材料科学
应变率
断裂(地质)
流动应力
微尺度化学
压力(语言学)
变形(气象学)
拉伤
断口学
复合材料
合金
有限元法
机械
冶金
结构工程
数学
物理
医学
语言学
哲学
数学教育
内科学
工程类
作者
Yue Xiao,Qi Tang,Yumei Hu,Jian Peng,Wei Luo
标识
DOI:10.1016/j.msea.2018.03.050
摘要
This paper presents an on-going study of light-weight alloy ZK60 magnesium. The uniaxial tensile tests were carried out with strain rate range of (0.0001–1000)/s−1 and with different stress states. Elemental data was identified through an iteration process using finite element analysis. The modified Johnson-Cook (J-C) model was calibrated to describe the flow stress as a function of strain and strain rate. The modified Mohr-Coulomb (M-C) model, considering the effects of strain, stress state and strain rate, was proposed with satisfactorily determined parameters. Compared by the original J-C fracture model, the modified M-C fracture model tracks the fracture behavior more accurately. To complement the macroscale fracture information, fractography reveals the fracture and deformation mechanism in microscale. The agreements between the simulations and tests further confirmed that the modified J-C material model and the modified M-C material model can give a precise estimate of the mechanical and fractural behavior of the ZK60 alloy.
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