材料科学
镁合金
绝热剪切带
应变率
剪切带
变形(气象学)
复合材料
合金
压缩(物理)
本构方程
绝热过程
压力(语言学)
粘塑性
拉伤
剪应力
冶金
剪切(地质)
有限元法
结构工程
热力学
工程类
物理
哲学
内科学
医学
语言学
作者
F. Zhang,Z. Liu,Pingli Mao,F. Wang,Y. Liu
标识
DOI:10.1002/mawe.201800120
摘要
Abstract The dynamic compression behavior of AZ31B magnesium alloy with hat shaped specimen was investigated at high strain rate in this paper. Based on the Johnson‐cook constitutive model and fracture model, the interaction of temperature, stress and strain fields of AZ31B magnesium alloy with hat shaped specimen were numerically simulated by using ANSYS/LS‐DYNA software under different strain rates, which was validated by experiment. It is found that the plastic strain is highly concentrated on the corner of the hat shaped specimen, which leads to large localized deformation. The voids are nucleated and extended by compression stress. Work harden effect is caused by remained plastic strain, which is located around adiabatic shear band. The stress collapse is discovered in gauge section, which is also discovered in experiment. Thermal soften effect is suppressed with the strain rate increased.
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