Fracture behavior of magnesium alloy MB2 under quasi-static and dynamic tension loading based on Johnson-Cook model

Jia Dong; Huang Xicheng; Hu Wenjun; Zhang Fangju

doi:10.11883/1001-1455(2017)06-1010-07

Volume 37 Issue 6

Sep. 2017

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Jia Dong, Huang Xicheng, Hu Wenjun, Zhang Fangju. Fracture behavior of magnesium alloy MB2 under quasi-static and dynamic tension loading based on Johnson-Cook model[J]. Explosion And Shock Waves, 2017, 37(6): 1010-1016. doi: 10.11883/1001-1455(2017)06-1010-07

Citation:

Jia Dong, Huang Xicheng, Hu Wenjun, Zhang Fangju. Fracture behavior of magnesium alloy MB2 under quasi-static and dynamic tension loading based on Johnson-Cook model[J]. Explosion And Shock Waves, 2017, 37(6): 1010-1016. doi: 10.11883/1001-1455(2017)06-1010-07

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Fracture behavior of magnesium alloy MB2 under quasi-static and dynamic tension loading based on Johnson-Cook model

doi: 10.11883/1001-1455(2017)06-1010-07

Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2016-04-12
Rev Recd Date: 2016-11-27
Publish Date: 2017-11-25

Abstract

Abstract

In the present study, we loaded smooth and notched cylindrical specimens of magnesium alloy MB2 under quasi-static and dynamic tension states using the material testing machine and split Hopkinson tension bar (SHTB), to characterize the alloy's tensile fracture behaviors under different stress states and strain rates. The constitution of the alloy for quasi-static and dynamic tension states was fitted and the modified fracture criterion based on the Johnson-Cook model was established and then used to simulate the fracture behavior of different tensile specimens. The microscopic damage mechanisms corresponding to the macroscopic fracture pattern was analyzed by SEM. The results show that with the increase of the stress triaxiality, the equivalent strain to fracture of the alloy increases at first and then decreases, and the fracture pattern changes from shear fracture to vertical tension fracture with micro damage mechanisms changing from the mixed failure to the dimple failure; with the increase of the strain rate, the equivalent strain to fracture decreases, and the fracture pattern remains the same. The Johnson-Cook constitution and the modified Johnson-Cook fracture criterion can be used to fit the experimental results under quasi-static and dynamic tension states and predict the cup-cone fracture characteristics of different specimens.
- fracture behavior,
- SHTB experiment,
- magnesium alloy MB2,
- stress triaxiality,
- strain rate

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References(19)

References

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