【新文速递】2024年2月18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 2 篇，Thin-Walled Structures 4 篇

International Journal of Solids and Structures

Wet adhesion on rough surfaces: A JKR model with thermodynamic considerations

Yi Sun, Zongda Xie, Peiying He, Guozhuang Xu, Xiufeng Wang

doi:10.1016/j.ijsolstr.2024.112714

粗糙表面上的湿附着力：考虑热力学因素的 JKR 模型

Understanding wet adhesion is vital for advancing technologies such as underwater robotics, aquatic microsystems, and sweat-interfaced devices. It involves the formation of a liquid bridge with a meniscus between two solid surfaces. This phenomenon has a significant impact on surface adhesion, particularly in relation to roughness. Determining the profile of this liquid bridge is critical for accurately characterizing wet adhesion. In this paper, we propose a JKR mechanical model combined with a thermodynamic approach to investigate adhesive contact between a spherical indenter and an axisymmetric wavy surface in a wetting environment. The numerical solution for the pull-off force is obtained by considering parameters such as waviness, roughness, liquid volume, and liquid surface energy. Experimental validation is conducted to support the theoretical findings and provide insights into wet adhesion mechanisms on rough surfaces.

了解湿附着力对于水下机器人、水下微系统和汗液界面设备等技术的发展至关重要。它涉及在两个固体表面之间形成带有半月板的液桥。这种现象对表面附着力有重大影响，特别是与粗糙度有关。确定这种液桥的轮廓对于准确表征湿附着力至关重要。在本文中，我们提出了一种结合热力学方法的 JKR 机械模型，用于研究球形压头与轴对称波浪形表面在湿润环境中的粘附接触。通过考虑波浪度、粗糙度、液体体积和液体表面能等参数，得到了拉脱力的数值解。实验验证为理论结论提供了支持，并为粗糙表面的湿粘附机制提供了启示。

Mechanics of Materials

Notes on smooth and singular volumetric growth

Vladimir Goldshtein, Reuven Segev

doi:10.1016/j.mechmat.2024.104950

关于平稳和奇异体积增长的说明

The material structure of bodies undergoing growth is considered. In the geometric framework of a general differential manifold modeling the physical space and a fiber bundle modeling spacetime, body points may be defined for any extensive property for which a smooth flux field exists, even if the property is not conserved. Singular flux fields are considered using the notion of a de Rham current. Writing a generalized balance law using the boundary of the current corresponding to a singular flux field, surface growth is unified with volumetric growth.

研究考虑了正在生长的物体的物质结构。在模拟物理空间的一般微分流形和模拟时空的纤维束的几何框架中，可以为存在平滑通量场的任何广泛属性定义体点，即使该属性不守恒。奇异通量场是用德拉姆电流的概念来考虑的。利用奇异通量场对应的电流边界写出广义平衡定律，就可以将表面增长与体积增长统一起来。

International Journal of Plasticity

Gurson-Cohesive Modeling (GCM) for 3D Ductile Fracture Simulation

Jihyuk Park, Soondo Kweon, Kyoungsoo Park

doi:10.1016/j.ijplas.2024.103914

用于三维韧性断裂模拟的古尔松粘合剂模型 (GCM)

A Gurson-Cohesive Model (GCM) is proposed to investigate 3D ductile fracture accounting for the void growth, coalescence, and complete failure phenomena. The proposed model idealizes the ductile fracture process as continuum damage evolution, cohesive crack initiation, nonlinear softening along the crack surface, and complete failure. The Gurson model is employed to describe continuum damage with void growth, while the cohesive zone model is utilized to introduce discontinuous cracks and represent nonlinear softening behavior along the crack surfaces. The transition from the continuum damage to discontinuous crack is taken into account systematically using a porosity-based crack initiation criterion considering stress triaxiality. The computational results successfully reproduced the experimental results of fracture tests with 15-5 PH steel and structural carbon steel 20 within the unified modeling framework. Furthermore, strong and stable convergence of global and local responses (e.g., load-displacement curve, area reduction, crack tip location) are demonstrated under the mesh refinement without the aid of any ad hoc characteristic length scale parameter in the simulations.

本文提出了一种古尔松内聚模型（GCM），用于研究三维韧性断裂，其中考虑了空隙增长、凝聚和完全破坏现象。该模型将韧性断裂过程理想化为连续损伤演化、内聚裂纹起始、沿裂纹表面的非线性软化和完全破坏。采用 Gurson 模型来描述空隙增长的连续损伤，而采用内聚区模型来引入不连续裂纹并表示沿裂纹表面的非线性软化行为。考虑到应力的三轴性，使用基于孔隙率的裂纹起始准则系统地考虑了从连续损伤到非连续裂纹的过渡。在统一建模框架内，计算结果成功再现了 15-5 PH 钢和结构碳钢 20 的断裂试验结果。此外，在网格细化的情况下，全局和局部响应（如载荷-位移曲线、面积减小、裂纹尖端位置）的收敛性强且稳定，而不需要在模拟中使用任何特别的特征长度尺度参数。

A physics-based plasticity study of the mechanism of inhomogeneous strain evolution in dual phase 600 steel

Mohammad Hasan Joudivand Sarand, I. Burc Misirlioglu

doi:10.1016/j.ijplas.2024.103918

双相 600 钢中不均匀应变演变机制的物理塑性研究

In this study, we employ a physics-based crystal plasticity finite element method (CPFEM) approach to study the microstructural response of DP600 steel to various loading types. With the pursued approach, it is possible link microstructural changes in the dual phase (DP) steel to its macroscopic response in a convenient and efficient manner. Microstructural data were acquired first from experimental work via the electron backscattered diffraction (EBSD) method. DP crystallographic features were then fed to a numerical hybrid calculation subroutine combining a comprehensive physics-based crystal plasticity scheme for ferrite along with an isotropic plasticity scheme for martensite defined on a single-layer representative volume element (RVE). The developed single-layer 3D mode, while allowing for high computational efficiency, can capture the stress/strain distribution, revealing the microscopic features of the deformation process including the physical evolution of the dislocation density, retexturing, and morphology. The single-layer RVE physics-based method employed herein establishes the strong correlation between morphology, dislocation density and deformation response of the material under various loading types. Specifically, findings reveal that the tendency of the ferrite phase neighboring the martensite regions in the DP steel to retexture is much more profound than pure ferrite when subjected to the same loading conditions, pointing out to the steep strain gradients in the former component. Martensite phase facilitates considerable heterogeneity in the stress and strain distribution, increases the misorientation polarization as well as leading to local strain hardening in the neighboring ferrite volume that stem from profound increase in spatial dislocation density. Stress-strain curves under various loading schemes are simulated and discussed in the light of the experimental findings in literature, revealing the dependence of the microstructural evolution on the loading type.

在本研究中，我们采用基于物理学的晶体塑性有限元法（CPFEM）来研究 DP600 钢的微观结构对各种加载类型的响应。采用这种方法，可以方便有效地将双相钢（DP）的微观结构变化与其宏观响应联系起来。首先通过电子反向散射衍射（EBSD）方法从实验工作中获取微观结构数据。然后，将 DP 晶体特征输入数值混合计算子程序，该子程序结合了基于物理学的铁素体晶体塑性综合方案和定义在单层代表体积元素 (RVE) 上的马氏体各向同性塑性方案。所开发的单层三维模式在实现高计算效率的同时，还能捕捉应力/应变分布，揭示变形过程的微观特征，包括位错密度、重纹理和形态的物理演变。本文采用的基于物理的单层 RVE 方法确定了形态、位错密度和材料在不同加载类型下的变形响应之间的紧密相关性。具体地说，研究结果表明，在相同的加载条件下，DP 钢中邻近马氏体区域的铁素体相的再质化趋势比纯铁素体更明显，这表明前者存在陡峭的应变梯度。马氏体相促进了应力和应变分布的显著异质性，增加了错取向极化，并导致邻近铁素体体积的局部应变硬化，这源于空间位错密度的显著增加。根据文献中的实验结果，模拟并讨论了各种加载方案下的应力-应变曲线，揭示了微观结构演变对加载类型的依赖性。

Thin-Walled Structures

A bistable honeycomb mechanical metamaterial with transformable Poisson's ratio and tunable vibration isolation properties

Boya Xiao, Yu Liu, Wenshuai Xu, Rongyao Wei, Meng Chen, Heng Jiang

doi:10.1016/j.tws.2024.111718

具有可变泊松比和可调隔振特性的双稳态蜂窝机械超材料

With the increasing demand for vibration-isolation structures with tunable and multifunctional properties driven by the rapid development of complex engineering applications, metamaterials have emerged as promising candidates for this purpose owing to their extraordinary properties derived from their unique structural configurations. Owing to their unique deformation mechanisms, negative Poisson's ratio structures have been extensively studied in terms of vibration isolation and energy absorption; however, research on their performance tunability remains lacking. This paper describes a bistable honeycomb mechanical metamaterial (BHMM) consisting of cosine-shaped beams, which exhibits transformable Poisson's ratio and tunable vibration isolation properties. The proposed structure exhibited bistable properties, i.e., undergoing a configuration transition under external forces and retaining its existing configuration after the loading was removed. Furthermore, the two stable configurations exhibited distinctive elastic vibration characteristics, allowing the manipulation of elastic wave propagation on a subwavelength scale via local resonant mechanisms. Overall, this study presents a design methodology for multi-performance tunable metamaterials that satisfy the demands of the external environment. For example, the tunable vibration-isolation property of metamaterial makes it intriguing safety protection structures during crash events.

随着复杂工程应用的快速发展，对具有可调谐和多功能特性的隔振结构的需求与日俱增，超材料因其独特的结构配置而具有非凡的特性，已成为实现这一目的的有前途的候选材料。由于其独特的变形机制，负泊松比结构在隔振和能量吸收方面得到了广泛的研究；然而，有关其性能可调性的研究仍然缺乏。本文介绍了一种由余弦形梁组成的双稳态蜂窝机械超材料（BHMM），它具有可变泊松比和可调隔振特性。所提出的结构具有双稳态特性，即在外力作用下发生构型转换，并在卸载后保持现有构型。此外，这两种稳定构型还表现出独特的弹性振动特性，可通过局部共振机制在亚波长尺度上操纵弹性波的传播。总之，本研究提出了一种满足外部环境要求的多性能可调超材料的设计方法。例如，超材料的可调谐隔振特性使其在碰撞事件中成为耐人寻味的安全保护结构。

Numerical analysis and design methods of grout-filled GFRP tube repaired corroded CHS T-joints

Hongfei Chang, Xiaoyu Yan, Wenkang Zuo, Junwu Xia, Tao Yu

doi:10.1016/j.tws.2024.111719

灌浆填充 GFRP 管修复腐蚀 CHS T 型接头的数值分析和设计方法

This study explores the compressive behavior of Grout-Filled GFRP Tube (GFGT) repaired corroded circular hollow section (CHS) T-joints. Finite element models of GFGT repaired corroded joints were developed, validated, and utilized to examine the influence of the joint geometric, material, and chord end stress parameters on the compressive strength and repairing efficiency of the joints. The findings reveal that the ultimate strength of the GFGT repaired joint increases with a thicker GFRP tube, a lower repaired chord section hollow ratio, a higher grout strength, and a longer repaired range. By optimizing the repairing parameters of the grout-filled GFRP tube, the compressive strength of GFGT repaired corroded joints with 16% and 32% corrosion rates can be up to increase to 164% and 147% of the uncorroded counterparts, respectively. The chord end stress exerts a similar but weaker effect on the repaired joints than on the unrepaired joints. A series of suggestions were proposed for repairing joints with different corrosion degrees to achieve a 20% ultimate strength enhancement compared to uncorroded joints. The compressive strength degradation rate of corroded joints was accurately predicted by the design method in the CIDECT and prEN guidelines. The feasibility of the guideline formulae to evaluate the strength reduction rate caused by the chord end preload was verified. A design method to predict the compressive strength of GFGT repaired corroded joints was proposed.

本研究探讨了灌浆填充 GFRP 管 (GFGT) 修复腐蚀的圆形空心截面 (CHS) T 型接头的抗压行为。研究开发、验证并使用了 GFGT 修复腐蚀接头的有限元模型，以检验接头几何参数、材料参数和 弦端应力参数对接头抗压强度和修复效率的影响。研究结果表明，GFGT 修复接头的极限强度随 GFRP 管的厚度、较低的修复弦截面中空比、较高的灌浆强度和较长的修复范围而增加。通过优化灌浆填充 GFRP 管的修复参数，腐蚀率分别为 16% 和 32% 的 GFGT 修复腐蚀接头的抗压强度可分别提高到未腐蚀接头的 164% 和 147%。弦端应力对修复接头的影响与未修复接头类似，但较弱。为修复不同腐蚀程度的接头提出了一系列建议，使其极限强度比未腐蚀接头提高 20%。根据 CIDECT 和 prEN 指南中的设计方法，可以准确预测腐蚀接头的抗压强度降解率。验证了准则公式在评估弦端预载引起的强度降低率方面的可行性。提出了一种预测 GFGT 修复过的腐蚀接头抗压强度的设计方法。

Radial Force Analysis of Long Span Bridge with Trapezoidally Corrugated Steel Webs

Jilong Chai, Man Zhou, Yufeng Zhang

doi:10.1016/j.tws.2024.111720

采用梯形波纹钢腹板的大跨度桥梁的径向力分析

The study numerically and theoretically investigates the radial force effect of long span prestressed concrete (PC) box girders with trapezoidally corrugated steel webs (TCSWs). It reveals that under the influence of radial forces, the curved prestressing tendons in the bottom slab in long span box girder bridges with TCSWs exhibited higher levels of stress and deflection compared to conventional concrete box girder bridges due to the accordion effect of the TCSWs. Furthermore, this study simplifies the radial forces as concentrated forces of PC box girder with TCSWs. Based on this simplification, a formula is derived to accurately calculate the magnitude of these radial forces. Through parameter analysis of the power exponent in the equation defining the curve profile of the bottom slab, it was observed that lower power exponents result in more significant radial force effects. Finally, to eliminate the radial force effect, the study innovatively proposed an optimized structural scheme by adopting horizontal bottom slab at midspan and arranging horizontal diaphragms uniformly across the entire longitudinal span of the bridge. A contrastive study suggested that the horizontal arrangement of internal prestressing tendons in the bottom slab at midspan could effectively eliminate the negative impact of the radial force effects and greatly improve the overall bearing capacity of the box girders with TCSWs.

本研究从数值和理论上研究了带有梯形波纹钢腹板（TCSW）的大跨度预应力混凝土（PC）箱梁的径向力效应。研究发现，在径向力的影响下，由于梯形波纹钢腹板的手风琴效应，与传统混凝土箱梁桥相比，采用梯形波纹钢腹板的大跨度箱梁桥底板中的弧形预应力筋表现出更高的应力和挠度水平。此外，本研究还将径向力简化为带 TCSW 的 PC 箱梁的集中力。基于这一简化，得出了一个公式来精确计算这些径向力的大小。通过对定义底板曲线轮廓的公式中的功率指数进行参数分析，发现功率指数越小，径向力效应越明显。最后，为了消除径向力效应，研究创新性地提出了一种优化结构方案，即在中跨采用水平底板，并在桥梁的整个纵向跨度上均匀布置水平隔墙。对比研究表明，在中跨底板上水平布置内预应力筋可有效消除径向力效应的负面影响，大大提高采用 TCSW 的箱梁的整体承载能力。

Experimental and numerical investigations of a staged energy dissipation device

Weizhi Xu, Yijie Cai, Tianyang Zhang, Shuguang Wang, Dongsheng Du, Li Wan

doi:10.1016/j.tws.2024.111721

分阶段消能装置的实验和数值研究

Energy-dissipating devices (EDDs) are widely used in building structures to mitigate seismic disasters. This study designed a fully assembled friction-metal series damper which is one kind of the staged energy dissipation devices (SEDD). Quasi-static tests were conducted to examine the behaviour of the SEDDs. The influence of factors such as the configurations of the restrainers, pre-tightening force, and material of the metal strip module was investigated. The work behaviour of the SEDD consists of three stages: elastic, frictional energy dissipation, and metallic elastic–plastic energy dissipation stages. The experimental results verified the effectiveness of the predicted working mechanism and showed that the bearing capacity and energy dissipation of the SEDD increased with the configuration of the restrainers, pre-tightening force, and yield strength of the metal strip module. The experiment also showed that the rotation of the outer plates caused an unexpected force mode in the metal strip module. Subsequently, numerical models of the test specimens were built, and good agreement was observed between the numerical simulations and test results for the hysteresis performance, loading capacity, and stress distribution. To further improve the mechanical properties of the SEDD, an optimised model was established and studied. The SEDDs with optimised strip shapes and constraint conditions of the outer plate exhibited better mechanical performance, and their load capacities increased by 11% and 41%, respectively.

消能装置（EDD）被广泛应用于建筑结构中，以减轻地震灾害。本研究设计了一种全装配式摩擦金属串联阻尼器，它是分阶段消能装置（SEDD）的一种。研究人员进行了准静态试验，以检验 SEDD 的性能。研究了限制器的配置、预紧力和金属带模块材料等因素的影响。SEDD 的工作行为包括三个阶段：弹性阶段、摩擦消能阶段和金属弹塑性消能阶段。实验结果验证了预测工作机制的有效性，并表明 SEDD 的承载能力和耗能随约束装置的配置、预紧力和金属带模块的屈服强度而增加。实验还表明，外板的旋转会导致金属带模块出现意外的受力模式。随后，建立了试样的数值模型，并观察到数值模拟和试验结果在滞后性能、承载能力和应力分布方面具有良好的一致性。为了进一步提高 SEDD 的机械性能，我们建立并研究了一个优化模型。优化了条带形状和外板约束条件的 SEDD 具有更好的机械性能，其承载能力分别提高了 11% 和 41%。