单调与循环载荷下多晶纯铜局部取向差演化数值模拟  

Numerical simulation on local orientation deviation evolution of polycrystalline pure copper under monotonic and cyclic load

作　　者：郑战光[1] 郭顺 孙腾 谢昌吉 黄增 ZHENG Zhan-guang;GUO Shun;SUN Teng;XIE Chang-ji;HUANG Zeng(School of Mechanical Engineering,Guangxi University,Nanning 530004,China;College of Mechanical Engineering&Ocean Engineering,Beibu Gulf University,Qinzhou 535011,China;School of Mechanical Engineering,Guangxi Technological College of Machinery and Electricit,Nanning 530007,China)

机构地区：[1]广西大学机械工程学院,广西南宁530004 [2]北部湾大学机械与船舶海洋工程学院,广西钦州535011 [3]广西机电职业技术学院机械工程学院,广西南宁530007

出　　处：《塑性工程学报》2024年第5期146-154,共9页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52265018,51675110);广西自然科学基金资助项目(2021GXNSFAA220119)。

摘　　要：为了揭示不同载荷下局部取向差的演化规律及其与变形损伤的关系,选取多晶纯铜为研究对象,基于DAMASK晶体塑性有限元的开源软件及Python脚本代码编写软件,研究了多晶纯铜在单调拉伸与循环载荷下的晶粒内取向差(KAM)、晶粒参考取向偏差(GROD)与等效塑性应变的演化规律,并采用取向差频率分布与相关系数评估了KAM与GROD表征变形损伤的优劣。结果表明:单调拉伸与循环载荷下KAM、GROD与等效塑性应变峰值区域分布一致,高取向差和高塑性区域首先出现在晶界或者三叉晶界附近,且取向差与宏观等效塑性应变呈线性正相关。单调拉伸和循环加载下GROD的频谱相似,而KAM的频谱对载荷敏感且相关系数更高,能更好地表征变形损伤。To reveal the evolution laws of local orientation deviation and the relationship between them and the deformation damage under different loads,polycrystalline pure copper was selected as the research object,and based on DAMASK crystal plastic finite element open source software and Python script code writing software,the evolution laws of kernel averaged misorientation(KAM),grain reference orientation deviation(GROD)and equivalent plastic strain of polycrystalline pure copper under monotonic tension and cyclic loads were studied.And the orientation deviation frequency distribution and correlation coefficient were used to evaluate the advantages and disadvantages of KAM and GROD in characterizing deformation damage.The results show that the distribution of KAM,GROD and equivalent plastic strain peak value regions under monotonic tension and cyclic loads is consistent.High orientation difference and high plasticity regions first appear near grain boundaries or trigeminal grain boundaries,and the orientation difference is linearly positively correlated with macroscopic equivalent plastic strain.The spectrums of GROD under both monotonic tension and cyclic loads are similar,while the spectrum of KAM is sensitive to load and has a higher correlation coefficient,which can better characterize deformation damage.

关 键 词：晶体塑性 DAMASK 等效应变 晶粒内取向差 晶粒参考取向偏差 

分 类 号：TH114[机械工程—机械设计及理论]