【新文速递】2025年2月26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，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 Structures

Modeling of diffusion-induced inter-/transgranular cracking in polycrystal NCM particles: Effects of external force and boundary constraints

Yong Li, Yunpeng Guo, Yuwei Zhang, Wei Feng, Kai Zhang, Xin Wang, Fuqian Yang

doi: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 Solids

Control of competing delamination in peeling-based microtransfer printing

Aoyi Luo, Yiping Zhou, Yunfeng Yan, Jianyu Li, Changhong Cao

doi: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 Materials

The most severe imperfection governs the buckling strength of pressurized multi-defect hemispherical shells

Fani Derveni, Florian Choquart, Arefeh Abbasi, Dong Yan, Pedro M. Reis

doi: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 Plasticity

Size effects on the plastic behavior of polycrystalline materials: Grain size, precipitation state and free-surface effects

Damien Texier, Julien Genée, Vincent Velay, Antonio Castro Moreno, Daniel Monceau, Eric Andrieu

doi: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 Structures

Structural behaviour and design of a novel cold-formed steel-concrete composite beam

Yiming He, Liusi Dai, Yuner Huang, Zhipeng Zhang, Chong Ren

doi: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

【新文速递】2025年2月21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，Thin-Walled Structures 2 篇International Journal of Solids and StructuresBond exchange reactions as a paradigm for mitigating residual stress in polymer matrix fiber compositesZhongtong Wang, Robert J. Wagner, Tianke Chen, Sagar P. Shah, Marianna Maiaru, Meredith N. Silbersteindoi:10.1016/j.ijsolstr.2025.113286键交换反应作为减轻聚合物基纤维复合材料残余应力的范例Polymer matrix fiber composites often suffer from residual stresses due to differences in coefficients of thermal expansion between the fibers and resins, as well as contractile strain of the resins during curing. To address residual stress driven composite failure, we propose the use of vitrimers as composite resins, which can undergo thermally activated, stress alleviating, bond exchange reactions (BERs). We conduct fiber Bragg grating measurements for a single glass fiber within bulk vitrimer. These show that the fiber strain in vitrimers with 5% catalyst is significantly lower than in those with 0% catalyst (minimal BER expected) during both curing and post-curing phases. We developed a finite deformation, micromechanically-inspired model that incorporates curing, thermal processes, and BERs, and then implemented this model it into finite element software to simulate stress evolution within single fiber composite systems. The combination of experimental and computational results reveals that BERs can effectively mitigate, but not eliminate, the residual stress in polymer matrix fiber composites.由于纤维与树脂热膨胀系数的差异以及树脂在固化过程中的收缩应变，聚合物基纤维复合材料往往会产生残余应力。为了解决残余应力驱动的复合材料失效问题，我们建议使用玻璃体作为复合树脂，它可以进行热激活，应力缓解，键交换反应（ber）。我们对散装玻璃体中的单个玻璃纤维进行了光纤布拉格光栅测量。结果表明，在固化和后固化阶段，添加5%催化剂的玻璃体中的纤维应变明显低于添加0%催化剂的玻璃体（期望的最小BER）。我们开发了一个有限变形、微力学启发的模型，该模型结合了固化、热过程和ber，然后将该模型应用到有限元软件中，以模拟单纤维复合材料系统中的应力演变。实验与计算结果相结合表明，聚合物基纤维复合材料中的残余应力可以有效地减轻，但不能完全消除。Journal of the Mechanics and Physics of SolidsInvestigating the formation of a geometrically necessary boundary using discrete dislocation dynamicsFelix Frankus, Yash Pachaury, Anter El-Azab, Benoit Devincre, Henning Friis Poulsen, Grethe Wintherdoi:10.1016/j.jmps.2025.106069利用离散位错动力学研究几何必要边界的形成A systematic numerical study using discrete dislocation dynamics has been conducted to investigate the formation of geometrically necessary dislocation boundaries (GNBs), a fundamental component of dislocation patterning and work-hardening. The simulations presented in this paper focus on GNBs forming along the (010) plane, which are observed in the (121) [111] copper orientation on the β-fibre of the FCC rolling texture. The results demonstrate that GNBs can emerge as a relaxation product, self-organizing to satisfy low-energy theorems such as the Frank equation. Additionally, the requirements for the involved slip systems and their relative densities to form stable mobile and immobile boundaries are evaluated.采用离散位错动力学进行了系统的数值研究，以探究几何必位错边界（GNBs）的形成，这是位错图案化和加工硬化的一个基本组成部分。本文所展示的模拟重点在于沿（010）面形成的 GNBs，这种现象在面心立方（FCC）轧制织构的β纤维上的（121）[111]铜取向上被观察到。结果表明，GNBs 可以作为松弛产物出现，自我组织以满足诸如弗兰克方程之类的低能定理。此外，还评估了形成稳定移动和固定边界的所涉及滑移系及其相对密度的要求。Mechanics of MaterialsHigher-Order Indentation Model based on Mixture Unified Gradient with Surface Elasticity: A Theoretical StudyChuan He, Yuanming Lai, Enlong Liu, Siming He, Jianhai Zhang, Yunming Yangdoi:10.1016/j.mechmat.2025.105298基于混合统一梯度和表面弹性的高阶压痕模型的理论研究This study proposes a higher-order framework for half-space indentation based on mixture unified gradient theory (MUGT) with surface elasticity (SE). MUGT, a well-posed theory that captures both nonlocal and strain gradient properties, is essential for understanding size effects in nano/micro-scale materials and structures. However, indentation problems considering MUGT remain unexplored. We develop efficient analytical and numerical methods to address the problem. In the 3D context, the stress components are analytically determined using 2D Fourier transform applied to constitutive relations that incorporate stress gradient elasticity. Regarding the contact pressure, the problem results in integral equations whose kernel is challenging to obtain explicitly. These are numerically solved using the sum of independent functions, rather than relying on discrete point values as done in previous studies on singular integral equations. Our findings demonstrate that stress gradient elasticity leads to greater surface vertical displacement, whereas strain gradient and surface elasticity result in smaller surface vertical displacement, highlighting the softening and hardening behaviors respectively. Drastically different contact pressure distributions and surface vertical displacements can be obtained compared to existing theories. Particularly, both hardening and softening of size-dependent indentation hardness are intrinsically captured, aligning with available experimental observations. These behaviors, however, are challenging to simultaneously reflect in existing indentation theories due to the exclusion of stress gradient elasticity. The study enhances the understanding of contact mechanics and is of practically significance for nano/micro-scale materials and structures.提出了一种基于混合统一梯度理论（MUGT）和表面弹性（SE）的半空间压痕高阶框架。MUGT是一种完备的理论，可以捕获非局部和应变梯度特性，对于理解纳米/微尺度材料和结构中的尺寸效应至关重要。然而，考虑到MUGT的缩进问题仍未被探索。我们开发了有效的分析和数值方法来解决这个问题。在3D环境中，应力分量是使用应用于包含应力梯度弹性的本构关系的二维傅里叶变换来解析确定的。对于接触压力，问题的结果是积分方程，其核很难明确地得到。这些都是用独立函数的和进行数值求解，而不是像以前研究奇异积分方程那样依赖于离散点值。研究结果表明，应力梯度弹性导致较大的表面垂直位移，而应变梯度和表面弹性导致较小的表面垂直位移，分别表现出软化和硬化行为。与现有理论相比，可以得到截然不同的接触压力分布和表面垂直位移。特别是，与尺寸相关的压痕硬度的硬化和软化本质上被捕获，与现有的实验观察一致。然而，由于排除了应力梯度弹性，现有压痕理论很难同时反映这些行为。该研究增强了对接触力学的认识，对纳米/微尺度的材料和结构具有实际意义。Thin-Walled StructuresDeep learning-based study of strength variance coefficient for large diameter thin-walled structuresHongfei Fu, Weixiu Xv, Fan Yang, Liangliang Jiang, Yuhong Shidoi:10.1016/j.tws.2025.113059基于深度学习的大直径薄壁结构强度方差系数研究Strength variation coefficient is a basic parameter to carry out structural reliability design and assessment, for the large diameter thin-walled structure test to obtain the strength variation coefficient is expensive, this paper is based on the actual measurement of the product information, the application of finite element simulation and analysis methods, comprehensive consideration of the material properties, structural dimensions and geometrical uncertainty factors, put forward a method for the study of strength variation coefficients of thin-walled structures based on multi-head CNN. Taking the multi-wall panel welded stiffened rocket tank cylinder section as the research object, the geometric imperfection of a single panel is used as a sub-sample, and the particle swarm optimisation based inter-wall panel connection coordination method is used to achieve the geometric imperfection random field construction; relying on a small number of experiments, a multi-head convolutional network structure is used to realise the fusion of uncertain features of material properties, structural dimensions and geometrical imperfections at different scales, to efficiently establish an ‘uncertainty-response’ mapping model, and to realise the prediction of strength variation coefficients at low cost. The research results show that the method is able to identify the complex action law of geometrical imperfection on structural bearing, and the accuracy of the prediction of bearing capacity is more than 99.2%; it can realise the accurate quantitative analysis of the coefficient of variation of the strength of thin-walled structure and its influencing factors, and the predicted coefficient of variation of the structural strength of the structure is reasonably encompassed by the upper limit of the test value.强度变异系数是进行结构可靠性设计和评估的基本参数，对于大直径薄壁结构试验获取强度变异系数代价高昂，本文在实际测量产品资料的基础上，应用有限元模拟分析方法，综合考虑材料性能、结构尺寸和几何等不确定性因素，提出了一种基于多头CNN的薄壁结构强度变化系数研究方法。以多壁板焊接加筋火箭燃料箱缸体截面为研究对象，以单壁板的几何缺陷为子样本，采用基于粒子群优化的壁板连接协调方法实现几何缺陷随机场的构建；基于少量实验，采用多头卷积网络结构，实现了不同尺度下材料性能、结构尺寸、几何缺陷等不确定特征的融合，高效建立了“不确定性-响应”映射模型，实现了低成本强度变异系数的预测。研究结果表明，该方法能够识别几何缺陷对结构支座的复杂作用规律，预测承载力的准确率达99.2%以上；可实现对薄壁结构强度变异系数及其影响因素的准确定量分析，并将预测的结构强度变异系数合理地包含在试验值的上限之内。Experimental study on wind-induced fatigue performance of standing seam metal cladding systems with anti-wind clipsQingshan Yang, Ze Wang, Min Liu, Qisheng Liang, Shidong Nie, Ruolin Liu, Wei Chendoi:10.1016/j.tws.2025.113099带防风夹的立缝金属覆层系统风致疲劳性能试验研究Standing seam metal cladding systems with anti-wind clips are extensively used in public buildings located in regions prone to strong winds. These reinforced seam-clip connections are susceptible to fatigue effects when subjected to long-term fluctuating wind loads. The complex mechanical behaviors of these connections contribute to a complex fatigue-induced failure mechanism, which is crucial for evaluating the fatigue performance of the systems but has received limited attention in existing studies. This study systematically analyzed the fatigue-induced failure mechanism of such systems using an air pressure box and prototype specimens. Quasi-static tests were conducted initially to determine the ultimate bearing capacity of the systems, followed by dynamic fatigue tests involving eight loading scenarios with various amplitudes. The study found significant differences between pull-out failures in static tests and tearing failures in dynamic tests. High stress concentration zones, particularly at metal sheet contacts with anti-wind clips and bending areas, can exacerbate damage accumulation under dynamic loads. These zones can initiate cracks when the cycle reaches 47% of the fatigue life and expedite their propagation, ultimately leading to tearing failure. The dynamic response has been analyzed, with differences from the static response quantified. To assess the resistance capacity of systems to tearing failures, a fatigue life model was proposed to elucidate the relationship between load amplitudes and cycles. A diminishing trend in the model with the increase of amplitudes indicates that the fatigue resistance capacity is susceptible to high load amplitudes. These findings can effectively evaluate the fatigue resistance capacity of the systems.带有防风夹的立缝金属覆层系统广泛应用于位于强风易发地区的公共建筑中。当经受长期波动风荷载时，这些加固的接缝夹连接容易产生疲劳效应。这些连接的复杂力学行为导致了复杂的疲劳破坏机制，这对于评估系统的疲劳性能至关重要，但在现有的研究中受到的关注有限。本研究采用气压箱和原型试样系统地分析了这类系统的疲劳破坏机理。首先进行准静态试验以确定系统的极限承载能力，然后进行动态疲劳试验，包括8种不同幅值的加载场景。研究发现，静态试验中的拔出失效与动态试验中的撕裂失效存在显著差异。高应力集中区，特别是在金属板与防风夹和弯曲区域的接触处，会加剧动载荷下的损伤积累。当循环达到疲劳寿命的47%时，这些区域会产生裂纹，并加速裂纹的扩展，最终导致撕裂失效。分析了动态响应，量化了与静态响应的差异。为了评估系统对撕裂失效的抵抗能力，提出了一个疲劳寿命模型来阐明载荷幅值与循环之间的关系。随着幅值的增大，模型的抗疲劳能力呈递减趋势，表明高载荷幅值对疲劳抗力影响较大。这些结果可以有效地评价系统的抗疲劳能力。来源：复合材料力学仿真Composites FEM