【新文速递】2025年3月21日固体力学SCI期刊最新文章

今日更新：Mechanics of Materials 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 3 篇Mechanics of MaterialsAtomic-scale interfacial strengthening mechanism of nano intermetallic compounds in Ti-Ni bimetallic alloysHao Li, ZhiFeng Huang, DaQian Xu, Qiang Shen, Fei Chendoi:10.1016/j.mechmat.2025.105329纳米金属间化合物在Ti-Ni双金属合金中的原子界面强化机制It is well established that cracking induced by Ti-Ni intermetallic compounds (IMCs) severely compromises the application of Ti-Ni bimetallic alloys in extreme environments. However, recent research has demonstrated that reducing the size of these originally detrimental IMCs from the micrometer to the nanometer scale can enhance the plasticity and strength of the metal. To investigate the effects of nanoscale IMCs on the deformation mechanisms of Ti-Ni bimetallic alloys under high strain, we employed molecular dynamics (MD) simulations to study the mechanical deformation mechanisms of two common IMCs at the interface of Ti-Ni bimetallic alloys, namely Ti2Ni and TiNi3, and their influence on the interfacial bonding strength of the alloy. Both lamellar and particulate configurations were considered.The results of uniaxial tensile tests reveal that Ti2Ni undergoes atomic-scale rearrangement after yielding, exhibiting high ductility but low strength. In contrast, TiNi3 is highly brittle and exhibits limited slip. In the context of Ti-Ni bimetallic alloys, the interface between lamellar Ti2Ni and the Ti layer is highly susceptible to stress concentration due to the lack of long-range order in the Ti2Ni structure. The semi-coherent interface between lamellar TiNi3 and the Ti layer is the primary cause of brittleness at the Ti-Ni interface. Additionally, the presence of particulate IMCs acts as dislocation sources, activating slip in the Ni layer, thereby enhancing overall plasticity at the expense of some strength.Our simulation work provides a potential approach for designing high-performance Ti-Ni bimetallic alloys and elucidates the deformation mechanisms of Ti2Ni and TiNi3 within the alloy matrix.Ti-Ni金属间化合物（IMCs）引起的裂纹严重影响了Ti-Ni双金属合金在极端环境中的应用。然而，最近的研究表明，将这些原本有害的imc的尺寸从微米级减小到纳米级可以提高金属的塑性和强度。为了研究纳米IMCs对高应变下Ti-Ni双金属合金变形机制的影响，采用分子动力学（MD）模拟研究了Ti-Ni双金属合金界面上常见的两种IMCs （Ti2Ni和TiNi3）的力学变形机制，以及它们对合金界面结合强度的影响。考虑了层状和颗粒结构。单轴拉伸试验结果表明，屈服后Ti2Ni发生了原子尺度的重排，表现出高延展性和低强度。相比之下，TiNi3是高度脆性的，表现出有限的滑移。在Ti- ni双金属合金中，由于Ti2Ni结构中缺乏长程有序，层状Ti2Ni与Ti层之间的界面极易受到应力集中的影响。层状tin3与Ti层之间的半相干界面是导致Ti- ni界面脆性的主要原因。此外，颗粒IMCs的存在作为位错源，激活Ni层中的滑移，从而以牺牲一定强度为代价提高整体塑性。我们的模拟工作为设计高性能Ti-Ni双金属合金提供了一种潜在的方法，并阐明了Ti2Ni和TiNi3在合金基体中的变形机制。International Journal of PlasticityUnderstanding the influence of high-strength submicron precipitate on the fracture performance of additively-manufactured aluminum alloyLi Cao, Renyi Lu, Zheng Dou, Min Zheng, Xiao Han, Yu Hao, Li Zhang, Jinfang Zhang, Bin Liu, Xiaofeng Lidoi:10.1016/j.ijplas.2025.104306 了解高强度亚微米析出物对增材铝合金断裂性能的影响The formation of intermetallic compound has been widely considered as an effective strengthening approach in Al alloy. Its precipitate dimension is a key factor influencing the mechanical performance. Except for the pinning effect of nanosized precipitate, the contribution of submicron precipitate is also nonnegligible. Therefore, establishing the mechanism framework for the relationship of manufacturing process-precipitate structure-fracture performance is of great significance, which is essential and foundational for optimizing the practical service performance of alloys parts. Herein, by taking the Al-Cu-Ni series alloy (e.g. RR350) as background, the study reveals the microstructure evolution of high-strength submicron Al7Cu4Ni precipitate from fabrication (additive manufacturing-heat treatment) to failure, and its influence mechanism on the fracture behavior. Through the microstructure regulation, a high elongation rate of ∼28.5% and slightly-deteriorated ultimate tensile strength of ∼305.2 MPa are achieved. The in-situ and ex-situ characterizations are employed to analyze the synergy mechanism of strength-ductility performance. Some novel findings are obtained that the submicron grain-boundary precipitates can interrupt the intergranular crack by influencing the stress status, thus decreasing the crack propagation rate and altering its propagation pathways. The entangled dislocation also presents an obstruction impact on the intragranular crack extension by its hardening effect. Moreover, the submicron Al7Cu4Ni precipitates with high bonding strength can withstand the concentrated stress to maintain a stable structure during alloy fracture, meanwhile present a strengthening effect on α-Al matrix to ameliorate the deterioration of tensile strength. The characterization of dislocation and microcrack evolution, provides direct evidence to the mechanism framework above, and could also provide insights into the strength-ductility coordination for other Al alloys.金属间化合物的形成被广泛认为是一种有效的强化方法。其析出物尺寸是影响其力学性能的关键因素。除了纳米析出物的钉住作用外，亚微米析出物的贡献也是不可忽略的。因此，建立制造工艺-析出组织-断裂性能关系的机理框架具有重要意义，是优化合金零件实际使用性能的必要基础。本研究以Al-Cu-Ni系列合金（如RR350）为背景，揭示了高强度亚微米Al7Cu4Ni析出物从制备（增材制造-热处理）到失效的组织演变及其对断裂行为的影响机制。通过组织调控，获得了高达28.5%的高伸长率和略变的极限抗拉强度，达到了305.2 MPa。采用原位和非原位表征分析了强度-延性协同机理。研究发现，亚微米晶界析出物可以通过影响应力状态来中断晶间裂纹，从而降低裂纹扩展速率，改变裂纹扩展路径。缠结位错的硬化作用对裂纹扩展也有阻碍作用。亚微米级的Al7Cu4Ni相具有较高的结合强度，能够承受合金断裂过程中的集中应力，保持组织稳定，同时对α-Al基体具有强化作用，改善了抗拉强度的劣化。位错和微裂纹演化的表征，为上述机制框架提供了直接证据，也可以为其他铝合金的强度-塑性配位提供参考。Thin-Walled StructuresA stochastic multiscale asymptotic homogenization approach to 3D printed biodegradable resin TPMS bio-inspired structuresTien-Dat Hoang, Thinh H. Ngo, Kim Q. Tran, Shaofan Li, H. Nguyen-Xuandoi:10.1016/j.tws.2025.1131003D打印生物可降解树脂TPMS仿生结构的随机多尺度渐近均质化方法Gyroid (G), Primitive (P), and IWP porous structures, belonging to the category of complex triply periodic minimal surface (TPMS) architectures, exhibit diverse applications across various physical domains. These intricately designed structures, inspired by biological architectures, are increasingly gaining attention in 3D printing because they fulfill the biological and mechanical requirements necessary for natural reconstruction. This paper promotes a novel computational framework for TPMS structures using a stochastic multiscale homogenization (SMH) method, which not only effectively predicts the homogenized engineering constants, microscopic strains, and damage propagation, but also accounts for their natural uncertainties. For computing a nonlinear problem on a standard desktop computer, the preconditioned element-by-element scaled conjugate gradient (EBE-SCG) method has been used to solve these stochastic models, particularly for intricate TPMS structures. To demonstrate the effectiveness of the present approach, the behaviors of the three above TPMS types with different layer levels, ranging from one to three within the same cell size, are automatically designed, formulated, and analyzed using an in-house Fortran code. This is a first attempt to demonstrate that the simulated stochastic homogenization predictions closely align with the experimental compressive Young’s modulus and damage behaviors of 3D-printed TPMS specimens made from a biodegradable resin, polyamide (PLA), using a vat photopolymerization printing process. The relative errors in the mean values, ranging from 2.45 to 11.25%, are attributed to uncertainties in the printed models involving small uncertainties. Notably, the stochastic approach effectively captures both the uncertainty and the probabilistic nature of the mechanical properties, with measured values falling within the predicted distributions. Moreover, this research framework enables more efficient design and fabrication of TPMS-based bio-inspired structures with potential applications in mechanical, civil, aerospace, engineering, etc., especially biomedical engineering.Gyroid (G), Primitive (P)和IWP多孔结构属于复杂三周期最小表面（TPMS）结构的范畴，在不同的物理领域表现出不同的应用。这些错综复杂的设计结构受到生物建筑的启发，在3D打印中越来越受到关注，因为它们满足了自然重建所需的生物和机械要求。本文提出了一种基于随机多尺度均质化（SMH）方法的TPMS结构计算框架，该框架不仅能有效预测均质化后的工程常数、微观应变和损伤扩展，还能考虑其自然不确定性。为了在标准台式计算机上计算非线性问题，本文采用预条件逐单元缩放共轭梯度（EBE-SCG）方法来求解这些随机模型，特别是复杂的TPMS结构。为了证明当前方法的有效性，使用内部Fortran代码自动设计、制定和分析具有不同层级别的上述三种TPMS类型（在相同单元大小中从一到三个）的行为。这是首次尝试证明模拟的随机均质化预测与实验压缩杨氏模量和使用还原光聚合打印工艺由可生物降解树脂聚酰胺（PLA）制成的3d打印TPMS样品的损伤行为密切相关。平均值的相对误差在2.45% ~ 11.25%之间，主要是由于印刷模型的不确定性，不确定性较小。值得注意的是，随机方法有效地捕获了机械性能的不确定性和概率性质，测量值落在预测分布范围内。此外，该研究框架能够更有效地设计和制造基于tpms的生物启发结构，在机械，土木，航空航天，工程等领域具有潜在的应用，特别是生物医学工程。Simultaneous topology, configuration, and prestress optimization for lightweight design of modular tensegrity chain structuresYongcan Dong, Xingfei Yuan, Xin Wang, Akram Samy, Shuo Ma, Shilin Dongdoi:10.1016/j.tws.2025.113184模块化张拉整体链结构轻量化设计的同步拓扑、配置和预应力优化Lightweight design has emerged as a valuable research focus in tensegrity structures, gaining increasing attention across various engineering domains that prioritize weight reduction. While many existing studies have concentrated on the lightweight design of conventional tensegrity structures, relatively little attention has been paid to those derived from modular assembly. This study focuses on a specific type of modular tensegrity chain structure (TCS) and presents a comprehensive framework for its lightweight design. The proposed framework innovatively integrates three critical design aspects: prestress determination, configuration design, and topology optimization, while simultaneously accounting for various design constraints under both prestress and load states. This framework is formulated as a bilevel optimization model. Prestress optimization is first performed at the internal level and then incorporated into the external-level model for configuration design and topology optimization. Subsequently, improved hybrid algorithms are also introduced to solve the optimization problem. Three representative numerical examples are provided to validate the effectiveness of the proposed framework and solving algorithms. The results demonstrate that this comprehensive approach achieves significant mass reduction compared to single-aspect designs. The proposed framework offers a more holistic and efficient solution for lightweight TCS design, showcasing its potential for enhancing the performance and efficiency of modular tensegrity structures in engineering applications.轻量化设计已经成为张拉整体结构的一个有价值的研究热点，在各个优先考虑减重的工程领域得到越来越多的关注。虽然许多现有的研究都集中在传统的张拉整体结构的轻量化设计上，但相对较少的关注来自模块化装配的轻量化设计。本研究的重点是一种特定类型的模块化张拉整体链结构（TCS），并提出了其轻量化设计的综合框架。该框架创新性地集成了三个关键设计方面：预应力确定、配置设计和拓扑优化，同时考虑了预应力和载荷状态下的各种设计约束。该框架被表述为一个双层优化模型。首先在内部进行预应力优化，然后将预应力优化纳入外部模型进行结构设计和拓扑优化。随后，引入了改进的混合算法来解决优化问题。最后给出了三个典型的数值算例，验证了所提框架和求解算法的有效性。结果表明，与单面设计相比，这种综合方法实现了显著的质量减少。提出的框架为轻型TCS设计提供了更全面、更有效的解决方案，展示了其在工程应用中提高模块化张拉整体结构性能和效率的潜力。Experimental and numerical study on lateral-torsional buckling of welded QN1803 high-strength stainless steel I-girdersYoutian Wang, Boshan Chen, Peng Dai, Yuanqing Wang, Yuchen Song, Ke Jiang, Letian Haidoi:10.1016/j.tws.2025.113190焊接QN1803高强不锈钢工字梁侧扭屈曲试验与数值研究Recently, high-strength stainless steel, known as QN1803, has gained popularity in the steel industry due to its lower nickel content, approximately 2.0%, which makes it more cost-effective than traditional EN 1.4401 stainless steel. The moment capacities of such thin-walled I-girders are influenced by lateral-torsional buckling (LTB) when they are not laterally restrained adequately. However, existing studies have not yet investigated the lateral-torsional buckling behaviour of such I-girders. This issue is addressed in this study. An experimental program was conducted, reporting a total of six experimental results. Traditional four-point bending tests were performed to measure the displacement versus load relationship at the mid-span. An advanced numerical model considering the initial geometric imperfection and residual stresses was established and calibrated against the test results the authors and other researchers reported. Subsequently, a parametric study including 66 FE models was undertaken. The test results indicated that the lateral-torsional buckling strength of QN1803 high-strength stainless steel I-girders increased by 27% on average compared to commonly used EN 1.4401 stainless steel. The obtained test and parametric study results were further used to evaluate the design methods outlined in Australian Standard AS4100 (2016), European code (EN 1993-1-1) (2022) and AISC 360-22 (2022). The comparison revealed that the current design specifications are inadequate for accurately predicting the lateral-torsional buckling strength of such I-girders.最近，被称为QN1803的高强度不锈钢因其较低的镍含量（约2.0%）而在钢铁行业中受到欢迎，这使得它比传统的EN 1.4401不锈钢更具成本效益。当横向约束不充分时，这种薄壁工字梁的弯矩承载力会受到侧向扭转屈曲的影响。然而，现有的研究尚未对这种工字梁的侧向扭转屈曲行为进行研究。这一问题在本研究中得到了解决。进行了实验程序，共报告了6个实验结果。传统的四点弯曲试验是为了测量跨中位移与荷载的关系。建立了考虑初始几何缺陷和残余应力的先进数值模型，并根据作者和其他研究人员报道的试验结果进行了校准。随后，对66个有限元模型进行了参数化研究。试验结果表明，QN1803高强不锈钢工字梁的侧扭屈曲强度比常用的EN 1.4401不锈钢平均提高27%。获得的试验和参数研究结果进一步用于评估澳大利亚标准AS4100(2016)，欧洲规范（EN 1993-1-1）（2022）和AISC 360-22（2022）中概述的设计方法。比较表明，目前的设计规范不足以准确预测工字梁的侧扭屈曲强度。来源：复合材料力学仿真Composites FEM