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The modified temperature term on Johnson-Cook constitutive model of AZ31 magnesium alloy with {0002} texture

查看全文 作　　者：Feng [1,2]Zhang;Zheng [1]Liu;Yue [1]Wang;Pingli [1]Mao;Xinwen [3]Kuang;Zhenglai [3]Zhang;Yingdong [4]Ju;Xiaozhong [4]Xu 高影响力作者 机构地区：[1]School of Material Science and Engineering,Shenyang University of Technology,Shenyang 110870,People’s Republic of China;[2]Shenyang Agriculture University,Shenyang 110866,People’s Republic of China;[3]Zhejiang huashuo Technology co.LTD.,Ningbo 315000,People’s Republic of China;[4]Ningbo Haizhi Material Industry Innovation Research Institute,Ningbo 315000,People’s Republic of China高影响力机构 出　　处：《Journal of Magnesium and Alloys》索引2020年第8卷第1期,共12页高影响力期刊 基　　金：This work was supported by Surface of the State Natural Science Fund Projects(No.51571145);City of Ningbo“science and technology innovation 2025”major special project(new energy vehicle lightweight magnesium alloy material precision forming technology). 摘　　要：The dynamic compression experiments with Split-Hopkinson Pressure Bar(SHPB)were performed on AZ31 magnesium alloy rolled sheet specimens in the normal direction(AZ31-ND)with{0002}texture at the temperature of 293-523 K and the strain rate of 0.001-2200 s^−1.The temperature term in Johnson-Cook(JC)constitutive model had been reasonably modified.This advantage made constitutive model promising for decribing the dynamic deformation behavior of AZ31-ND with{0002}texture more accurately.The obtained true stress-true plastic strain curves agreed well with the measured results in a wide range of strain rates and temperatures.The thermal softeninging,strain and strain rate hardening effect on the AZ31-ND with{0002}texture were discussed.The adiabatic shear band(ASB)of AZ31-ND with{0002}texture hat shaped specimen was successfully predicted by combining modified JC constitutive model and numerical simulation,which was also validated by Electron Back-Scattered Diffraction(EBSD)map under the same boundary condition. 关 键 词：Modified Johnson Cook constitutive model AZ31-ND with{0002}texture Dynamic compression Numerical simulation Adiabatic shear band
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