【新文速递】2024年8月27日复合材料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 2 篇，International Journal of Plasticity 2 篇，Thin-Walled Structures 2 篇International Journal of Solids and StructuresNonlinear thermoelastic buckling analysis of thin-walled structures using a reduced-order method with mixed nonlinear kinematicsKe Liang, Jiaqi Mu, Xiaobo Wangdoi:10.1016/j.ijsolstr.2024.112990基于混合非线性运动学的薄壁结构非线性热弹性屈曲分析The initial temperature field adds to the complexity of the geometrically nonlinear response, especially for the thin-walled structures in the presence of buckling. The conventional finite element method requires plenty of computational resources to solve the full-order finite element (FE) model using a Newton–Raphson incremental-iterative solution procedure. Although the reduced-order method inspired by the Koiter asymptotic theory remarkably decreases the number of degrees of freedom (DOFs) of the analysis model, the up to the fourth-order strain energy variations are still computationally prohibited when the fully nonlinear kinematics are adopted. In this work, a reduced-order method with the mixed nonlinear kinematics is proposed for nonlinear thermoelastic buckling analysis of thin-walled structures. The mixed kinematics are developed to simplify the high-order strain energy variations and involve the nonlinear thermoelastic effect. A reduced-order model is constructed using the mixed kinematics, in which the initial temperature field is converted to be an additional degree of freedom. The nonlinear thermoelastic response can be automatically traced using the predictor–corrector strategy based on the reduced FE system. The numerical examples, including flat plates and curved shells with various geometries and loadings, demonstrate the accuracy and high efficiency of the proposed method.初始温度场增加了几何非线性响应的复杂性，特别是对于存在屈曲的薄壁结构。传统的有限元方法采用牛顿-拉夫森增量迭代法求解全阶有限元模型，需要大量的计算资源。虽然受Koiter渐近理论启发的降阶方法显著降低了分析模型的自由度，但在采用完全非线性运动学时，计算上仍然禁止四阶应变能变化。本文提出了一种混合非线性运动学的薄壁结构非线性热弹性屈曲分析降阶方法。为了简化高阶应变能变化并考虑非线性热弹性效应，建立了混合运动学模型。利用混合运动学构造了一个降阶模型，将初始温度场转换为附加自由度。采用基于简化有限元系统的预测-校正策略可以自动跟踪非线性热弹性响应。通过各种几何形状和载荷的平板和弯曲壳的数值算例，验证了该方法的准确性和高效性。Journal of the Mechanics and Physics of SolidsUnstructured growth of irregular architectures for optimized metastructuresYingqi Jia, Ke Liu, Xiaojia Shelly Zhangdoi:10.1016/j.jmps.2024.105787优化元结构的不规则结构的非结构化增长Mechanical metastructures have been prevailing recently owing to their unusual mechanical responses. Despite notable progress in designing periodic metastructures, creating irregular and stochastic metastructures with optimized performance remains challenging due to the enlarged design space. In this study, we introduce a novel approach to realize the unstructured growth of irregular architectures for optimized metastructures. A “growth”-like design scheme is proposed to facilitate random yet controllable growth of predefined building blocks on an unstructured graph toward desired bulk properties. We also formulate a topology optimization framework that simultaneously optimizes building block selection and transformation (scaling, skew, and rotation) to generate metastructures with various optimized mechanical functionalities. These functionalities are achieved by harnessing the diverse homogenized material properties spanned by various frequency combinations of building blocks and the microstructure’s transformations. We discover metastructures that ensure geometric integrity and exhibit explicitly controllable and globally uniform feature sizes beneficial for manufacturing. Moreover, the transformation-based topology optimization makes these metastructures naturally conform to the boundaries of the design domain and serve as mechanical infills. The proposed approach holds promise for uncovering optimized metastructures applicable across a wide array of engineering applications.力学元结构由于其不同寻常的力学响应而在近年来得到广泛应用。尽管周期性元结构的设计取得了显著进展，但由于设计空间的扩大，创建具有优化性能的不规则和随机元结构仍然具有挑战性。在这项研究中，我们引入了一种新的方法来实现优化元结构的不规则结构的非结构化增长。提出了一种类似“增长”的设计方案，以促进预定义的构建块在非结构化图上随机但可控地向所需的批量属性增长。我们还制定了一个拓扑优化框架，同时优化构建块的选择和转换(缩放，倾斜和旋转)，以生成具有各种优化机械功能的元结构。这些功能是通过利用由构建块的各种频率组合和微观结构转换所跨越的各种均质材料特性来实现的。我们发现元结构，确保几何完整性，并表现出明确的可控和全局统一的特征尺寸有利于制造。此外，基于转换的拓扑优化使这些元结构自然地符合设计域的边界，并充当机械填充。所提出的方法有望揭示适用于各种工程应用的优化元结构。Mechanics of MaterialsMultiphysics topology optimization of magnetic materials with continuous magnetization orientationsZhi Zhao, Chao Wang, Xiaojia Shelly Zhangdoi:10.1016/j.mechmat.2024.105089连续磁化取向磁性材料的多物理场拓扑优化In recent years, magnetic-responsive soft materials have received significant attention due to their capacity for untethered and rapid actuation under magnetic fields, with diverse applications spanning robotics, biomedicine, and vibration mitigation. Most designs of magnetic soft materials rely on discrete magnetization orientations, which could limit the actuation performance because of the restricted selection of magnetization orientations and potentially cause fabrication challenges due to the sharp changes in magnetization orientations at the interfaces that may induce strong repelling forces. To expand the programmability and improve the fabricability of magnetic soft materials, we enable design capability with optimal continuous magnetization orientation. This paper proposes a multiphysics topology optimization framework that concurrently optimizes topologies and continuous remanent magnetization distributions in magnetic soft materials and structures. Employing the proposed approach, we design and investigate problems of letter programming, actuators, and metamaterials with magnetic actuation under large deformations. We demonstrate that the proposed strategy enhances design flexibility, improves performance, eliminates sharp changes in magnetization orientation, and is capable of creating non-intuitive designs that can achieve multiple functionalities. Finally, we prototype our optimized design to highlight its potential to bridge design optimization and direct ink writing fabrication of magnetic materials with optimally continuously varying magnetization.近年来，磁响应软材料因其在磁场下的不受约束和快速驱动能力而受到广泛关注，在机器人、生物医学和减振等领域有着广泛的应用。大多数磁性软材料的设计都依赖于离散的磁化取向，由于磁化取向的选择有限，这可能会限制驱动性能，并且由于界面处磁化取向的急剧变化可能引起强烈的排斥力，这可能会导致制造挑战。为了提高磁性软材料的可编程性和可制造性，我们使设计能力具有最佳的连续磁化方向。本文提出了一种多物理场拓扑优化框架，可同时优化磁性软材料和结构的拓扑结构和连续剩余磁化分布。采用所提出的方法，我们设计并研究了在大变形下具有磁致动的字母编程、致动器和超材料的问题。我们证明了所提出的策略增强了设计灵活性，提高了性能，消除了磁化方向的急剧变化，并且能够创建可以实现多种功能的非直观设计。最后，我们对优化设计进行了原型设计，以突出其在具有最佳连续变化磁化强度的磁性材料的设计优化和直接墨水书写制造之间的桥梁潜力。A modified constitutive model for whole-life thermal-mechanical fatigue incorporating dynamic strain aging in 316LN stainless steelBingbing Li, Chengcheng Li, Xu Chendoi:10.1016/j.mechmat.2024.105092考虑动态应变时效的316LN不锈钢全寿命热机械疲劳修正本构模型A comprehensive analysis of experimental data is presented for 316LN stainless steel subjected to isothermal and thermal-mechanical fatigue loading conditions within the temperature range of 350 to 600°C. The study aims to provide a thorough understanding of the cyclic behavior through meticulous data integration, supplementation, and the use of stress decomposition methods combined with a classical damage evolution definition. The modeling approach employed in this study is based on the classical AF-OW-Kang model, with the incorporation of the Arrhenius term in the plastic flow rate equation. Furthermore, to consider the effect of dynamic strain aging at varying temperatures, temperature-dependent terms are introduced into the equations that govern the evolution of isotropic stress and backstress, resulting in enhanced accuracy in describing cyclic hardening behavior. Additionally, a modified damage evolution equation is utilized, along with equations for isotropic stress and backstress evolution, to address cyclic softening. Simulation results confirm the effectiveness of the modified model in capturing the cyclic hardening/softening behavior of 316LN stainless steel throughout the whole-life time, under both isothermal and thermal-mechanical fatigue loading conditions.对316LN不锈钢在350 ~ 600℃的等温和热机械疲劳载荷条件下的实验数据进行了综合分析。该研究旨在通过细致的数据整合、补充以及结合经典损伤演化定义的应力分解方法的使用，提供对循环行为的透彻理解。本研究采用的建模方法基于经典的AF-OW-Kang模型，并在塑性流速方程中加入Arrhenius项。此外，为了考虑在不同温度下动态应变时效的影响，在控制各向同性应力和背应力演化的方程中引入了温度相关项，从而提高了描述循环硬化行为的准确性。此外，利用修正的损伤演化方程，以及各向同性应力和背应力演化方程来解决循环软化问题。仿真结果证实了修正模型在捕获316LN不锈钢在等温和热机械疲劳加载条件下的全寿命循环硬化/软化行为方面的有效性。International Journal of PlasticityThermodynamic modeling framework with experimental investigation of the large-scale bonded area and local void in Cu-Cu bonding interface for advanced semiconductor packagingSung-Hyun Oh, Hyun-Dong Lee, Jae-Uk Lee, Sung-Ho Park, Won-Seob Cho, Yong-Jin Park, Alexandra Haag, Soichi Watanabe, Marco Arnold, Hoo-Jeong Lee, Eun-Ho Leedoi:10.1016/j.ijplas.2024.104073先进半导体封装中Cu-Cu键合界面大面积键合区和局部空洞的热力学建模框架及实验研究With the increase in computational costs driven by the use of artificial intelligence, enhancing the performance of semiconductor systems while improving efficiency has become an inevitable challenge. Due to the fine pitch limits of micro bumps, bumpless Cu-Cu bonding is emerging as the next-generation core technology. This study aims to analyze the effects of individual temperature and pressure on both large- and local-scale behaviors of material in the Cu-Cu bonding process with experiments and numerical analysis. The motivation of this study is to compensate the deficiencies in reported studies on process optimization, particularly the lack of exploration of the separated effects of temperature and pressure on large- and local-scale Cu-Cu bonding. Furthermore, reports on the thermodynamic modeling of Cu-Cu bonding behavior are not sufficient, making it challenging to find suitable models. Bonding experiments were performed by independently controlling the temperature and pressure using blank Cu films treated by precise chemical mechanical polishing (CMP) processes. The large-scale bonded area under each condition was measured, and transmission electron microscope (TEM) images were captured to observe the patterns of local void formation under various temperature and pressure conditions. In the experiments, it was observed that the temperature increase had a greater impact on the bonded area at a larger scale than the increase in pressure. However, for nanoscale-local voids, an increase in pressure had a more dominant effect. To discuss the experimental results, a thermodynamic modeling framework that considers coupled heat-induced deformation, plastic deformation, and volumetric changes caused by material flux was proposed. The proposed model has been implemented in the user-defined material subroutine (UMAT) of the ABAQUS program for finite element (FE) analysis. Numerical analysis using the proposed model captures the experimental data well. In large-scale simulations, temperature conditions have a significant impact, with plastic deformation being the primary mode of deformation, while the pressure conditions dominate the material flux, making substantial contributions to reducing voids at local-scale. To achieve complete closure of the void, the simulation demonstrated that maintaining a sufficient pressure gradient until the complete closure is required. The study findings provide an explicit understanding of how the temperature and pressure conditions differently affect large-scale bonding and local voids for semiconductor package manufacturing.随着人工智能的应用驱动计算成本的增加，在提高效率的同时增强半导体系统的性能已成为一个不可避免的挑战。由于微凸点的间距限制，无凸点的Cu-Cu键合正成为下一代核心技术。本研究旨在通过实验和数值分析，分析单个温度和压力对Cu-Cu键合过程中材料大尺度和局部尺度行为的影响。本研究的动机是弥补已有研究在工艺优化方面的不足，特别是缺乏对温度和压力对大尺度和局部尺度Cu-Cu键合分离影响的探索。此外，关于Cu-Cu键合行为的热力学模型的报道并不充分，这给寻找合适的模型带来了挑战。采用精密化学机械抛光(CMP)工艺处理的空白Cu膜，通过独立控制温度和压力进行了键合实验。测量了不同温度和压力条件下的大尺度粘结面积，并通过透射电镜(TEM)观察了不同温度和压力条件下的局部孔隙形成模式。在实验中观察到，在更大的尺度上，温度的升高对键合面积的影响大于压力的升高。然而，对于纳米尺度的局部空洞，压力的增加具有更主要的影响。为了讨论实验结果，提出了一个考虑材料通量引起的热致变形、塑性变形和体积变化耦合的热力学建模框架。该模型已在ABAQUS有限元分析程序的用户自定义材料子程序(UMAT)中实现。采用该模型进行的数值分析较好地捕获了实验数据。在大尺度模拟中，温度条件具有显著的影响，塑性变形是主要的变形模式，而压力条件主导着材料通量，在局部尺度上对减少空隙做出了重大贡献。模拟表明，为了实现完全封闭，需要保持足够的压力梯度，直到完全封闭。研究结果提供了对温度和压力条件如何不同地影响半导体封装制造的大规模键合和局部空隙的明确理解。Multi-functional amorphous/crystalline interfaces rendering strong-and-ductile nano-metallic-glass/aluminum compositeYuyang Liu, Lei Zhao, Yixuan Hu, Ge Wang, Wangshu Zheng, Tim Vogel, Kolan M. Reddy, Yubin Ke, Qiang Guodoi:10.1016/j.ijplas.2024.104077 多功能非晶/晶体界面，使纳米金属-玻璃/铝复合材料具有强韧性Metal matrix composites (MMCs) are the materials-of-choice for a large range of important applications under harsh service conditions. However, owing to the high phase contrast between the matrix and the reinforcements, the strength-ductility conflict of MMCs is still outstanding. Here we fabricated a novel aluminum (Al) matrix composite reinforced by deformable, cobalt-zirconium-boron (CoZrB) metallic glass nanoparticles. The amorphous CoZrB/Al composite with only 2.0 vol.% particle reinforcements possessed a uniaxial tensile strength of 387.0±1.2 MPa, showing over 80% improvement over the unreinforced pure Al matrix at a similar uniform elongation. The strength-ductility synergy of the composite was also significantly superior to that of the composite reinforced by fully crystallized nanoparticles. These findings were rationalized by the unique multi-functionality of the amorphous particle/matrix interfaces, which effectively transferred the load from the matrix to the particles, coordinated the co-deformation of the nanoparticles and the matrix, and imparted a transgranular fracture mode in the composite with extensive matrix plastic deformation. The methodology developed in this study was shown to be generally effective for other matrix and metallic glass nanoparticle compositions, and our work may shed new light on the development of high-performance metal matrix composites for advanced structural applications.金属基复合材料(MMCs)是在恶劣使用条件下大量重要应用的首选材料。然而，由于基体与增强材料之间存在较高的相对比，复合材料的强度-延性冲突仍然突出。本文制备了一种可变形的钴锆硼(CoZrB)金属玻璃纳米颗粒增强的新型铝基复合材料。仅添加2.0 vol.%颗粒增强的非晶CoZrB/Al复合材料的单轴抗拉强度为387.0±1.2 MPa，在相同的均匀伸长率下，比未增强的纯Al基体提高了80%以上。复合材料的强度-延性协同作用也明显优于完全结晶的纳米颗粒增强复合材料。非晶颗粒/基体界面具有独特的多功能性，可以有效地将载荷从基体转移到颗粒，协调纳米颗粒与基体的共变形，并在基体广泛塑性变形的复合材料中赋予穿晶断裂模式。本研究中开发的方法被证明对其他基质和金属玻璃纳米颗粒组合物普遍有效，我们的工作可能为开发用于高级结构应用的高性能金属基复合材料提供新的思路。Thin-Walled StructuresDeformation and failure behavior of 2024-T42 sheet under impact loadingLang Chen, Zhu Ban, Zhibin Wu, Bo Hu, Yulong Li, Yazhou Guodoi:10.1016/j.tws.2024.112230冲击载荷作用下2024-T42板材的变形与破坏行为The deformation and failure behavior of 2024-T42 aluminum alloy sheet was investigated through a combined experimental-numerical method. Nine types of specimens were designed to cover a wide range of stress triaxialities and strain rates. Quasi-static and dynamic tests were carried out by electronic testing machine and split Hopkinson tensile bar respectively, and digital image correlation (DIC) method was introduced to measure the deformation. The phenomenological damage model GISSMO (generalized incremental stress state dependent damage model) and Johnson-Cook model were adopted to simulate all of the above tests and the load-displacement curves through numerical simulation were derived. An optimization method was developed to obtain all the model parameters by matching the load-displacement curves from simulation with those from tests by LS-OPT. Finally, drop weight tests and tensile tests of the central-hole plate were conducted. The applicability and accuracy of the damage models were verified by comparing the simulation results with the experiments, which indicates that GISSMO model predicts better the tests than the Johnson-Cook failure model.采用试验-数值相结合的方法研究了2024-T42铝合金板材的变形与破坏行为。设计了九种类型的试样，以涵盖广泛的应力三轴性和应变率。采用电子试验机和分离式霍普金森拉伸杆分别进行准静态和动态试验，并采用数字图像相关(DIC)方法测量变形。采用现象学损伤模型GISSMO(广义增量应力状态依赖损伤模型)和Johnson-Cook模型对上述试验进行模拟，并通过数值模拟推导出载荷-位移曲线。提出了一种优化方法，通过LS-OPT将模拟得到的荷载-位移曲线与试验得到的荷载-位移曲线进行匹配，从而获得所有模型参数。最后对中心孔板进行了落锤试验和拉伸试验。通过与试验结果的对比，验证了所建立的损伤模型的适用性和准确性，表明GISSMO模型比Johnson-Cook模型更能预测试验结果。Thermal vibration analysis of bi-directionally stepped porous functionally graded plates with segment-specific material property variation supported by Kerr foundationHaoge Shou, Vu Ngoc Viet Hoang, Peng Shidoi:10.1016/j.tws.2024.112239基于Kerr地基的材料性能变化的双向阶梯多孔功能梯度板热振动分析This paper presents a comprehensive analysis of the nonlinear dynamic response of stepped rectangular plates made of functionally graded porous material (FGPM), supported by the Kerr foundation, in a thermal environment. A novel analytical framework is developed to explore geometric and material variations. The study investigates structural variations in plate thickness with abrupt changes in uni- or bi-directional orientations, examining both single and double stepped thickness profiles. Material properties vary with thickness, featuring distinct horizontal discontinuities across plate segments. Porosity distributions, both even and uneven, are addressed using modified mixture rules. Nonlinear kinematic relationships are established using Reddy’s third-order shear deformation plate theory and von Kármán’s nonlinear geometric assumptions, with equations of motion solved via Galerkin’s technique. This improved model effectively addresses non-continuous thickness variation through integral calculus, enhancing computational efficiency. Validation is achieved by comparing outcomes with published literature and Finite Element Analysis (FEA). The study investigates the influence of material properties, elastic foundation, boundary conditions, and geometric parameters on the free vibration and nonlinear behaviors of the plates. Some of the key findings include: increasing the thickness of the stepped segment significantly heightens the fundamental frequency while reducing vibrational amplitudes; optimizing the location of the stepped segment directly impacts the plate’s fundamental frequency and vibrational amplitudes; and as the load factor increases, the difference between linear and nonlinear deflection becomes evident. Therefore, accurate FGPM stepped plate design requires incorporating nonlinear terms in the strain–displacement relationships. Suggestions for future model modifications are also discussed, contributing to advancements in structural design and analysis.本文综合分析了克尔地基支撑的功能梯度多孔材料(FGPM)矩形阶梯板在热环境下的非线性动力响应。开发了一种新的分析框架来探索几何和材料的变化。该研究考察了单向或双向方向突变下板厚的结构变化，考察了单阶和双阶厚度剖面。材料性能随厚度而变化，具有明显的横向不连续性。使用改进的混合规则处理均匀和不均匀的孔隙度分布。利用Reddy的三阶剪切变形板理论和von Kármán的非线性几何假设建立了非线性运动关系，用伽辽金技术求解了运动方程。该改进模型通过积分计算有效地解决了非连续厚度变化问题，提高了计算效率。通过将结果与已发表的文献和有限元分析(FEA)进行比较来实现验证。研究了材料特性、弹性基础、边界条件和几何参数对板的自由振动和非线性行为的影响。主要发现包括:增加阶梯段的厚度可显著提高基频，同时降低振动幅值;阶梯段位置的优化直接影响板的基频和振动幅值;随着荷载系数的增大，线性挠度和非线性挠度之间的差异变得明显。因此，精确的FGPM阶梯板设计需要在应变-位移关系中纳入非线性项。讨论了对未来模型修改的建议，有助于结构设计和分析的进步。来源：复合材料力学仿真Composites FEM