【新文速递】2024年4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，Mechanics of Materials 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 3 篇International Journal of Solids and StructuresFrictional slippage of elastomeric disks compressed between rigid platens and subjected to torsionRaymond H. Plaut, David A. Dillarddoi:10.1016/j.ijsolstr.2024.112807压缩在刚性压盘之间并受到扭转的弹性盘的摩擦滑移A new analysis is applied to compressible, linearly elastic disks that are compressed by flat rigid platens. The disks are not bonded to the platens and Coulomb (Amonton) friction is assumed to act at the interfaces between the disk and the platens. Slip may occur in an outer annular region, while the inner circular (stick) region of the disk does not slip. The critical radius (slip boundary) is of major interest. The governing equilibrium equations in terms of the deflections are satisfied exactly. Approximations are made in some of the boundary conditions and the transition (matching) conditions at the critical radius. Numerical results are presented for nearly incompressible disks, both for (a) compression only and (b) compression plus torsion. In the latter case, during twisting, either the compressed thickness of the disk is fixed while the compressive force varies, or the compressive force is fixed while the thickness varies. The effects of the aspect ratio and Poisson's ratio of the disk, the coefficient of friction at the platens, and the twist angle on the critical radius, stresses, compressive force, torque, and effective compression and shear moduli are investigated. Applications include structural (especially bridge) bearings, seismic-isolation devices, mounting blocks and bushings, and rheometry.一种新的分析方法适用于被平面刚性压盘压缩的可压缩线性弹性圆盘。圆盘与压盘没有粘合，假设库仑（阿蒙顿）摩擦力作用于圆盘与压盘之间的界面。滑动可能发生在外部环形区域，而圆盘的内部圆形（棒状）区域不会发生滑动。临界半径（滑移边界）是主要关注点。以挠度为单位的支配平衡方程是精确满足的。对临界半径处的一些边界条件和过渡（匹配）条件进行了近似处理。针对几乎不可压缩的磁盘，给出了 (a) 仅压缩和 (b) 压缩加扭转的数值结果。在后一种情况下，在扭转过程中，要么圆盘的压缩厚度固定而压缩力变化，要么压缩力固定而厚度变化。研究了圆盘的长宽比和泊松比、压盘处的摩擦系数以及扭转角度对临界半径、应力、压缩力、扭矩以及有效压缩和剪切模量的影响。应用领域包括结构（尤其是桥梁）支座、地震隔离装置、安装块和衬套以及流变测量。Mechanics of MaterialsOn the role of higher-order condition of strain gradient plasticity in the cyclic torsion of thin metallic wires: Experiments and modelingYuyang Xie, Jian Lei, Jiongjiong Hu, Tong Luo, Chaoxiang Ma, Dabiao Liu, Yuming Hedoi:10.1016/j.mechmat.2024.105007应变梯度塑性的高阶条件在金属细线循环扭转中的作用：实验与建模Cyclic torsion tests are performed on micron-scale copper wires with and without surface passivation to study the role of the higher-order condition in the plastic behavior of thin wires under non-proportional loading. A typical strengthening size effect is observed in the symmetric cycles. More obvious strength enhancement exists in the torsional response of passivated copper wires. An unusual Bauschinger effect is found during the loading-unloading cycles, which is more pronounced in passivated wires. The finite element implementation based on Gudmundson’s strain gradient plasticity theory is developed for wire torsion to characterize the observed size-dependent phenomena. The higher-order boundary conditions are introduced to simulate the passivated surface. The predicted radial distributions of plastic strain, stress components, and geometrically necessary dislocation density for the passivated and unpassivated wires are given and compared. This work provides a reasonable basis for understanding the role of higher-order conditions of strain gradient plasticity.在有表面钝化和无表面钝化的微米级铜线上进行了循环扭转试验，以研究高阶条件在非比例载荷下细线塑性行为中的作用。在对称循环中观察到了典型的强化尺寸效应。在钝化铜线的扭转响应中存在更明显的强度增强。在加载-卸载循环中发现了一种不寻常的鲍辛格效应，这种效应在钝化铜线中更为明显。基于 Gudmundson 的应变梯度塑性理论，针对线材扭转开发了有限元实现方法，以描述观察到的尺寸相关现象。为模拟钝化表面，引入了高阶边界条件。对钝化和未钝化线材的塑性应变、应力分量和几何必要位错密度的径向分布进行了预测和比较。这项工作为理解应变梯度塑性的高阶条件的作用提供了合理的基础。International Journal of PlasticitySurface roughness evolution and heterogeneous plastic deformation of austenitic stainless steel during micro deep drawing: Modeling and experimentHang Zhao, Xiaoguang Ma, Zhihua Wang, Zhengyi Jiang, Cunlong Zhou, Jingwei Zhaodoi:10.1016/j.ijplas.2024.103964奥氏体不锈钢在微深冲过程中的表面粗糙度演变和异质塑性变形：建模与实验The present work involves the numerical simulation and experimental study on the surface roughness evolution and heterogeneous plastic deformation (strain localization and concomitant surface morphology evolution) in grain scale of micro deep drawn parts of austenitic stainless steel (ASS) 304 foils. A three-dimensional modeling framework was used to simulate the micro drawing deepening (MDD) process. The simulation involved the development of a Voronoi-based polycrystalline geometry model (VPGM), a multi-stress-strain response model, and a crystal plasticity finite element method (CPFEM) model. The results indicate that CPFEM model exhibits higher accuracy in the localized stress and strain, thickness distribution fluctuation and surface roughness evolution of the fabricated parts compared to multi-stress-strain response model. Therefore, the plastic deformation heterogeneity in MDD is in-depth discussed based on CPFEM model. The results show that the coarse-grained foils correspond to the intense strain localization, which is the main cause of surface roughening. Considering the average size is close to the thickness of ASS foils, mounding features on the rough surface may readily develop further into potentially fractured sites during deformation. On the other hand, crystal orientation influence plastic deformation by affecting the slip behavior of materials. The effect of crystal orientations including {011} <211> (Brass), {011} <100> (Goss), and {112} <110> components on deformation is discussed. The results indicate a strong correlation between the magnitude of the Schmid's factor and the ease of deformation. Additionally, variations in Schmid's factor across different directions result in differences in deformation accumulation, which affects the thickness distribution along the radial direction and the distribution of earrings and wrinkles along the circumferential direction of the fabricated micro parts.本研究涉及奥氏体不锈钢（ASS）304 薄膜微拉伸部件晶粒尺度表面粗糙度演变和异质塑性变形（应变局部化和伴随的表面形态演变）的数值模拟和实验研究。采用三维建模框架来模拟微拉深（MDD）过程。模拟包括开发基于 Voronoi 的多晶几何模型 (VPGM)、多应力应变响应模型和晶体塑性有限元法 (CPFEM) 模型。结果表明，与多应力应变响应模型相比，CPFEM 模型在加工件的局部应力和应变、厚度分布波动和表面粗糙度演变方面表现出更高的精度。因此，基于 CPFEM 模型对 MDD 中的塑性变形异质性进行了深入探讨。结果表明，粗晶粒箔对应于强烈的应变局部化，这是表面粗糙化的主要原因。考虑到平均尺寸接近 ASS 箔的厚度，粗糙表面上的丘状特征很容易在变形过程中进一步发展成为潜在的断裂点。另一方面，晶体取向会影响材料的滑移行为，从而影响塑性变形。晶体取向的影响包括 {011} <211> (黄铜)、{011} <211> (黄铜)<211> (黄铜)、{011} <100> (高斯)<100>（高斯）和 {112} <110> 成分对变形的影响。<110> 成分对变形的影响进行了讨论。结果表明，施密特因子的大小与变形的难易程度之间存在很强的相关性。此外，不同方向上 Schmid 因子的变化会导致变形累积的差异，从而影响到沿径向的厚度分布以及沿圆周方向的耳环和皱纹分布。Thin-Walled StructuresA comparative study on ballistic performance of 3D woven fabrics under different boundary conditionsMengqi Yuan, Hao Wu, Xing Li, ShaoBo Qi, JiaCheng Lidoi:10.1016/j.tws.2024.111865不同边界条件下三维编织物弹道性能的比较研究The potential of 3D woven fabrics as impact resistant material is increasingly recognized. Clarifying their ballistic response under varying boundary conditions is essential prior to deployment. This study aims to investigate the influence of various boundary conditions on the ballistic performance of 3D woven fabrics. Three aramid interlock woven fabrics, each with the same layer count, were designed and fabricated. A verified finite element model of ballistic impact at the yarn level was constructed for a comprehensive analysis. The influence of various boundary conditions on ballistic performance, including ballistic curve, stress distribution, back deformation, and energy absorption, is analyzed. It indicates that boundary conditions significantly affect the impact resistance and response mechanism of the fabrics. Among the different conditions, the fabric under Warp-sides held exhibits greater sensitivity. In the study, the fabric with vertical through-thickness warp yarn structure has smaller out-of-plane displacement, while the fabric with a multi-layer warp yarn structure exhibits better stability in energy absorption performance. The study investigates the response and performance of fabric configurations subject to various boundary conditions, and findings are valuable for the creation of 3D woven fabric designs that leverage boundary effects.人们越来越认识到三维编织物作为抗冲击材料的潜力。在部署之前，明确其在不同边界条件下的弹道响应至关重要。本研究旨在调查各种边界条件对三维编织物弹道性能的影响。研究人员设计并制造了三种芳纶交错编织物，每种编织物的层数相同。在纱线层面构建了一个经过验证的弹道冲击有限元模型，以进行综合分析。分析了各种边界条件对弹道性能的影响，包括弹道曲线、应力分布、背面变形和能量吸收。结果表明，边界条件对织物的抗冲击性能和响应机制有明显影响。在不同条件下，经向夹持的织物表现出更大的敏感性。在研究中，垂直通厚经纱结构的织物具有较小的平面外位移，而多层经纱结构的织物在能量吸收性能方面表现出更好的稳定性。该研究调查了织物配置在各种边界条件下的响应和性能，研究结果对利用边界效应创建三维编织物设计很有价值。Review on hypervelocity impact of advanced space debris protection shieldsYing Chen, Qun-yi Tang, Qi-guang He, Lv-tan Chen, Xiao-wei Chendoi:10.1016/j.tws.2024.111874先进空间碎片保护罩的超高速撞击审查Spacecraft employ space debris protection shields to mitigate the threat of hypervelocity impact (HVI) from millimeter-sized (envisioned in centimeters) hazardous space debris. Advancements in protection shields have primarily leveraged high-performance materials, such as high-performance fiber composites, multifunctional impedance gradient materials, and metallic honeycombs and foams, to enhance their protective capabilities. This paper provides a comprehensive overview of advanced space debris protection shields for HVI, covering the design and optimization of protective materials or structures, properties of debris clouds, phase transition issues of debris clouds, and numerical simulation techniques. Finally, to address the current research deficiencies considering the latest practical developments in space debris protection engineering, it is essential to propose engineering science research. These are important for enhancing the safety, stability, and longevity of spacecraft.航天器采用空间碎片保护罩来减轻毫米级（设想为厘米级）危险空间碎片的超高速撞击威胁。保护罩的进步主要是利用高性能材料，如高性能纤维复合材料、多功能阻抗梯度材料以及金属蜂窝和泡沫，来增强其保护能力。本文全面概述了用于高空变轨器的先进空间碎片防护罩，内容包括防护材料或结构的设计与优化、碎片云的特性、碎片云的相变问题以及数值模拟技术。最后，考虑到空间碎片保护工程的最新实际发展情况，为解决当前研究的不足，有必要提出工程科学研究。这些对于提高航天器的安全性、稳定性和寿命都很重要。Multiple ballistic impacts of UHMWPE fiber metal laminates: Experiments and simulationsChang-ye Ni, Jian-hong Zhang, Lu-sheng Qiang, Bing-qian Zheng, Zhen- yu Zhao, Jian Deng, Feng Chen, Rui Zhangdoi:10.1016/j.tws.2024.111875超高分子量聚乙烯纤维金属层压板的多重弹道冲击：实验与模拟Fiber metal laminate (FML) has demonstrated great potential as a multifunctional structure with ballistic resistance capabilities. Typical projectile weapons, such as sub-machine guns or machine guns equipped with 7.62 mm ammunition, can cause multiple impacts at various locations. However, the specific behavior of FML under multiple ballistic impacts has remained unclear. To address this gap, a comprehensive investigation was conducted to explore the ballistic performance of FML under multiple impacts by a combined experimental and numerical method. The FML composed of two steel layers and one UHMWPE composite layer was subjected to both single and double impact tests. Cylindrical blunt projectiles with a caliber of 7.62 mm were utilized, with impact velocities ranging from 200 to 400 m/s. By adjusting the position of clamping fixture and keeping the projectile trajectory constant, a horizontal offset of 15 mm was set between the locations of the first and second impacts. Additionally, three-dimensional finite element simulations were employed to elucidate the penetration mechanisms of FML. The results revealed that the damage and failure caused by the first impact had minimal influence on the subsequent ballistic performance, and a consistent resistance against penetration under multiple ballistic impacts could be maintained when the spacing distance between impact points was greater than 15 mm. However, when the spacing distance was reduced, the residual velocities of FML under the three impacts gradually increased. As the velocity of the first impact was gradually increased while keeping the velocity of the second impact constant and above the ballistic limit, tearing cracks were observed to occur on the rear steel sheet of FML plate and then propagated between the penetrated holes, leading to a larger-scale failure area. Moreover, for interval time between impacts greater than 100 μs, there was no significant effect on the residual velocity of the projectiles.金属纤维层压板（FML）作为一种具有抗弹能力的多功能结构，已显示出巨大的潜力。典型的弹丸武器，如配备 7.62 毫米弹药的冲锋枪或机枪，可在不同位置造成多次撞击。然而，FML 在多重弹道冲击下的具体行为仍不清楚。针对这一空白，我们采用实验和数值相结合的方法对 FML 在多重冲击下的弹道性能进行了全面研究。对由两层钢和一层超高分子量聚乙烯复合材料组成的 FML 进行了单次和多次冲击试验。试验采用了口径为 7.62 毫米的圆柱形钝弹，冲击速度为 200 至 400 米/秒。通过调整夹具位置并保持弹丸轨迹不变，在第一次和第二次撞击位置之间设置了 15 毫米的水平偏移。此外，还采用了三维有限元模拟来阐明 FML 的穿透机制。结果表明，当撞击点之间的间距大于 15 毫米时，第一次撞击造成的破坏和失效对后续弹道性能的影响很小，而且在多次弹道撞击下仍能保持稳定的抗穿透能力。然而，当间距减小时，FML 在三次撞击下的残余速度逐渐增加。当第一次撞击的速度逐渐增大，而第二次撞击的速度保持不变且高于弹道极限时，在 FML 板的后部钢板上观察到撕裂裂纹，然后在穿透孔之间扩展，导致更大范围的破坏区域。此外，当撞击间隔时间大于 100 μs 时，对射弹的残余速度没有显著影响。来源：复合材料力学仿真Composites FEM