Analysis on Sheet Cyclic Plastic Deformation Using Mixed Hardening Model
Treating the cyclic deformation problem of sheet flowing through drawbead as the object of the research,using HILL anisotropy yield criterion and mixed hardening model,the cyclic plastic deformation mechanism of sheet was studied,the deformation characteristics of sheet subjected to cyclic loads were revealed,and the influence of Bauschinger effect on stress-strain circulating relationship and the influence of bending neutral layer migration on the stress of sheet`s intermediate integral point were analyzed as well.The effectiveness of the model was verified by experiments.The results of analysis were showed that the stress values influenced by Bauschinger effect were different at the yield point of reverse loading and the point of unloading during the cyclic deformation.The stress rate at the yield point of reverse loading and the point of unloading in different loading branches was also different.The stress-strain circulating relationship in different loading branches can be approximately treated as bilinear.The tangent modulus of each loading branch showed a significant downward trend as the times of the reverse loading increased.The tangent modulus calculated by the mixed hardening model after the second loading branch reduced to less than 21% of the first loading tangent modulus.Effected by the neutral layer migration,the stress-strain curve of integral point of sheet`s intermediate layer showed alternating transition phenomenon of the tensile stress and compressive stress.
Anisotropy Mixed Hardening Model Cyclic Load Bauschinger Effect Drawbead
LI Qun JIN Miao ZHU Yuxin
Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University),Ministry of Department of Computer and Information Engineering,Yanshan University,Qinhuangdao,Hebei,066004,China
国际会议
沈阳
英文
982-987
2013-07-06（万方平台首次上网日期，不代表论文的发表时间）