Higher-order boundary conditions for passivation mediated by plastic strain gradients

IF 3.8 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures Pub Date : 2025-07-16 DOI:10.1016/j.ijsolstr.2025.113574

Chaoxiang Ma , Yuyang Xie , Dabiao Liu

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引用次数: 0

Abstract

The theory of higher-order strain gradient plasticity is applied to investigate passivation effects, due to its superior capability in handling boundary conditions. In this study, a higher-order boundary condition accounting for the plastic strain gradient at the boundary layer is implemented based on the Fleck-Hutchinson-Willis theory. The role of the higher-order boundary condition is investigated under three non-proportional loading conditions: stretch-passivation, bending-passivation, and torsion-passivation. The higher-order boundary condition significantly reduces the strain hardening rate during plastic flow, in contrast to the conventional boundary condition where dislocations are fully blocked. The plastic strain gradient at the boundary layer controls the yield strength of the microscale metallic materials. The theoretical predictions align with the experimental results. This study provides valuable insight into the underlying mechanisms governing passivation effects in microscale metallic materials.

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塑性应变梯度介导钝化的高阶边界条件

由于高阶应变梯度塑性理论具有处理边界条件的优越能力，因此可以应用于钝化效应的研究。在本研究中，基于Fleck-Hutchinson-Willis理论实现了考虑边界层塑性应变梯度的高阶边界条件。研究了高阶边界条件在拉伸钝化、弯曲钝化和扭转钝化三种非比例加载条件下的作用。与位错被完全阻断的常规边界条件相比，高阶边界条件显著降低了塑性流动过程中的应变硬化率。边界层处的塑性应变梯度控制着微尺度金属材料的屈服强度。理论预测与实验结果一致。这项研究为微观金属材料钝化效应的潜在机制提供了有价值的见解。

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来源期刊

International Journal of Solids and Structures 物理-力学

CiteScore

6.70

自引率

8.30%

发文量

405

审稿时长

70 days

期刊介绍： The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.