材料科学
应变率
断裂(地质)
本构方程
流动应力
复合材料
扫描电子显微镜
钛合金
极限抗拉强度
分离式霍普金森压力棒
可塑性
拉伸试验
合金
压力(语言学)
粘塑性
张力(地质)
冶金
有限元法
结构工程
哲学
工程类
语言学
作者
Ravindranadh Bobbili,V. Madhu
标识
DOI:10.1016/j.jallcom.2016.05.155
摘要
To understand the flow and fracture behavior of near-α titanium alloy, the influence of stress triaxiality and strain rate on the failure behavior of this alloy was considered. The combined effect of strain rate, temperature and stress triaxiality on the behavior was studied by testing both smooth and notched specimens. Johnson-Cook (J-C) constitutive and fracture models were established based on high strain rate tensile data obtained from Split hopkinson tension bar (SHTB) and quasi-static tests. The Johnson Cook constitutive and fracture models have been calibrated. A modified Johnson–Cook model was established and proved to have high accuracy. The calibrated model has been validated by simulating the tension tests at various triaxialities using ANSYS autodyn software. Finite element simulations were used to predict the effective plastic strain versus triaxiality history within the deforming specimens. The fracture surfaces of specimens tested under various strain rates and temperatures were studied under scanning electron microscopy (SEM).
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