloric effect (eCE), and shape memory effects (SMEs), are not well understood yet, especially those originating from the B2-B19′ martensite transformation (MT). In this work, a phase field model coupling the precipitation of Ni4Ti3 and the B2-B19′ MT is proposed, where the thermo-mechanical coupling effect and grain size effect are considered. The precipitate-dependent SE, eCE, one-way SME (OWSME), and stress-assisted two-way SME (SATWSME) of single-crystal, polycrystalline, and gradient-nanograined NiTi SMAs are simulated. The effects of the precipitate density, grain orientation range (texture), and gradient-distributed precipitate are examined, and the underlying microscopic mechanisms are revealed. The simulation results and new findings not only contribute to a more comprehensive insight into the effect of Ni4Ti3 precipitates on the MT, martensite reorientation, and functional properties of NiTi SMAs but also provide a reference for the development of excellent SMA-based solid refrigerants or SMA smart materials with designable functional properties.Ni4Ti3析出物普遍存在于时效富镍NiTi形状记忆合金中,对材料性能有着深远的影响。然而,Ni4Ti3析出物对功能性能的影响,包括超弹性(SE)、弹性热效应(eCE)和形状记忆效应(SMEs),特别是那些源自B2-B19′马氏体相变(MT)的影响,尚未得到很好的理解。本文建立了考虑热-机械耦合效应和晶粒尺寸效应的Ni4Ti3与B2-B19′MT相场耦合模型。模拟了单晶、多晶和梯度纳米NiTi sma的沉淀依赖SE、eCE、单向SME (OWSME)和应力辅助双向SME (SATWSME)。考察了析出相密度、晶粒取向范围(织构)和梯度分布的影响,揭示了其微观机制。模拟结果和新发现不仅有助于更全面地了解Ni4Ti3沉淀对NiTi SMA的MT、马氏体重取向和功能性能的影响,而且为开发具有可设计功能性能的优异SMA固体制冷剂或SMA智能材料提供参考。Thin-Walled StructuresLow temperature effect on cyclic behavior of shape memory alloy U-shaped dampersJiahao Huang, Zhipeng Chen, Songye Zhudoi:10.1016/j.tws.2024.111962低温对形状记忆合金u型阻尼器循环性能的影响Although Nickel-Titanium (NiTi) shape memory alloys (SMAs) have been widely studied as seismic response mitigation devices in civil structures, their temperature sensitivity due to the coupled thermo-mechanical behavior prevents their practical implementation in cold temperature environments. This paper investigated the effects of varying ambient temperatures (particularly low ambient temperature) on the hysteretic behavior and self-centering (SC) ability of shape memory alloy U-shaped dampers (SMAUDs) that were made of NiTi showing superelasticity (SE) at room temperature. Thermo-mechanical properties of SMAUDs were identified through differential scanning calorimetry (DSC) tests. Cyclic loading experiments on SMAUDs were conducted at a wide ambient temperature range from −40°C to 20°C. The variations in the hysteretic characteristics of the SMAUD, including partial superelasticity (SE), strength, stiffness, SC, and energy dissipation capabilities, at different ambient temperatures were investigated. In general, the decreasing ambient temperature leads to the degradation of the SC ability. At ambient temperatures below the phase transformation temperature, the SMAUDs lose the SE but still maintain certain levels of strength and energy dissipation, which is different from common axial-type SMA elements. Meanwhile, the SMAUDs can restore their SC ability and strength after the recovery from low temperatures to room temperature, making them suitable for use in a cold environment.尽管镍钛(NiTi)形状记忆合金(SMAs)作为土木结构中的地震反应缓解装置已经得到了广泛的研究,但由于热-力耦合行为导致的温度敏感性阻碍了它们在低温环境中的实际应用。研究了室温下不同环境温度(特别是低温)对具有超弹性的NiTi形状记忆合金u型阻尼器(SMAUDs)滞回性能和自定心(SC)能力的影响。通过差示扫描量热法(DSC)测试鉴定了SMAUDs的热力学性能。SMAUDs的循环加载实验在- 40℃~ 20℃的宽环境温度范围内进行。研究了不同环境温度下SMAUD的滞回特性,包括部分超弹性(SE)、强度、刚度、SC和耗能能力的变化。一般来说,环境温度的降低会导致SC能力的下降。在低于相变温度的环境温度下,smaud失去了SE,但仍保持一定水平的强度和能量耗散,这与普通轴向型SMA元件不同。同时,smaud从低温恢复到室温后,可以恢复其SC能力和强度,适合在寒冷环境中使用。Effect of bondline thickness on the mechanical performance of CFRP laminate with asymmetric damage repaired by double-sided adhesive patchXiao Han, Daoxin Li, Liangliang Sun, Dezhi Wang, Jiewang Xu, Wei Zhangdoi:10.1016/j.tws.2024.111976粘结线厚度对双面胶贴修复不对称损伤CFRP复合材料力学性能的影响As a common CFRP repair method, double-sided adhesive patch has been widely used in the automotive and aeronautic industry. More specific research is thus needed to help better understanding the effect of repairing parameters on the mechanical performance of CFRP structures after patch bonding. In this paper, experimental and Finite Element Modelling (FEM) efforts were made on the adhesive repaired CFRP laminate with different bondline thicknesses. Artificial damage was prefabricated in the centre of the CFRP laminate, which was then repaired through double-sided adhesive patch. Quasi-static tensile tests were conducted on the repaired specimen up to failure, to obtain the load-displacement curves. With a bondline thickness of 0.5 mm, the repaired CFRP structure reached its maximum peak load, increased by 25.3% and 26.4% compared to 0.2 mm and 1.0 mm bondline thicknesses, respectively. SEM observations were used to analyse the influence of adhesive thickness on the fracture modes. Combined with Cohesive Zone Model (CZM) for the adhesive layer and Hashin damage criterion for the CFRP, the FE model of the CFRP laminate repaired with double-sided adhesive patch subjected to tensile loading was established. Finally, the damage evolution as well as the failure modes in the parent laminate and adhesive layer with different bondline thicknesses were compared and analysed. It was revealed that bondline thickness can effectively affect the mechanical performance of CFRP laminate after adhesive patch repair.双面粘接贴片作为一种常用的CFRP修补方法,在汽车和航空工业中得到了广泛的应用。因此,需要更具体的研究来帮助更好地了解修复参数对贴片粘合后CFRP结构力学性能的影响。本文对不同粘结线厚度的CFRP粘接修复层合板进行了实验和有限元模拟研究。在CFRP层压板的中心预制人工损伤,然后通过双面胶贴修复。对修复试件进行了破坏前的准静态拉伸试验,得到了试件的载荷-位移曲线。修复后的CFRP结构在粘结线厚度为0.5 mm时达到最大峰值载荷,比粘结线厚度为0.2 mm和1.0 mm时分别增加了25.3%和26.4%。利用扫描电镜分析了胶粘剂厚度对断裂模式的影响。结合粘接层的内聚区模型(CZM)和CFRP的哈辛损伤准则,建立了双面粘接修补CFRP层合板在拉伸载荷作用下的有限元模型。最后,对不同粘结线厚度的母层和粘结层的损伤演化及破坏模式进行了比较分析。结果表明,粘结线厚度对贴片修复后CFRP复合材料的力学性能有显著影响。来源:复合材料力学仿真Composites FEM

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