【新文速递】2025年3月5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 1 篇，Thin-Walled Structures 1 篇International Journal of Solids and StructuresModeling of diffusion-induced inter-/transgranular cracking in polycrystal NCM particles: Effects of external force and boundary constraintsYong Li, Yunpeng Guo, Yuwei Zhang, Wei Feng, Kai Zhang, Xin Wang, Fuqian Yangdoi:10.1016/j.ijsolstr.2025.113300 多晶NCM颗粒扩散诱导的晶间/晶外裂纹建模：外力和边界约束的影响Experimental results have evidenced that appropriate external forces can mitigate structural degradation and damage of active particles during electrochemical cycling of metal-ion batteries. Currently, there are few studies on structural degradation and damage of active particles under concurrent action of diffusion and external loading. Using finite-discrete element method (FDEM), we analyze diffusion-induced cracking in a polycrystal NCM (lithium nickel manganese cobalt oxide) particle under three different configurations: traction-free boundary, rigid confinement to opposite ends, and external loading to opposite ends under constant influx. The numerical results illustrate that appropriate external loading can suppress the nucleation and propagation of cracks induced by the diffusion of solute atoms and retard structural degradation/damage of polycrystal NCM particles. Increasing the amount of solute atoms and applying excessive external loading can promote the nucleation and propagation of cracks in polycrystal NCM particles due to large contact deformation and the deformation induced by the diffusion of solute atoms, which escalates structural degradation/damage of the electrodes in metal-ion batteries.实验结果表明，适当的外力可以减轻金属离子电池电化学循环过程中活性粒子的结构降解和损伤。目前，对于扩散和外载荷共同作用下活性颗粒的结构降解和损伤研究较少。利用有限离散元方法（FDEM），我们分析了多晶NCM（锂镍锰钴氧化物）颗粒在三种不同配置下的扩散诱导裂纹：无牵拉边界、刚性约束到对端以及恒定流入下对端外部载荷。数值结果表明，适当的外载荷可以抑制溶质原子扩散引起的裂纹形核和扩展，延缓多晶NCM颗粒的结构退化/损伤。增加溶质原子的数量和施加过大的外载荷可以促进多晶NCM颗粒中裂纹的形核和扩展，这是由于大的接触变形和溶质原子扩散引起的变形，从而加剧了金属离子电池中电极的结构退化/损伤。Journal of the Mechanics and Physic s of SolidsControl of competing delamination in peeling-based microtransfer printingAoyi Luo, Yiping Zhou, Yunfeng Yan, Jianyu Li, Changhong Caodoi:10.1016/j.jmps.2025.106090 剥离微转移印花中竞争分层的控制This paper investigates the mechanics of peeling-based microtransfer printing, focusing on the competing delamination at the stamp/ink and the ink/substrate interfaces under both high-degree and zero-degree peeling configurations. We found that the thickness and modulus contrast between the stamp and the ink significantly affect the ratio of the energy release rates at these two interfaces. Our findings also reveal that high-degree peeling has limited capability in promoting the printing of thin inks, whereas zero-degree peeling shows significant potential in facilitating this process. Experimental validations were performed to verify the proposed mechanics. Based on these insights, we discussed several strategies to tune the ratio of the energy release rates at the two interfaces to achieve controlled microtransfer printing, and conducted case studies and performed simple demonstrations to illustrate the practical applications of these strategies.本文研究了基于剥离的微转移印刷的机理，重点研究了在高度剥离和零度剥离配置下，邮票/油墨和油墨/承印物界面的竞争分层。我们发现，印版和油墨之间的厚度和模量对比显著影响这两个界面的能量释放率之比。我们的研究结果还表明，高度剥离在促进薄油墨印刷方面的能力有限，而零度剥离在促进这一过程中表现出巨大的潜力。实验验证了所提出的力学特性。基于这些见解，我们讨论了几种策略来调整两个界面的能量释放率的比例，以实现受控的微转移打印，并进行了案例研究和简单的演示来说明这些策略的实际应用。Mechanics of MaterialsThe most severe imperfection governs the buckling strength of pressurized multi-defect hemispherical shellsFani Derveni, Florian Choquart, Arefeh Abbasi, Dong Yan, Pedro M. Reisdoi:10.1016/j.mechmat.2025.105295 最严重的缺陷决定了受压多缺陷半球形壳的屈曲强度We perform a probabilistic investigation on the effect of systematically removing imperfections on the buckling behavior of pressurized thin, elastic, hemispherical shells containing a distribution of defects. We employ finite element simulations, which were previously validated against experiments, to assess the maximum buckling pressure, as measured by the knockdown factor, of these multi-defect shells. Specifically, we remove fractions of either the least or the most severe imperfections to quantify their influence on the buckling onset. We consider shells with a random distribution of defects whose mean amplitude and standard deviation are systematically explored while, for simplicity, fixing the width of the defect to a characteristic value. Our primary finding is that the most severe imperfection of a multi-defect shell dictates its buckling onset. Notably, shells containing a single imperfection corresponding to the maximum amplitude (the most severe) defect of shells with a distribution of imperfections exhibit an identical knockdown factor to the latter case. Our results suggest a simplified approach to studying the buckling of more realistic multi-defect shells, once their most severe defect has been identified, using a well-characterized single-defect description, akin to the weakest-link setting in extreme-value probabilistic problems.我们对系统地去除缺陷对含有缺陷分布的受压薄弹性半球形壳的屈曲行为的影响进行了概率调查。我们采用有限元模拟（之前已通过实验验证）来评估这些多缺陷壳体的最大屈曲压力（通过击倒因子测量）。具体来说，我们去除最小或最严重缺陷的部分，以量化它们对屈曲发生的影响。我们考虑具有缺陷随机分布的壳层，这些缺陷的平均振幅和标准差被系统地探索，同时，为了简单起见，将缺陷的宽度固定为一个特征值。我们的主要发现是多缺陷壳最严重的缺陷决定了它的屈曲开始。值得注意的是，含有单个缺陷的壳与具有缺陷分布的壳的最大振幅（最严重）缺陷相对应，表现出与后一种情况相同的击倒因子。我们的研究结果提出了一种简化的方法来研究更现实的多缺陷壳的屈曲，一旦确定了最严重的缺陷，就可以使用特征良好的单缺陷描述，类似于极值概率问题中的最薄弱环节设置。International Journal of PlasticitySize effects on the plastic behavior of polycrystalline materials: Grain size, precipitation state and free-surface effectsDamien Texier, Julien Genée, Vincent Velay, Antonio Castro Moreno, Daniel Monceau, Eric Andrieudoi:10.1016/j.ijplas.2025.104284尺寸对多晶材料塑性行为的影响：晶粒尺寸、析出状态和自由表面效应Surface effects were investigated using ultrathin specimens with thicknesses in the order of the grain size of the material. The candidate material was a polycrystalline Ni-based superalloy (Alloy 718) purposely heat treated to document both the effects of the grain size and the metallurgical state, i.e., solid solution and precipitation hardened state, on the polycrystalline to multicrystalline behavior. Ultrathin tensile specimens were prepared with a dedicated technique to obtain specimens with thicknesses ranging between 20 and 550 μm, then tensile tested at room temperature. The polycrystalline-to-multicrystalline transition (PMT) was found to depend on the material grain size relative to the specimen thickness and to impair severely the tensile strength of the material. The yield strength, ultimate tensile strength (maximal stress on the stress-strain curve) and strain-to-failure severely dropped for specimens thinner than approximately two times the grain size of the material regardless of the metallurgical state. Such a decrease in tensile properties is mainly attributed to free-surface effects acting as an escape sink of dislocations, thus leading to a significant decrease of the primary dislocations density within the surface grains in comparison with the core grains. Interestingly, difference in work hardening behavior with size reduction was found between both precipitation states, the solid solution state being more sensitive with the size reduction. The decrease in tensile properties was not found as expected from the commonly reported “thickness/grain size (t/D)” ratio. Therefore, a numerical approach using a modified Berveiller-Zaoui self-consistent model based on a continuum crystal plasticity approach was conducted in the present paper to distinguish microstructural features acting as strengthening (dislocation accumulation) and softening (dislocation escape at the free surface) features. 3D numerical materials were produced using Voronoi tesselation methods to represent the fraction of “core grains” versus “surface grains”. These fractions were then used as microstructural parameters for the identification of a crystal plasticity model using mean-field homogenization with different populations of grains, i.e., core versus surface features. The present work aimed at distinguishing the mechanical behavior of surface grains from core grains in Alloy 718 Ni-based superalloys using various thicknesses of specimens and different microstructure and metallurgical state variants.采用厚度与材料晶粒尺寸相当的超薄试样对表面效应进行了研究。候选材料为一种多晶镍基高温合金（718 合金），经过专门热处理以记录晶粒尺寸和冶金状态（即固溶强化和沉淀强化状态）对多晶到多晶态转变的影响。采用专门技术制备了厚度在 20 至 550 微米之间的超薄拉伸试样，然后在室温下进行拉伸试验。发现多晶到多晶态转变（PMT）取决于材料晶粒尺寸与试样厚度的相对关系，并且严重削弱了材料的拉伸强度。无论冶金状态如何，对于厚度小于材料晶粒尺寸约两倍的试样，屈服强度、极限抗拉强度（应力 - 应变曲线上的最大应力）和断裂应变均大幅下降。这种拉伸性能的下降主要归因于自由表面效应充当了位错的逃逸汇，从而导致表面晶粒内的初始位错密度与核心晶粒相比显著降低。有趣的是，在两种析出状态下，随着尺寸减小，加工硬化行为存在差异，固溶态对尺寸减小更为敏感。拉伸性能的下降并非如通常报道的“厚度/晶粒尺寸（t/D）”比所预期的那样。因此，本文采用基于连续晶体塑性方法的改进型 Berveiller-Zaoui 自洽模型的数值方法，以区分作为强化（位错堆积）和软化（自由表面处位错逃逸）特征的微观结构特征。使用 Voronoi 镶嵌方法生成了 3D 数值材料，以表示“核心晶粒”与“表面晶粒”的比例。这些分数随后被用作微观结构参数，以通过均值场同质化方法识别具有不同晶粒群体（即核心与表面特征）的晶体塑性模型。本研究旨在通过使用不同厚度的试样以及不同的微观结构和冶金状态变体，区分 718 镍基高温合金中表面晶粒与核心晶粒的机械行为。Thin-Walled StructuresStructural behaviour and design of a novel cold-formed steel-concrete composite beamYiming He, Liusi Dai, Yuner Huang, Zhipeng Zhang, Chong Rendoi:10.1016/j.tws.2025.113115一种新型冷弯型钢-混凝土组合梁的结构性能与设计This paper presents an experimental and numerical investigation of the structural behaviour of a novel cold-formed steel-concrete (CFSC) composite beam. Four-point bending tests were performed to examine the failure mode, ductility, and ultimate moment of all specimens. The specimens were generally failed by flexural cracks and flexural-shear cracks in the concrete, and localised flange deformation at the loading points occurred in the cold-formed steel (CFS) hollow section. Subsequently, numerical models were established and validated against the tests. A parameter analysis was performed on the bolt number, section slenderness of the CFS, and concrete cover thickness. Concrete encasement improved the ultimate moment of the CFS. Installing bolts could further improved the composite actions of steel and concrete. The improved effect provided by either bolts or concrete was more evident in specimens with a larger CFS section slenderness. Finally, a design formula for the ultimate moments was proposed based on the section analysis method. A comparison of the calculated results with the experimental and numerical data demonstrated that the proposed design formula could accurately predict the ultimate moments of the novel CFSC composite beams.本文对一种新型冷弯型钢-混凝土组合梁的结构性能进行了试验和数值研究。进行四点弯曲试验，检验所有试件的破坏模式、延性和极限弯矩。试件的破坏主要是混凝土的弯曲裂缝和弯剪裂缝，冷弯型钢空心截面在加载点处出现局部凸缘变形。随后，建立了数值模型，并对试验结果进行了验证。对锚杆数、CFS截面长细比和混凝土覆盖厚度进行了参数分析。混凝土围护提高了CFS的极限弯矩。安装螺栓可以进一步提高钢与混凝土的复合性能。锚杆和混凝土的改善效果在CFS截面长细比较大的试件中更为明显。最后，提出了基于截面分析法的极限弯矩设计公式。计算结果与试验和数值数据的比较表明，所提出的设计公式能够准确地预测新型CFSC组合梁的极限弯矩。来源：复合材料力学仿真Composites FEM