Research on damage failure of TA18 titanium alloy based on stress triaxiality

Zhang Tianwen; Wang Ying; Li Wei; Jiang Jian; Peng Li; Yu Hui

doi:10.7513/j.issn.1004-7638.2021.06.030

Volume 42 Issue 6

Dec. 2021

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Zhang Tianwen, Wang Ying, Li Wei, Jiang Jian, Peng Li, Yu Hui. Research on damage failure of TA18 titanium alloy based on stress triaxiality[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(6): 206-212. doi: 10.7513/j.issn.1004-7638.2021.06.030

Citation:

Zhang Tianwen, Wang Ying, Li Wei, Jiang Jian, Peng Li, Yu Hui. Research on damage failure of TA18 titanium alloy based on stress triaxiality[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(6): 206-212. doi: 10.7513/j.issn.1004-7638.2021.06.030

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Research on damage failure of TA18 titanium alloy based on stress triaxiality

doi: 10.7513/j.issn.1004-7638.2021.06.030

Zhang Tianwen¹,
Wang Ying^{2, 3},
Li Wei¹,
Jiang Jian^{2, 3},
Peng Li^{2, 3},
Yu Hui^1
,

1.
School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China
2.
Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China
3.
Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd., Chengdu 610300, Sichuan, China

Received Date: 2021-11-09
Accepted Date: 2021-11-19
Publish Date: 2021-12-31

Abstract

Abstract

Tensile specimens made of TA18 titanium alloy with different notch sizes were designed to carry out tensile tests under different stress states at room temperature, and fracture morphology observation had been done. The ductile fracture characteristics of TA18 titanium alloy were studied through the combination of experiment and numerical calculation. The influence law of stress state on microscopic fracture mechanism had been analyzed. The Bridgman forward calculation method was used to correct the stress data after necking instability. The Johnson-Cook (JC) constitutive model of TA18 titanium alloy was established, and the average stress triaxiality and fracture strain of the tensile specimen were calculated and determined by the regression method. The damage failure model of TA18 titanium alloy is presented. The results show that the fracture strain of TA18 titanium alloy under different stress states is different. The fracture strain decreases with the increase of stress triaxiality, and the fracture dimple size is positively correlated with the stress triaxiality. The established damage failure model can explain the fracture characteristics of the material.
- TA18 titanium alloy,
- ductile fracture,
- stress triaxiality,
- damage failure,
- numerical simulation

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References(17)

References

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