摘要
近年来考虑材料微结构不均匀性的晶粒几何模型和晶体塑性有限元方法备受关注。为了获得18CrNiMo7-6合金钢的本构参数,基于晶体塑性有限元方法对材料的晶体塑性参数进行了研究,采用晶体率相关硬化模型,基于多晶体有限元方法对晶体的塑性参数进行了敏感性分析,确定了参数变化的范围,并给出了一个代价函数,对有限元仿真结果进行处理,确定了一组最优的塑性参数组合。利用拉伸试验对计算结果进行了校准,结果表明模拟得到的应力-应变曲线和试验曲线吻合得较好,可为后续微结构引起的不均匀应力集中分析提供必要的材料参数,具有重要的实际意义。
Grain geometry models with inhomogeneity of microstructures and crystal plastic finite element methods(FEMs)have attracted more attention over recent years.To obtain constitutive parameters,anisotropy elastic and plastic constants of 18CrNiMo7-6 alloy steel were studied by using a crystal plastic FEM with software ABAQUS.Further,based on a polycrystalline FEM,sensitivity analysis of plastic parameters was carried out with a crystal ratio-dependent hardening model.In line with numerical calculations and tensile tests,a cost function was proposed and applied to determine a set of optimal plastic parameters.The results provided necessary material parameters for analysis of uneven stress concentration induced by microstructures.
作者
王刚
宋建
张建伟
王冰冰
WANG Gang;SONG Jian;ZHANG Jianwei;WANG Bingbing(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Province Engineering Laboratory for Anti-fatigue Manufacturing Technology,Zhengzhou University,Zhengzhou 450001,China;School of Mechanics and Engineering Science,Zhengzhou University,Zhengzhou 450001,China)
出处
《郑州大学学报（工学版）》
CAS
北大核心
2020年第2期38-43,共6页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(51801187)
国家自然科学基金联合基金重点项目(U1804254)
河南省高等学校重点科研项目资助计划(17A460026)。
