上海大学学报(自然科学版) ›› 2021, Vol. 27 ›› Issue (3): 583-593.doi: 10.12066/j.issn.1007-2861.2159

• 研究论文 • 上一篇    下一篇

晶体塑性有限元分析开孔对多晶板材力学性能的影响

胡晓郁1, 都亚鹏1, 楚海建1,2()   

  1. 1.上海大学 上海市应用数学和力学研究所, 上海 200072
    2.上海大学 理学院, 上海 200444
  • 收稿日期:2019-05-08 出版日期:2021-06-30 发布日期:2021-06-27
  • 通讯作者: 楚海建 E-mail:hjchu@shu.edu.cn
  • 作者简介:楚海建(1972—), 男, 教授, 博士生导师, 博士, 研究方向为晶体塑性力学. E-mail: hjchu@shu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(11872237);上海市自然科学基金资助项目(18ZR1414600)

Effect of hole opening on mechanical properties of polycrystalline plate based on crystal plastic finite element

HU Xiaoyu1, DU Yapeng1, CHU Haijian1,2()   

  1. 1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China
    2. College of Sciences, Shanghai University, Shanghai 200444, China
  • Received:2019-05-08 Online:2021-06-30 Published:2021-06-27
  • Contact: CHU Haijian E-mail:hjchu@shu.edu.cn

摘要:

基于 ABAQUS 子程序 VUMAT 二次开发平台, 将位错和孪晶的演化过程引入晶体塑性有限元方法(crystal plastic finite element method, CPFEM)中, 实现了多晶塑性材料力学行为的有限元模拟, 并通过试验和模拟结果的对比, 验证了所提出方法和二次开发程序的有效性. 应用含孪晶效应的晶体塑性有限元方法 模拟分析了孔洞对于板材开孔问题的影响, 结果表明: ① 当孔径小于板宽一半时, 强度损失采用线性近似估算值是偏于安全的, 而超过板宽一半时, 不宜采用线性估算值; ② 当孔距较小时, 孔径排布方式对开孔板材的韧性以及极限承载力有重要影响, 排布方式可分弱影响区、强影响区和过渡区 3 种模式. 对于承受单向拉伸荷载的板材, 开孔时应选择沿轴线排布的方式.

关键词: 晶体塑性有限元方法, 多孔板材, 位错演化, 孪晶机制

Abstract:

Based on the secondary development platform of ABAQUS subroutine VUMAT, the dislocation evolution and twinning mechanism have been incorporated into the crystal plastic finite element method (CPFEM), which is used to investigate the mechanical behavior of polycrystalline plastic materials. The validity of the secondary development program is verified by comparing the experimental and simulation results. The CPFEM with its twinning effect simulates and analyzes the effect of holes on the mechanical properties of the plate. Furthermore, linear approximation can be used safely when the aperture is less than half of the plate width; however, it is not suitable for larger apertures. When the spacing between two hole openings is small, their positional arrangement has a significant impact on the toughness and ultimate stress of the plate; this impact can be divided into three modes: weak influence zone, strong influence zone, and transition zone. For the plate with double holes subjected to a tensile load, an arrangement along the axis is the most optimum.

Key words: crystal plastic finite element method, porous plate, dislocation evolution, twinning mechanism

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