【新文速递】2024年11月7日复合材料SCI期刊最新文章_ACT_Mechanical_Additive_Flux_Inspire_疲劳_断裂_复合材料_通用_航空_航天_电子_增材_裂纹_材料_多尺度_控制

【新文速递】2024年5月26日固体力学SCI期刊最新文章

今日更新：International Journal of Solids and Structures 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 2 篇International Journal of Solids and StructuresSurface wrinkling of a hyperelastic half-space coated by a liquid crystal elastomer filmYang Liu, Qianqian Ji, Alain Gorielydoi:10.1016/j.ijsolstr.2024.112895液晶弹性体膜涂覆的超弹性半空间的表面起皱We consider the stability of a hyperelastic substrate coated by a liquid crystal elastomer film and subjected to compressive forces. In this problem, the liquid crystal elastomer directors are free to evolve and this possible variation needs to be included in the stability analysis. We consider the case where the initial directors are aligned either in the horizontal or in the vertical direction and obtain an exact bifurcation condition for surface wrinkling. We show that director reorientation increases both the critical compressive strain and the critical wavenumber, hence stabilizing the material. In the small wavenumber limit we carry out an asymptotic analysis and obtain analytical solutions for the critical stretch and the critical wavenumber, which can be useful in applications.我们考虑了一种被液晶弹性体薄膜包裹并受到压缩力作用的超弹性衬底的稳定性。在此问题中，液晶弹性体导向是自由演化的，需要在稳定性分析中考虑这种可能的变异。我们考虑了初始方向在水平或垂直方向上对齐的情况，并得到了表面起皱的精确分岔条件。我们发现，定向取向增加了临界压缩应变和临界波数，从而稳定了材料。在小波数极限下进行了渐近分析，得到了临界拉伸和临界波数的解析解，具有一定的应用价值。International Journal of PlasticityA multiscale constitutive model of magnesium-shape memory alloy compositeBo Xu, Aonan Su, Ziyi Wang, Chao Yu, Guozheng Kangdoi:10.1016/j.ijplas.2024.104011镁形记忆合金复合材料的多尺度本构模型In this work, a multiscale constitutive model is established to describe the deformation behaviors of magnesium-shape memory alloy (Mg-SMA) composite in a wide temperature range and reveal the strengthening mechanism of SMA reinforcement on Mg. The model is established at the grain scale firstly and gradually transited to the macroscopic scale by employing a newly developed three-level scale transition rule. At the grain scale, the thermodynamic-consistent constitutive models of Mg and SMA are, respectively, constructed by addressing different inelastic deformation mechanisms. The basal, prismatic, pyramidal, slip systems and extension twinning system are considered for the Mg phase, and the martensite transformation (MT) and austenitic plasticity are addressed for SMA reinforcement. Thermodynamic driving forces of each inelastic deformation mechanism are derived from the dissipative inequality and the constructed Gibbs free energies. At the polycrystalline scale, to evaluate the interactions among the grains and pores, and obtain the whole responses of the polycrystalline Mg and SMA, a thermo-mechanically coupled self-consistent homogenization scheme is employed. At the mesoscopic scale, a modified thermo-mechanically coupled Mori-Tanaka's homogenization scheme is adopted to evaluate the interaction between the Mg phase and SMA phase, and predict the whole responses for the representative volume element (RVE) of the composite. According to the geometrical features and mechanical loadings applied on the specimen, a hypothesis of homogeneous stress and strain fields at the macroscopic scale is adopted to achieve the scale transition from the RVE of the composite to the whole specimen. The capacity of the multiscale model is verified by comparing the predictions with the existing experimental data (Aydogmus, 2015). Moreover, the influences of characteristic information for the microstructures at different spatial scales on the deformation behaviors of the composite are predicted and discussed.本文建立了镁形状记忆合金(Mg-SMA)复合材料在宽温度范围内的变形行为的多尺度本构模型，揭示了镁形状记忆合金对镁的强化机理。该模型首先在颗粒尺度上建立，然后采用新提出的三级尺度过渡规则逐步过渡到宏观尺度。在晶粒尺度上，通过处理不同的非弹性变形机制，分别建立了Mg和SMA的热力学一致本构模型。Mg相考虑基相、棱柱相、锥体相、滑移体系和延伸孪晶体系，SMA强化研究马氏体相变(MT)和奥氏体塑性。利用耗散不等式和构造的吉布斯自由能推导出各非弹性变形机制的热力学驱动力。在多晶尺度上，为了评估晶粒与孔隙之间的相互作用，获得多晶Mg和SMA的整体响应，采用了热-机械耦合自一致均匀化方案。在介观尺度上，采用改进的热-机械耦合Mori-Tanaka均一化方案评价了Mg相与SMA相的相互作用，并预测了复合材料的代表性体积元(RVE)的整体响应。根据试件的几何特征和受力情况，采用宏观尺度均质应力场和应变场假设，实现了从复合材料的RVE到整个试件的尺度转换。通过将预测结果与现有实验数据进行比较，验证了多尺度模型的能力(Aydogmus, 2015)。此外，还预测和讨论了不同空间尺度下微观组织特征信息对复合材料变形行为的影响。Thin-Walled StructuresInvestigating the relationship between fracture entropy and stress amplitude in CFRP laminates under low-cycle fatigue loadingBo An, Aijia Li, Qianzhu Mao, Jia Huangdoi:10.1016/j.tws.2024.112040研究低周疲劳载荷下CFRP层合板断裂熵与应力幅值的关系Fracture fatigue entropy (FFE) is considered to be independent of the loading amplitude in fatigue experiments, and this conclusion has been applied to fatigue life prediction of composites and metals with satisfactory prediction accuracy. However, the existing research work mainly focuses on high-cycle fatigue, and it is not clear whether the FFE is independent of the loading amplitude in low-cycle fatigue, which requires more in-depth research. Fatigue experiments were conducted on three CFRP laminates with different ply orientations, and the FFE values corresponding to low-cycle fatigue were obtained by thermographic analysis. The results show that the FFE value is no longer independent of the loading amplitude under low-cycle fatigue conditions. On the contrary, it decreases with the increase of fatigue loading amplitude and also varies with different ply orientations. The relationship between low-cycle fracture fatigue entropy and loading amplitude of composites with different ply orientations was analyzed and modeled, and a novel low-cycle fatigue life prediction method based on FFE was developed.在疲劳试验中，断裂疲劳熵与载荷幅值无关，这一结论已应用于复合材料和金属的疲劳寿命预测，预测精度令人满意。然而，现有的研究工作主要集中在高周疲劳上，在低周疲劳下，FFE是否与加载幅值无关尚不清楚，这需要更深入的研究。对3种不同铺层取向的CFRP复合材料进行了疲劳试验，通过热像分析得到了其低周疲劳的FFE值。结果表明，在低周疲劳工况下，FFE值不再与加载幅值无关。相反，随着疲劳载荷幅值的增大而减小，并随层向的不同而变化。对不同铺层取向复合材料的低周断裂疲劳熵与加载幅值的关系进行了分析和建模，提出了一种基于FFE的低周疲劳寿命预测方法。Collision-induced adhesion behavior and mechanism for metal particle and grapheneHaitao Hei, Jian Wang, Yonggang Zheng, Hongfei Yedoi:10.1016/j.tws.2024.112045 金属颗粒与石墨烯的碰撞诱导粘附行为及机理Micro- and nano-scale collisions exhibit extraordinary behavior compared to the common macroscopic collisions. Understanding the size-dependent collision behavior and the relevant mechanism is of great significant for molecular movement, drug delivery, and the design of novel anti-collision materials. In this work, we explore the comprehensive impact dynamics of metal projectiles on graphene by using molecular dynamics simulations. It has been discovered that in addition to the normal penetration and rebound behaviors, ultrasoft two-dimensional materials can also capture impacting metal projectiles, i.e., the adhesion behavior. This abnormal behavior is primarily attributed to the dissipation of kinetic energy during impact, which leads to the weak rebounded kinetic energy relative to the interactions between the impacting objects. Additionally, in the case of finite-sized graphene, the projectile may receive additional energy from the reflected cone wave at the boundary to escape the adhesion. This phenomenon is referred to as adhesion-rebound behavior. We present the phase diagrams illustrating the impact behaviors under various conditions such as projectile stiffness, impact velocity, graphene size, projectile sizes, and projectile density. This work provides an insight into the multiscale collision phenomena and an instructive strategy for the design of transfer printing, collision protection, etc.与普通的宏观碰撞相比，微观和纳米尺度的碰撞表现出不同寻常的行为。了解尺寸依赖性碰撞行为及其相关机制对分子运动、药物传递和新型抗碰撞材料的设计具有重要意义。在这项工作中，我们通过分子动力学模拟探索了金属弹丸对石墨烯的综合撞击动力学。研究发现，除了常规的侵彻和回弹行为外，超软二维材料还可以捕捉金属弹丸的冲击，即粘附行为。这种异常行为主要是由于撞击过程中动能耗散，导致相对于撞击物体之间的相互作用，反弹动能较弱。此外，在有限尺寸石墨烯的情况下，弹丸可能会从边界处反射的锥波中获得额外的能量，以逃避粘附。这种现象被称为粘附-反弹行为。我们展示了不同条件下的相图，如弹丸刚度、冲击速度、石墨烯尺寸、弹丸尺寸和弹丸密度。本研究为多尺度碰撞现象的研究提供了新的视角，并为转移印刷、碰撞保护等的设计提供了指导策略。来源：复合材料力学仿真Composites FEM

【新文速递】2024年11月7日复合材料SCI期刊最新文章

Composites Part B: Engineering

【新文速递】2024年5月26日固体力学SCI期刊最新文章