今日更新：Journal of the Mechanics and Physics of Solids 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 7 篇Journal of the Mechanics and Physics of SolidsOn the elastic problem of representative volume element for multiphase thin filmsAhmad Ahmad, Kyle Starkey, Khaled SharafEldin, Anter El-Azabdoi:10.1016/j.jmps.2025.106142多相薄膜代表性体积元的弹性问题Multiphase thin films exhibit unique physical functionalities stemming from their dimensions and interactions among phases. In these materials, elasticity plays an important role both in their growth and physical performance. An outstanding problem in this regard is the elastic formulation of representative volume element (RVE) of thin film systems. As thin films RVEs lack translation invariance in the direction perpendicular to the film free surface, the boundary value problem of the RVE involves integral kinematic boundary constraints that must be satisfied together with the governing elastic boundary value problem. These constraints were developed here as a part of a homogenization scheme designed to deliver the elastic solution in a heterogeneous thin film, with both eigenstrain and modulus mismatch within the phases. We formulated this problem together with an iterative solution scheme based on Fast Fourier Transform with an augmented Lagrangian fixed-point iteration algorithm. The numerical solution was benchmarked with the analytical solution of the famous Eshelby problem for the case of homogeneous and inhomogeneous cylindrical inclusions. Diffuse interface and discrete Green's operator methods were tested to investigate the attenuation of Gibbs oscillations at interfaces. Examples of thin film morphologies generated using kinetic Monte Carlo simulations at different growth conditions were used as microstructure input to test the current approach. We show that the elastic energy tends to be concentrated near the pillar/matrix interface. This approach is expected to enable the on-the-fly coupling of elasticity solution with thin film growth models to account for the elastic strain effects on diffusion, bonding, and interfacial energies.多相薄膜由于其尺寸和相间的相互作用而表现出独特的物理功能。在这些材料中，弹性在其生长和物理性能中都起着重要的作用。在这方面的一个突出问题是薄膜系统的代表性体积元（RVE）的弹性公式。由于薄膜RVE在垂直于薄膜自由表面的方向上缺乏平移不变性，因此RVE的边值问题涉及到必须与控制弹性边值问题一起满足的积分运动学边界约束。这些约束在这里被开发为均匀化方案的一部分，设计用于在相内具有特征应变和模量不匹配的非均质薄膜中提供弹性溶液。提出了一种基于快速傅立叶变换和增广拉格朗日不动点迭代算法的迭代求解方案。数值解以著名的均匀和非均匀圆柱形夹杂的Eshelby问题的解析解为基准。用扩散界面和离散格林算子方法研究了界面处吉布斯振荡的衰减。利用动力学蒙特卡罗模拟在不同生长条件下生成的薄膜形貌示例作为微观结构输入来测试当前方法。结果表明，弹性能倾向于集中在柱/基体界面附近。这种方法有望实现弹性溶液与薄膜生长模型的动态耦合，以解释弹性应变对扩散、键合和界面能的影响。International Journal of PlasticityInvestigate irradiation hardening behavior in BCC refractory high-entropy alloys using phase-field modeling informed by atomistic simulations of displacement cascadesJie Li, Yaxin Zhu, Lv Zhao, Shuang Liang, Minsheng Huang, Zhenhuan Lidoi:10.1016/j.ijplas.2025.104340利用位移级联原子模拟的相场模型研究BCC耐火高熵合金的辐照硬化行为Refractory high-entropy alloys (RHEAs) exhibit excellent anti-irradiation properties, making them promising candidates for application in advanced nuclear reactors. In this study, molecular statics (MS) and molecular dynamics (MD) simulations are conducted to investigate the local unstable stacking fault energies (USFE) in RHEAs induced by primary knock-on atoms (PKAs) of displacement cascades. Based on these atomistic simulations, a phase-field dislocation dynamics (PFDD) model is developed, incorporating the effects of chemical composition fluctuations and displacement cascades on local USFE in RHEAs using a random statistical approach. Using this PFDD model, the planar motion of edge and screw dislocations, as well as the cross-slip behavior of screw dislocations, in WTaCrV are examined. The results indicate that the cascade region can effectively pin edge dislocations and hinder the nucleation of kink pairs in screw dislocations, leading to irradiation hardening. However, the low local USFE caused by chemical composition fluctuations in WTaCrV allows edge dislocation segments near pinning sites to bow out, dragging pinned dislocation segments and reducing the pinning effect. Additionally, the low local USFE promotes the nucleation and migration of kink pairs in screw dislocations. Furthermore, for the case of screw dislocation cross-slip, the irradiation hardening is alleviated as nonplanar kink pairs recede to the habit plane. These simulation results reveal the mesoscale internal mechanisms underlying anti-irradiation hardening in RHEAs. Based on these findings, mesoscale theoretical models describing dislocation motion and irradiation hardening are proposed, and they are verified experimentally. With these models, the irradiation hardening behavior of other RHEAs can be predicted. These findings can guide the design and preparation of advanced anti-irradiation RHEAs and contribute to the development of upscaled theoretical models and simulation methods.难熔高熵合金（RHEAs）具有优异的抗辐照性能，在先进核反应堆中具有广阔的应用前景。本研究采用分子静力学（MS）和分子动力学（MD）模拟方法研究了位移级联中初级敲原子（pka）诱导的RHEAs中的局部不稳定层错能（USFE）。基于这些原子模拟，采用随机统计方法建立了相场位错动力学（PFDD）模型，该模型考虑了化学成分波动和位移级联对RHEAs局部USFE的影响。利用该PFDD模型，研究了WTaCrV中边位错和螺位错的平面运动，以及螺位错的交叉滑移行为。结果表明：级联区能有效地钉住边缘位错，阻碍螺旋位错中扭对的成核，导致辐照硬化；然而，WTaCrV中化学成分波动导致的局部USFE较低，使得钉住位点附近的边缘位错段向外弯曲，拖拽钉住的位错段，降低钉住效果。此外，低局部USFE促进了螺位错中扭结对的成核和迁移。此外，对于螺位错交叉滑移的情况，非平面扭结对退至习惯面，减轻了辐照硬化。这些模拟结果揭示了RHEAs抗辐照硬化的中尺度内部机制。基于这些发现，提出了描述位错运动和辐照硬化的中尺度理论模型，并进行了实验验证。利用这些模型，可以预测其他RHEAs的辐照硬化行为。这些发现可以指导先进的抗辐照RHEAs的设计和制备，并有助于发展规模化的理论模型和仿真方法。Thin-Walled StructuresBallistic response behaviour of Dyneema® HB210 curved armour plates: An experimental and numerical studyDaniel Eckhoff, Susanne Thomesen, Ulrich Heisserer, Tore Børvikdoi:10.1016/j.tws.2025.113265Dyneema®HB210弯曲装甲板的弹道响应行为：实验和数值研究This study investigates the impact response behaviour of ultra-high-molecular-weight polyethylene (UHMWPE) composites, specifically Dyneema® HB210, used in curved hard armour plates produced by NFM Technology AS (NFM). The research offers a better understanding of the deformation behaviour and failure mechanisms of these composites under ballistic impact through experimental testing and numerical simulations. Ballistic impact tests utilised 7 . 62 × 39 mm PS rounds, featuring in-situ deformation measurements using high-speed cameras combined with 3D Digital Image Correlation (3D-DIC) to capture high-resolution deformation data and backface deformation (BFD). To replicate human body impacts and measure BFD, plates were also tested with Roma Plastilina No. 1 clay backing. A new fibre-matrix-based constitutive model was applied in the IMPETUS Solver, making it the first time of Dyneema® HB210 being fitted to such a model. Numerical simulations, calibrated via inverse modelling, demonstrated good agreement with experimental results, capturing ballistic limit velocity, deformations, and failure mechanisms. The maximum BFD discrepancy between simulations and 3D-DIC measurements was 3.6%. The use of clay backing in experiments was effectively simulated, replicating the primary mechanisms observed during the ballistic impact tests. Future work should focus on conducting more experimental tests, refining material models and performing parametric studies.本研究研究了超高分子量聚乙烯（UHMWPE）复合材料的冲击响应行为，特别是用于NFM Technology AS （NFM）生产的弯曲硬装甲板的Dyneema®HB210。通过实验测试和数值模拟，为进一步了解复合材料在弹道冲击下的变形行为和破坏机制提供了理论依据。使用的弹道冲击试验62 × 39毫米PS弹，采用高速相机结合3D数字图像相关（3D- dic）进行现场变形测量，以捕获高分辨率变形数据和背面变形（BFD）。为了复 制人体冲击和测量BFD，还用Roma Plastilina 1号粘土衬底测试了板。在动力求解器中应用了一种新的基于纤维矩阵的本构模型，这是Dyneema®HB210首次适用于这种模型。通过反向建模校准的数值模拟结果与实验结果非常吻合，捕获了弹道极限速度、变形和破坏机制。仿真结果与3D-DIC测量值之间的最大BFD差异为3.6%。在实验中有效地模拟了粘土背衬的使用，复 制了在弹道冲击试验中观察到的主要机制。未来的工作应侧重于进行更多的实验测试，完善材料模型并进行参数研究。Mechanical response and damage mechanism of carbon/Kevlar hybrid braiding composite laminates under quasi-static indentation and low-velocity impact loadingMingling Wang, Lin Shi, Zhongxiang Pan, Zhenyu Wudoi:10.1016/j.tws.2025.113291准静态压痕和低速冲击载荷下碳/凯夫拉混杂编织复合材料层合板的力学响应及损伤机理The study explains the distinctions in the response and damage evolution of hybrid structures subjected to quasi-static indentation (QSI) and low-velocity impact (LVI) loading, and the toughening mechanism of Kevlar in enhancing the impact resistance of Carbon Fiber Reinforced Polymer (CFRP). It offers insights for the design of hybrid composites under QSI and LVI loading. The analysis encompasses an investigation of the discrepancies in energy absorption, damage area, and damage form for hybrid laminates with varying Kevlar hybrid ratios and interlayer sequences. Furthermore, the finite element models (FEM) and periodic indentation test were employed to elucidate the damage mechanisms of laminates under loading process. It is proposed that energy absorption can be employed as a reasonable indicator for the comparison of static and dynamic loading responses. As the ratio of toughness to Kevlar hybrid increases, the static energy absorption of hybrid laminates declines gradually, whereas the dynamic energy absorption rises. Compared to static loading, the damage of fibres and yarns is more pronounced under dynamic loading. The extent of impact damage in hybrid specimens is contingent upon the number and distribution of Kevlar layers. In static loading, damage propagated from the loading surface to the non-loading surface, ultimately leading to the failure of structure. In contrast, under dynamic loading, damage initiated on the surface not subjected to loading and propagated towards the loaded surface, ultimately leading to a similar outcome.分析了杂化结构在准静态压痕（QSI）和低速冲击（LVI）载荷作用下的响应和损伤演化特征，探讨了芳纶纤维（Kevlar）增强碳纤维增强聚合物（CFRP）抗冲击性能的增韧机理。为复合材料在QSI和LVI载荷下的设计提供了新的思路。分析了不同凯夫拉混合比率和层间序列的混合层合板在能量吸收、损伤面积和损伤形式方面的差异。此外，采用有限元模型和周期性压痕试验对层合板在加载过程中的损伤机理进行了分析。提出能量吸收可以作为比较静、动荷载响应的合理指标。随着复合材料韧性比的增加，复合材料的静态吸能逐渐下降，而动态吸能逐渐上升。与静态载荷相比，动态载荷对纤维和纱线的破坏更为明显。混杂试样的冲击损伤程度取决于凯夫拉层的数量和分布。在静力加载中，损伤从加载面向非加载面传播，最终导致结构破坏。相比之下，在动加载下，损伤始于未受加载的表面，并向加载表面传播，最终导致类似的结果。Novel CFS Truss with Stamped Diagonal SystemCleirton A.S. Freitas, Cheng Yu, Sai K. Nalladoi:10.1016/j.tws.2025.113295新型冲压对角体系CFS桁架This paper presents a novel technology for designing, manufacturing and assembling cold-formed 2D trusses. The concept is based on creating a connection where the axes of the webs are concentric (at the same point), thus not generating additional moments to the truss chord members and increasing the overall stability of the trusses. An original connection configuration was developed by stamping the flanges of the diagonal webs. This technology also allows the diagonal elements to be manufactured continuously, making assembly quick and precise. To verify the efficiency of this novel truss design, experimental tests and FE models were carried out, comparing five standard cold-formed trusses with the new truss. The experimental results showed that the new truss demonstrated higher strength and stiffness than the standard cold-formed steel trusses and could be a viable solution for floor and roof applications.本文提出了一种设计、制造和装配冷弯二维桁架的新技术。这个概念是基于创建一个连接，其中腹板的轴线是同心的（在同一点），因此不会产生额外的力矩桁架弦成员和增加桁架的整体稳定性。通过冲压斜腹板的法兰，开发了一种原始的连接结构。该技术还允许连续制造对角线元件，使组装快速和精确。为了验证这种新桁架设计的有效性，进行了试验测试和有限元模型，将5种标准冷弯桁架与新桁架进行了比较。试验结果表明，新型桁架比标准冷弯型钢桁架具有更高的强度和刚度，可以作为楼板和屋顶应用的可行解决方案。Dynamic compressive behaviour of multi-dimensional hybridized TPMS structureXiaonan Zhang, Xiangyu Xie, Shilin Yan, Yongjing Li, Yushuang Fang, Cheng Wang, Liang Kedoi:10.1016/j.tws.2025.113304多维杂化TPMS结构的动态压缩特性Triply periodic minimal surface (TPMS) lattices are widely used in aerospace, ballistic protection, and impact mitigation. Although numerous studies indicate that hybrid designs can improve the mechanical performance of TPMS structures, their effects on dynamic crushing and impact properties are still not well understood. This study integrates the mechanical characteristics of P and IWP unit cells to develop multi-dimensional (from 1D to 3D) hybrids using Sigmoid functions. Hybrid TPMS structures were produced from Al–Si10–Mg powder using the laser-based powder bed fusion (PBF–LB/M) technique. Their dynamic performance was evaluated through Split Hopkinson Pressure Bar (SHPB) tests, which validated finite element simulations within a 10% strain range. The numerical simulations then provided dynamic response results over a broader range. The results demonstrate that hybrid designs significantly enhance energy absorption, with hybrid direction or plane aligned parallel to the compression direction achieving higher specific energy absorption (SEA), while the plateau stress increases under vertical alignment. Among these, the Hyb-1D IWP–P–IWP showed the best performance under high-strain-rate conditions. Additionally, the Gibson-Ashby theory was used to predict SEA and plateau stress across different relative densities, and stress-strain responses revealed notable sensitivity to loading rates. These findings highlight the potential of hybrid TPMS designs to optimize dynamic energy absorption, offering promising applications in military and impact protection systems.三周期最小表面（TPMS）晶格广泛应用于航空航天、弹道防护和冲击缓解。尽管大量研究表明混合设计可以改善TPMS结构的力学性能，但其对动态破碎和冲击性能的影响仍未得到很好的理解。本研究利用Sigmoid函数整合P和IWP单晶胞的力学特性，开发多维（从1D到3D）杂交体。采用激光粉末床熔融（PBF-LB /M）技术制备了Al-Si10-Mg粉末的杂化TPMS结构。通过分离式霍普金森压杆（SHPB）试验评估了它们的动态性能，该试验验证了10%应变范围内的有限元模拟。数值模拟提供了更大范围内的动态响应结果。结果表明，混合设计显著提高了材料的能量吸收，与压缩方向平行的混合方向或混合平面具有较高的比能吸收（SEA），而垂直方向下的平台应力增加。其中，Hyb-1D IWP-P-IWP在高应变速率条件下表现最佳。此外，采用Gibson-Ashby理论预测不同相对密度下的SEA和高原应力，应力-应变响应对加载速率具有显著的敏感性。这些发现突出了混合TPMS设计优化动态能量吸收的潜力，在军事和冲击防护系统中提供了有前途的应用。High stable auxetic metamaterials developed through feature-control topology optimization and additive manufacturingHan Zhengtong, Zhou Yang, Xu Ze, Wei Kai, Zhao Jianhua, He Zhelong, He Gangdoi:10.1016/j.tws.2025.113305通过特征控制拓扑优化和增材制造开发出高稳定性的增生性超材料Auxetic metamaterials with stable deformation modes are essential in engineering applications to achieve desired functionalities, as otherwise they may incur irreversible damage, e.g., structural interference and collision damage. However, only a few works have proposed special architectures relying on inspiration and experience, meaning that their design and fabrication remain challenging due to the lack of a systematic method. Here, we propose a novel feature-control metamaterial topology optimization framework aimed at efficiently exploring auxetic metamaterials with high stability and manufacturability. By integrating the local volume fraction function and skeleton-based length scale function, the method effectively controls material distribution and minimum geometric size, preventing excessively slender features and unmanufacturable configurations. Specimens were fabricated using additive manufacturing, and experimental testing validated the mechanical properties, closely aligning with finite element analysis predictions. Results show that simply increasing the volume fraction in topology optimization to raise the relative density of auxetic metamaterials does not directly enhance stability. Instead, the novel designs effectively prevent instability by incorporating denser structures and localized internal ribs, which improve stiffness and overall load-bearing capacity, as confirmed by extensive simulations and experiments. This approach enhances the design efficiency of stable metamaterials and facilitates the development of advanced configurations, expanding the application of auxetic materials in protective engineering, aerospace, and civil engineering.具有稳定变形模式的辅助超材料在工程应用中是必不可少的，以实现所需的功能，否则它们可能会导致不可逆的损伤，例如结构干涉和碰撞损伤。然而，只有少数作品依靠灵感和经验提出了特殊的建筑，这意味着它们的设计和制造由于缺乏系统的方法而仍然具有挑战性。在此，我们提出了一种新的特征控制的超材料拓扑优化框架，旨在有效地探索具有高稳定性和可制造性的生长性超材料。该方法通过整合局部体积分数函数和基于骨架的长度尺度函数，有效地控制了材料分布和最小几何尺寸，避免了过于细长的特征和不可制造的结构。采用增材制造技术制作了样品，并进行了实验测试，验证了其力学性能，与有限元分析预测结果非常吻合。结果表明，单纯地通过拓扑优化提高体积分数来提高材料的相对密度并不能直接提高材料的稳定性。相反，新设计通过结合更密集的结构和局部的内肋，有效地防止了失稳，从而提高了刚度和整体承载能力，这一点得到了大量模拟和实验的证实。这种方法提高了稳定超材料的设计效率，促进了先进结构的发展，扩大了消声材料在防护工程、航空航天和土木工程中的应用。Multi-scale topology optimization for graded hollow lattice structures with variable wall thicknessZhengtao Shu, Kang Zhao, Hao Li, Liang Gaodoi:10.1016/j.tws.2025.113274 变壁厚梯度空心点阵结构的多尺度拓扑优化Considering the mechanical performance advantages of hollow truss-based lattice microstructures, this paper proposes a multi-scale topology optimization method for designing graded hollow lattice structures (GHLSs). The level set-based implicit representation method is used to construct hollow lattice microstructures with different configurations, and their mechanical properties are characterized using the asymptotic homogenization method. Compared to solid lattice microstructures, hollow lattice microstructures exhibit an improvement of at least 20% in total stiffness and over 15% in thermal conductivity. Subsequently, elasticity tensor scaling laws for the microstructures are constructed to avoid expensive iterative homogenization calculations during optimization. Based on these laws, multi-scale topology optimizations are performed considering the thermal conductivity and stiffness performance of the GHLS. The proposed hybrid level set method (HLSM) enables high-quality geometric reconstruction, ensuring the obtained GHLS have at least C° continuity. Finally, the thermal and stiffness performance of the GHLSs is compared and verified by finite element analysis (FEA) and experiments.考虑到基于空心桁架的晶格微结构的力学性能优势，提出了一种多级拓扑优化设计方法。采用基于水平集的隐式表示方法构造了具有不同构型的空心点阵微结构，并利用渐近均匀化方法对其力学性能进行了表征。与固体晶格微结构相比，空心晶格微结构的总刚度提高了至少20%，导热系数提高了15%以上。随后，建立了微观结构的弹性张量标度律，避免了优化过程中昂贵的迭代均匀化计算。基于这些规律，考虑了GHLS的导热性能和刚度性能，进行了多尺度拓扑优化。提出的混合水平集方法（HLSM）可以实现高质量的几何重建，确保获得的GHLS至少具有C°连续性。最后，通过有限元分析和实验对ghls的热性能和刚度性能进行了比较和验证。Structural reliability of the design of pallet-rack columns via Direct Strength MethodVictor A.M. Faria, Marcílio S.R. Freitas, André L.R. Brandãodoi:10.1016/j.tws.2025.113294基于直接强度法的托盘架柱结构可靠性设计Rack columns are among the various structural components that compose pallet-rack storage systems. These columns possess complex geometries and hole patterns, making strength prediction challenging. Most design codes for pallet-rack structures rely on experimental tests to support strength prediction for the columns, while semi-analytical methods, such as the Direct Strength Method (DSM), have become predominant in the design of cold-formed steel members in compression. This paper evaluates the safety of rack column designs using adaptations of the DSM. The reliability analysis was based on reliability indices calculated through first order reliability analysis and Monte Carlo Simulation (MCS). Load combinations were selected from the ANSI MH16.1 (LRFD), AISI S100/NBCC (LSD), and NBR 15524-2 standards to assess whether the design using the selected adaptations meets the target reliability indices across a selected range of product-to-dead load ratios. The seven pure semi-analytical adaptations did not achieve the target reliability values. Only methodologies employing the Reduced Thickness Method met the target for certain limit state. These methodologies were still imprecise for the local-global buckling limit state, necessitating the calibration of new resistance factors for potential future adoption in standards such as ANSI MH16.1 and NBR 15524-2.货架柱是组成托盘货架存储系统的各种结构部件之一。这些柱具有复杂的几何形状和孔模式，使强度预测具有挑战性。大多数托盘架结构的设计规范依赖于实验测试来支持柱的强度预测，而半解析方法，如直接强度法（DSM），在冷弯型钢受压构件的设计中占主导地位。本文采用DSM对机架柱设计的安全性进行了评价。可靠性分析基于一阶可靠性分析和蒙特卡罗仿真（MCS）计算的可靠性指标。从ANSI MH16.1 (LRFD), AISI S100/NBCC （LSD）和NBR 15524-2标准中选择负载组合，以评估使用所选适应性的设计是否在选定的产品与恒载比范围内满足目标可靠性指标。七个纯半分析适应没有达到目标可靠性值。只有采用减厚法的方法才能满足某些极限状态的目标。这些方法对于局部-全局屈曲极限状态仍然不精确，需要校准新的阻力因子，以便将来在ANSI MH16.1和NBR 15524-2等标准中采用。来源：复合材料力学仿真Composites FEM
