Numerical simulation on local orientation deviation evolution of polycrystalline pure copper under monotonic and cyclic load
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 ori-entation 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 disadvan-tages 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 re-gions 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 spec-trum of KAM is sensitive to load and has a higher correlation coefficient,which can better characterize deformation damage.
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