材料科学
单轴张力
应变率
复合材料
硬化(计算)
流动应力
应变硬化指数
有限元法
本构方程
压缩(物理)
剪切(地质)
压力(语言学)
剪应力
可塑性
张力(地质)
加工硬化
结构工程
极限抗拉强度
微观结构
哲学
工程类
图层(电子)
语言学
作者
Hao Hu,Zhijia Xu,Dou Wang,Fenglei Huang
标识
DOI:10.1016/j.ijimpeng.2020.103689
摘要
Uniaxial compression, uniaxial tension, and new double shear experimental methods are used to study the effect of stress state on the mechanical behaviors of Ti-6Al-4V over a wide range of strain rates (0.001-6500s−1). The experimental results show that strain rate and stress state both have strong influences on the plastic flow and failure properties of the material. With an increasing strain rate, the work-hardening rate increases under uniaxial compression loading, but decreases under uniaxial tension and shear. Moreover, with the increase of strain rates, the initial failure strain increases under uniaxial tension, but decreases under the uniaxial compression conditions. Based on the experimental results, the Johnson-Cook (JC) hardening laws are used in finite element analysis (FEA) to simulate the mechanical responses of the material. It shows that the simulated results and the experimental data are in good agreement. The results indicate that the effects of strain rate and stress state should be considered in the constitutive model. Fractographic examinations are also conducted under different loading conditions. The failure processes of the material are controlled by different micro-mechanisms.
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