【新文速递】2024年8月9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 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 2 篇

International J ournal of Solids and Structures

An indentation method to determine the constitutive parameters of hyperelastic films under large deformation: Theoretical model, experiments and simulations

Haoyuan Che, Martine Ben Amar, Wei Zhu, Shengjun Fan, Jinsong Leng, Fei Jia, Yanju Liu

doi:10.1016/j.ijsolstr.2024.113007

一种确定大变形下超弹性薄膜本构参数的压痕方法:理论模型、实验与仿真

The characterization of the mechanical properties of soft films is of great importance for their applications. In our previous research, we demonstrate the existence of a maximum load occurring during the indentation process of a perforated film by a spherical indenter. Based on this result, an approach to obtain the shear modulus of the film material using the method of finite element analysis has been proposed. However, our previous work does not consider the effect of friction between the film and the indenter, which has a significant influence on the value of the maximum load. Here, a theoretical model is presented which takes into account the role of friction. The reliability and accuracy of the theoretical model are validated by comparison with simulations and experimental results. In addition, the indenter eccentricity and round hole shape deviations which commonly occur in actual indentation tests, are investigated by combining indentation test measurements with finite element analysis. The performance of this method on porous films is also analyzed experimentally and numerically. The results reveal that this indentation method is still effective for porous films. This work provides a fundamental understanding of the mechanism of the indentation method and is expected to provide a new perspective for local characterization of films, even with multiple holes.

软膜力学性能的表征对其应用具有重要意义。在我们之前的研究中，我们证明了球形压头在穿孔膜压痕过程中存在最大载荷。在此基础上，提出了一种利用有限元分析方法求得薄膜材料剪切模量的方法。然而，我们之前的工作没有考虑薄膜和压头之间的摩擦的影响，这对最大载荷的值有很大的影响。在这里，提出了一个考虑摩擦作用的理论模型。通过与仿真和实验结果的比较，验证了理论模型的可靠性和准确性。此外，将压痕试验测量结果与有限元分析相结合，对实际压痕试验中常见的压痕偏心和圆孔形状偏差进行了研究。实验和数值分析了该方法在多孔膜上的性能。结果表明，这种压痕方法对多孔膜仍然是有效的。这项工作提供了对压痕方法机制的基本理解，并有望为具有多个孔的薄膜的局部表征提供新的视角。

International Journal of Plasticity

3D microstructure-based modelling of ductile damage at large plastic strains in an aluminum sheet

Abhishek Sarmah, Shahryar Asqardoust, Mukesh K Jain, Hui Yuan

doi:10.1016/j.ijplas.2024.104088

基于三维微观结构的大塑性应变下铝板韧性损伤模型

Damage initiation in high-strength aluminum alloys with a precipitate-rich matrix is typically particle-driven. In AA7075-O temper, particle cracking and decohesion are the primary void nucleation mechanisms. However, the impact of particle-induced voiding on subsequent void growth and coalescence remains inadequately understood. Given that void growth and coalescence are inherently three-dimensional (3D) phenomena, conventional two-dimensional microstructure-based numerical models fail to accurately capture these damage evolution processes. The current work investigates void growth and coalescence phenomena in AA7075-O by developing 3D finite element (FE) real microstructure based models, created from plasma focused ion beam-scanning electron (PFIB-SEM) tomography and 3D electron back scattered diffraction (3D-EBSD). The models incorporate three key damage processes: particle cracking, particle decohesion, and matrix damage, to examine their effects on void growth and coalescence behavior in AA7075-O. Additionally, the influence of aluminum matrix grains on damage evolution in AA7075-O is explored. Complementary multi-scale modeling tools, along with in-situ scanning electron microscopy (SEM) and in-situ micro-X-ray computed tomography (μXCT), were employed for validation and supplementary insights. It is shown that 3D RVEs can capture the general 3D experimental trends in plastic heterogeneity and damage development at the microstructural length scale. Also, void growth and coalescence is influenced by the local stress fields, which in turn is dictated by particle morphology, particle cracking and decohesion. Particle cracking can accelerate the final specimen fracture, while particle decohesion promotes void growth but delays final coalescence. Void coalescence is shown to occur through void sheeting mechanism while the influence of grain characteristics on ductile void damage progression is found to be relatively limited.

在富含析出物的高强度铝合金中，损伤的起裂通常是由颗粒驱动的。在AA7075-O回火中，颗粒开裂和脱聚是主要的空穴形核机制。然而，颗粒诱导的空穴对随后的空穴生长和合并的影响仍然没有得到充分的了解。由于空洞生长和聚并是固有的三维(3D)现象，传统的基于二维微观结构的数值模型无法准确捕捉这些损伤演化过程。目前的工作是通过建立基于等离子体聚焦离子束扫描电子(PFIB-SEM)断层扫描和3D电子背散射衍射(3D- ebsd)的三维有限元(FE)真实微观结构模型来研究AA7075-O中的空洞生长和聚并现象。该模型包括三个关键损伤过程:颗粒开裂、颗粒脱黏和基体损伤，以研究它们对AA7075-O中空洞生长和聚结行为的影响。此外，还探讨了铝基晶粒对AA7075-O损伤演化的影响。互补的多尺度建模工具，以及原位扫描电子显微镜(SEM)和原位微x射线计算机断层扫描(μXCT)，用于验证和补充见解。结果表明，三维RVEs可以在微观结构长度尺度上捕捉塑性非均质性和损伤发展的一般三维实验趋势。此外，孔隙的生长和聚并受局部应力场的影响，而局部应力场又受颗粒形态、颗粒开裂和脱黏的影响。颗粒开裂可加速试样的最终断裂，而颗粒脱黏可促进空洞的生长，但会延迟试样的最终聚并。孔洞聚并是通过孔洞片化机制发生的，而晶粒特征对塑性孔洞损伤进展的影响相对有限。

Thin-Walled Structures

Post-fire behavior and resistances of S890 ultra-high strength steel circular hollow section beam–columns

Jiahao Zhang, Hua Yang, Andi Su

doi:10.1016/j.tws.2024.112322

S890超高强度钢圆空心截面梁柱的火后性能及耐火性能

An experimental and numerical modeling program was carried out to investigate the post-fire structural behavior and residual resistances of S890 ultra-high strength steel (UHSS) circular hollow section (CHS) beam–columns after exposure to elevated temperatures and presented in this paper. Eighteen CHS beam–column specimens were tested, with heating, soaking and cooling of specimens, post-fire tensile coupon tests as well as measurements of initial global geometric imperfections firstly performed. Finite element (FE) models were developed and validated against the available experimental results, and then adopted for generating further numerical data covering a wider spectrum of member lengths, cross-sectional dimensions and loading combinations to expand the data pool. Owing to the absence of design provisions for steel structures after exposure to elevated temperatures, the relevant ambient temperature design interaction curves outlined in the current European, American and Australian specifications are evaluated for their applicability to S890 UHSS CHS beam–columns after exposure to elevated temperatures, with post-fire material properties used. The assessment results revealed that the codified provisions in the European, American and Australian specifications can lead to safe but slightly conservative resistance predictions for S890 UHSS CHS beam–columns after exposure to elevated temperatures, except for a few unsafe data points (for the elevated temperature of 800 °C) predicted by the Australian standard.

本文采用实验和数值模拟方法研究了S890超高强度钢(UHSS)圆空心截面(CHS)梁柱在高温下的火灾后结构行为和残余抗力。对18个CHS梁柱试件进行了试验，首先进行了试件的加热、浸泡和冷却、火灾后的张拉副试验以及初始全局几何缺陷测量。建立了有限元模型，并根据现有的实验结果进行了验证，然后采用有限元模型生成了涵盖更广泛的构件长度、截面尺寸和加载组合的进一步数值数据，以扩大数据池。由于钢结构在高温下的设计缺乏规定，我们评估了当前欧洲、美国和澳大利亚规范中概述的相关环境温度设计交互曲线对S890 UHSS CHS梁柱在高温下的适用性，并使用了火灾后的材料性能。评估结果显示，除了澳大利亚标准预测的一些不安全数据点(对于800°C的高温)外，欧洲、美国和澳大利亚规范中的法规规定可以导致S890 UHSS CHS梁柱暴露于高温后的安全但略保守的阻力预测。

Dynamic analysis of stepped functionally graded conical shells with general boundary restraints using Jacobi polynomials-Ritz method

Lin Lu, Cong Gao, Jiawei Xu, Haichao Li, Jiajun Zheng

doi:10.1016/j.tws.2024.112304

用Jacobi多项式- ritz方法分析具有一般边界约束的阶梯功能梯度圆锥壳的动力

This study investigates the dynamic behaviors of stepped functionally graded conical shells under general boundary restraints. The properties of functionally graded material change continuously through the thickness in the framework of the general four parameter power-law distributions. A numerical analysis framework is formulated utilizing the Jacobi polynomials-Ritz method. The construction of the dynamic model incorporates the first-order shear deformation theory, domain decomposition approach and virtual spring method, with the introduction of the Jacobi orthogonal polynomials to delineate displacement functions. Through the Ritz method, both the free and forced vibrational behaviors of the structure are delineated. Moreover, the vibration response of the structure in time domain is ascertained utilizing the Newmark-β integral approach. This study offers a detailed examination of the influence exerted by factors including truncation number, and the Jacobi parameter on the convergence of the presented method. The veracity of the current approach is verified by juxtaposing its findings with those derived from the Finite Element Method and existing literatures. Additionally, the investigation explores the dynamic features of the stepped structure subject to different construction parameters, boundary restraints, and power-law distribution, as demonstrated through a comprehensive set of numerical examples.

研究了阶梯式功能梯度锥形壳在一般边界约束下的动力特性。在一般四参数幂律分布框架下，功能梯度材料的性能随厚度的变化而连续变化。利用雅可比多项式-里兹方法建立了数值分析框架。动力学模型的构建结合了一阶剪切变形理论、区域分解法和虚拟弹簧法，并引入了雅可比正交多项式来描述位移函数。通过Ritz方法，描述了结构的自由振动和强迫振动行为。此外，利用Newmark-β积分法确定了结构的时域振动响应。本文详细考察了截断数和Jacobi参数等因素对所提方法收敛性的影响。通过将现有方法的结果与有限元法和现有文献的结果并列验证了当前方法的准确性。此外，通过一组综合的数值算例，研究了不同施工参数、边界约束和幂律分布下阶梯结构的动力特性。

来源：复合材料力学仿真Composites FEM

【新文速递】2024年8月11日复合材料SCI期刊最新文章

今日更新：Composite Structures 2 篇，Composites Part B: Engineering 1 篇，Composites Science and Technology 1 篇Composite StructuresCompression behavior and energy dissipation of aluminum foam-polyurethane elastomer composite materials under impact loadingYoucai Xiao, Huiming Liu, Qin Fu, Chenyang Fan, Yu Zou, Yong Han, Yi Sundoi:10.1016/j.compstruct.2024.118477冲击载荷下泡沫铝-聚氨酯弹性体复合材料压缩性能及能量耗散Aluminum foam (AF) and polyurethane elastomer (PUE) are commonly utilized in the production of lightweight energy-absorbing components, owing to their exceptional energy absorbing properties and specific energy absorption. The dynamic mechanical properties of AF-PUE composite materials have been analyzed through experiments and simulation in this study. Meanwhile, the deformation pattern of AF-PUE under low impact loading is analyzed by utilizing neural network inverse identification and numerical simulation to determine the material parameters of AF. The results indicate that the stress–strain curve of AF-PUE during dynamic compression can be primarily divided into two stages: the initial stage, which is characterized by PUE compaction; the subsequent stage, which is marked by AF collapse and crushing. The interlayer fusion deformation mechanism of AF-PUE and the layer-by-layer and synchronous deformation mechanisms are elucidated by investigating the density, strain rate, and microporous structure and using digital image correlation (DIC). These findings are further validated using numerical simulation. The mesoscopic deformation mechanism of a composite comprising two layers of AF-PUE under high-velocity impact is also investigated. The results emphasize the importance of density arrangement in determining dynamic crushing behavior.泡沫铝(AF)和聚氨酯弹性体(PUE)由于其特殊的吸能性能和比能吸收，通常用于生产轻质吸能部件。本研究通过实验和模拟分析了AF-PUE复合材料的动态力学性能。同时，通过神经网络反识别和数值模拟，分析了AF-PUE在低冲击载荷作用下的变形规律，确定了AF-PUE的材料参数。结果表明，AF-PUE在动态压缩过程中的应力-应变曲线主要分为两个阶段:以PUE压实为特征的初始阶段;第二阶段，以心房塌陷和压碎为标志。通过对AF-PUE的密度、应变率、微孔结构和数字图像相关(DIC)技术的研究，阐明了AF-PUE的层间融合变形机制和逐层同步变形机制。数值模拟进一步验证了这些发现。研究了两层AF-PUE复合材料在高速冲击下的细观变形机理。结果强调了密度分布在决定动态破碎行为中的重要性。Multiscale homogenization of thermo-mechanical viscoelastic response of 3D orthogonal composites with time-dependent CTEsShuwei Huang, Yingying Qi, Junjie Zhang, Bohong Gu, Baozhong Sundoi:10.1016/j.compstruct.2024.118479三维正交复合材料热-机粘弹性响应的多尺度均匀化Viscoelastic behavior of the matrix affects the thermomechanical response of polymer composites. This study investigated the structural effects of the time-dependent thermal expansion response of 3D orthogonal woven composite (3DOWC) by combining experiments and finite element modeling (FEM), incorporating the viscoelasticity of its constituents. The deformation characteristics at three orthogonal cross-sections, in the presence of structure-related strain fields at various temperatures, were investigated using digital image correlation method. Findings reveal heterogeneity and localization of the thermal strain, characterized by periodic stripes with alternating high strain regions on the resin and low strain regions on the yarn. This localization intensifies at higher temperatures, but diminishes with increased distance from the interface. Furthermore, the composites exhibit time-dependent thermal expansion behavior derived from the time-independent thermal expansion of its constituents, which cannot be captured in classic elastic material model. FEM reveals that thermal stresses are concentrated at the interfaces between constituents with significant differences in their coefficients of thermal expansion (CTE), particularly at the interface between the resins and axial yarns. The maximum thermal stress occurs in the binder yarns over the considered temperature range due to their low volume content, which should be considered in practical applications.基体的粘弹性行为影响聚合物复合材料的热力学响应。采用实验与有限元模拟相结合的方法，研究了三维正交编织复合材料(3DOWC)热膨胀响应的结构效应，并考虑了其组成部分的粘弹性。采用数字图像相关方法研究了在不同温度下存在结构相关应变场的三个正交截面上的变形特征。结果表明，热应变具有非均匀性和局域性，其特征是树脂上的高应变区和纱线上的低应变区交替出现周期性条纹。这种局部化在较高温度下增强，但随着与界面距离的增加而减弱。此外，复合材料表现出与时间相关的热膨胀行为，这是由其成分的时间无关的热膨胀引起的，这在经典的弹性材料模型中是无法捕获的。有限元分析结果表明，热应力主要集中在热膨胀系数差异较大的组分之间的界面处，特别是树脂与轴向纱的界面处。在考虑的温度范围内，粘结纱由于体积含量低而产生最大的热应力，这在实际应用中应予以考虑。Composites Part B: EngineeringThin-shelled hollow mesoporous TiO2 spheres with less tortuosity as fast-charging anodeChang-Wan Hyeon, Boyeol Kim, Chan Woo Kim, Li Li, Chan-Yeup Chung, Sang-Eun Chundoi:10.1016/j.compositesb.2024.111760 具有较小扭曲度的薄壳中空介孔TiO2球作为快充阳极TiO2 is a stable and abundantly available material that is a promising alternative to graphite anodes. However, compact stacking of TiO6 octahedra induces repulsion between the inserted Li ions, reducing rate performance and achievable capacity. Herein, we propose mesoporous hollow TiO2 spheres composed of nanosized anatase to mitigate these issues. The hollow structure allows for ion transport both inward and outward. The empty-core material is obtained by depositing sub-20 nm TiO2 particles synthesized through the sol–gel process onto a carbon nanosphere support, followed by scaffold elimination. Thin TiO2 shells facilitate ion migration via a reduced tortuosity with minimizing isolated pore formation, allowing of 3.22×10-11 cm2 s-1 to be attained, which is 40 times higher than that of bulk-type TiO2. The facile Li-ion transport enables the insertion of 0.66 mol Li ions per mol of TiO2 at 0.5C and 67% rate performance (10C vs. 0.5C). The designed hollow TiO2 exhibits stable capacity retention of 85.9% for 1000 cycles at a fast charging rate of 20C. A full cell with a LiFePO4 cathode exhibits 60% rate capability (2000 vs. 50 mA g−1). Thin mesoporous hollow TiO2 facilitates the Li-ion transport and enable fast charging, confirming the potential of this anode for fast-charging applications.二氧化钛是一种稳定而丰富的材料，是一种有前途的石墨阳极替代品。然而，TiO6八面体的紧密堆叠会导致插入的Li离子之间的排斥，从而降低了速率性能和可实现的容量。在此，我们提出了由纳米锐钛矿组成的介孔空心TiO2球来缓解这些问题。中空结构允许离子向内和向外传输。空芯材料是通过将溶胶-凝胶法合成的低于20 nm的TiO2颗粒沉积在碳纳米球载体上，然后进行支架消除得到的。薄的TiO2壳层通过减少弯曲度和最小化孤立孔形成来促进离子迁移，允许达到3.22×10-11 cm2 s-1，这是体积型TiO2的40倍。在0.5C和67%的速率(10C vs. 0.5C)下，Li离子的传输速率为每mol TiO2插入0.66 mol Li离子。在20℃的快速充电速率下，TiO2在1000次循环下的容量保持率为85.9%。具有LiFePO4阴极的完整电池具有60%的倍率能力(2000 vs. 50 mA g−1)。薄介孔中空TiO2促进了锂离子的传输并实现了快速充电，证实了这种阳极在快速充电应用中的潜力。Composites Science and TechnologyConstructing Carbon nanotube (CNTs)/silica superhydrophobic coating with multi-stage rough structure for long-term anti-corrosion and low-temperature anti-icing in the marine environmentPengyuan Zhang, Yamei Zhao, Xiaoqi Gu, Kunde Yang, Xinglong Zhang, Mingyu Liu, Mengyang Zhao, Yuanjun Chedoi:10.1016/j.compscitech.2024.110798 构建多级粗糙结构碳纳米管/二氧化硅超疏水涂层，用于海洋环境中长期防腐和低温防冰The rough superhydrophobic surface is beneficial for capturing more gases underwater, which enhances corrosion and ice resistance for marine equipment. In this work, a PVAc-PVDF-FMCS (PPFMCS) multi-stage rough superhydrophobic coating was manufactured by a cold spraying method, significantly improving the anti-corrosion and anti-icing of aluminium alloy. The point-line structure was designed by cross-linking between multi-walled carbon nanotubes (MWCNTs) and silicon dioxide (SiO2), which facilitated the formation of multi-stage rough surface. The porous skeleton and interfacial adhesion of the PPFMCS coating were attributed to the introduction of polyvinylidenefluoride (PVDF) and polyvinylacetate (PVAc), respectively. The PPFMCS coating had good superhydrophobicity with a water contact angle of 163.5°, while exhibiting the outstanding performance of long-term anti-corrosion and anti-icing. The |Z|0.01 Hz value of the PPFMCS coating was still 9.62 × 109 Ω cm2 in 3.5 wt% NaCl solution for 35 days, only two orders of magnitude lower than that of the original coating, the equivalent circuits were further investigated and the metal protection is evaluated on the shore or in the deep ocean of the South China Sea. The PPFMCS coating was able to obviously delay icing for 5 min at -20°C, the ice adhesion of its surface was as low as 85.5 kPa. The icing phase transition was analyzed by a thermodynamic method. The coating also had good stability and drag reduction performance. This high-performance coating based on point-line structural design is expected to have practical applications in marine transportation, oil exploration and polar exploration.粗糙的超疏水表面有利于捕获更多的水下气体，从而提高海洋设备的耐腐蚀性和抗冰性。采用冷喷涂方法制备了PVAc-PVDF-FMCS (PPFMCS)多级超疏水粗糙涂层，显著提高了铝合金的抗腐蚀和抗结冰性能。通过多壁碳纳米管(MWCNTs)与二氧化硅(SiO2)的交联，设计了点线结构，促进了多段粗糙表面的形成。聚偏氟乙烯(PVDF)和聚醋酸乙烯(PVAc)的引入分别导致了PPFMCS涂层的多孔骨架和界面粘附。PPFMCS涂层具有良好的超疏水性，水接触角为163.5°，同时具有优异的长期防腐和防冰性能。在3.5 wt% NaCl溶液中，PPFMCS涂层的0.01 Hz值仍为9.62 × 109 Ω cm2，仅比原涂层降低了2个数量级，进一步研究了等效电路，并在南海海岸或深海中评价了金属防护效果。在-20℃条件下，PPFMCS涂层能明显延缓覆冰5 min，其表面的冰附力低至85.5 kPa。用热力学方法对结冰相变进行了分析。该涂层具有良好的稳定性和减阻性能。这种基于点线结构设计的高性能涂层有望在海洋运输、石油勘探和极地勘探中得到实际应用。来源：复合材料力学仿真Composites FEM