【新文速递】2025年2月22日复合材料SCI期刊最新文章_ACT_Mechanical_Optical_System_HPC_Inspire_疲劳_复合材料_化学_光学_航空_航天_裂纹_爆炸_材料_试验

【新文速递】2025年2月11日固体力学SCI期刊最新文章

今日更新：Journal of the Mechanics and Physics of Solids 1 篇，Thin-Walled Structures 1 篇Journal of the Mechanics and Physics of SolidsMechanics of liquid crystal inclusions in soft matricesYifei Bai, Laurence Brassartdoi:10.1016/j.jmps.2025.106070软基质中液晶夹杂物的力学研究The mechanical behaviour of composites of liquid crystal inclusions embedded in soft matrices involves a complex interplay between the elasticity of the matrix, the surface elasticity of the interfaces, and the reorientation of the liquid crystal molecules. Directors of the (nematic) liquid crystal tend to be aligned in the bulk, but may ”anchor” along the interface. In addition, the interface deforms according to the bulk deformation, while trying to minimise the surface area. In this paper, we present a continuum theory for an incompressible hyperelastic matrix containing nematic liquid crystal inclusions. The elastic energy of the inclusions, attributed to the distortion of the director field, is described using Landau-de Gennes theory. The matrix is described as an incompressible neo-Hookean solid. Anchoring effects at the inclusion–matrix interface are described through anisotropic surface tension. The model is implemented numerically using the FEniCSx finite element code. Through parametric study, we investigate the impact of energy competitions on the macroscopic and inclusion responses. Similar to the case of liquid inclusions, composites containing liquid crystal inclusions can be stiffer or softer than the matrix, depending on the value of the elasto-capillary number. The softening or stiffening effect is further affected by the distortional energy of the inclusion and the anchoring strength of the interface. Conversely, applied mechanical loads can reorient the director field. In particular, we show that stress-induced reorientation is significant when the dimensionless volume of the inclusion is large, involving alignment of the directors under tension, and disorientation under compression. The proposed theory and new physical insights could be useful for the design of smart stimuli-responsive materials.嵌入软基质中的液晶包裹体复合材料的力学行为涉及基质弹性、界面表面弹性和液晶分子重定向之间的复杂相互作用。（向列）液晶的导向器趋向于在整体上排列，但可能沿着界面“锚定”。此外，界面根据体变形变形，同时尽量减少表面积。本文给出了包含向列液晶内含物的不可压缩超弹性矩阵的连续统理论。用朗多-德-热纳理论描述了包体的弹性能，该弹性能是由导向场畸变引起的。该矩阵被描述为不可压缩的新胡克固体。通过各向异性表面张力描述了包体-基体界面的锚定效应。利用FEniCSx有限元程序对模型进行了数值实现。通过参数化研究，探讨了能源竞争对宏观和包涵响应的影响。与液体包裹体的情况类似，含有液晶包裹体的复合材料可以比基体更硬或更软，这取决于弹性毛细数的值。夹杂物的扭曲能和界面的锚固强度进一步影响软化或硬化效果。相反，施加的机械载荷可以重新定向定向器场。特别地，我们发现当包体的无因次体积很大时，应力诱导的取向是显著的，包括在张力下取向的对准和在压缩下取向的失向。提出的理论和新的物理见解可能对智能刺激响应材料的设计有用。Thin-Walled StructuresCoupling effects of loading state and loading rate on the nonlinear and failure behaviour of riveted joints: experiments and modelingTengfei REN, Cunxian WANG, Yongshuai WANG, Han Zhao, Tao SUOdoi:10.1016/j.tws.2025.113066加载状态和加载速率对铆接接头非线性和破坏行为的耦合影响：实验和模型Coupling effects of loading state and loading rate on the mechanical behaviour of a certain type of riveted joint are investigated experimentally and numerically. For the experiments, five types of riveted specimens including were designed to achieve various loading states. An advanced bi-directional electromagnetic split Hopkinson tensile bar system was utilized to achieve high loading rates. Subsequently, a micrographic analysis of the fractured rivets under different loading conditions was performed to understand the failure mechanism. The experimental results revealed a discernible influence of loading rate on the mechanical responses of the riveted joint, including yield force, ultimate force, energy absorption, and failure mechanism. Furthermore, it was observed that this loading rate effect exhibited a pronounced sensitivity to the loading state. Based on the physical deformation and failure mechanisms of the riveted joint, a novel simplified joint model incorporating the coupling effects of loading state and loading rate was developed. This model was further implemented into finite element program Abaqus/Explicit by adopting the user subroutine VUINTER. Through this approach, the mechanical responses of the riveted joints under different loading conditions were simulated using simplified numerical models. At last, a quantitative analysis was conducted by comparing the simulation results with experimental data. The analysis revealed a striking consistency between the simulated and experimental outcomes across various loading conditions, particularly in terms of the yield force, ultimate force and energy absorption. These findings indicate that the newly proposed joint model demonstrates excellent capability in characterizing the nonlinear and failure behaviour of the tested riveted joints over different loading states and a wide range of loading speeds. This work contributes to advancing the understanding of the complex mechanical behavior of riveted joints and provides a valuable tool for engineers to accurately predict and design the performance of riveted structures under various loading conditions.试验和数值研究了加载状态和加载速率对某型铆接接头力学性能的耦合效应。在试验中，设计了5种类型的铆接试件，以实现不同的加载状态。采用先进的双向电磁分离式霍普金森拉伸杆系统实现高加载率。随后，对不同加载条件下的断裂铆钉进行了微观分析，以了解其破坏机制。试验结果表明，加载速率对铆接接头的屈服力、极限力、能量吸收和破坏机制等力学响应有明显的影响。此外，还观察到这种加载速率效应对加载状态表现出明显的敏感性。基于铆接接头的物理变形和破坏机理，建立了考虑加载状态和加载速率耦合效应的新型铆接接头简化模型。该模型采用用户子程序VUINTER在有限元程序Abaqus/Explicit中进一步实现。通过该方法，采用简化的数值模型模拟了不同加载条件下铆接接头的力学响应。最后，将仿真结果与实验数据进行对比，进行定量分析。分析表明，在不同的加载条件下，模拟结果与实验结果之间具有惊人的一致性，特别是在屈服力、极限力和能量吸收方面。这些结果表明，新提出的铆接模型能够很好地表征铆接接头在不同加载状态和大加载速度范围内的非线性和破坏行为。这项工作有助于提高对铆接接头复杂力学行为的理解，并为工程师准确预测和设计铆接结构在各种载荷条件下的性能提供了有价值的工具。来源：复合材料力学仿真Composites FEM

【新文速递】2025年2月22日复合材料SCI期刊最新文章

Composite Structures

Composites Part A: Applied Science and Manufacturing

Composites Part B: Engineering

Composites Science and Technology

【新文速递】2025年2月11日固体力学SCI期刊最新文章