Dynamic shear behavior and failure mechanism of Ti-6Al-4V at high strain rates

ZHANG Weiqi; XU Zejian; SUN Zhongyue; TONG Yi; HUANG Fenglei

doi:10.11883/bzycj-2017-0107

Volume 38 Issue 5

Jul. 2018

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Article Navigation > Explosion And Shock Waves > 2018 > 38(5): 1137-1144

ZHANG Weiqi, XU Zejian, SUN Zhongyue, TONG Yi, HUANG Fenglei. Dynamic shear behavior and failure mechanism of Ti-6Al-4V at high strain rates[J]. Explosion And Shock Waves, 2018, 38(5): 1137-1144. doi: 10.11883/bzycj-2017-0107

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ZHANG Weiqi, XU Zejian, SUN Zhongyue, TONG Yi, HUANG Fenglei. Dynamic shear behavior and failure mechanism of Ti-6Al-4V at high strain rates[J]. Explosion And Shock Waves, 2018, 38(5): 1137-1144. doi: 10.11883/bzycj-2017-0107

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Dynamic shear behavior and failure mechanism of Ti-6Al-4V at high strain rates

doi: 10.11883/bzycj-2017-0107

State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Received Date: 2017-04-01
Rev Recd Date: 2017-09-11
Publish Date: 2018-09-25

Abstract

Abstract

Dynamic shear properties and failure mechanism of Ti-6Al-4V were studied at strain rates in excess of 10⁴ s^-1, with a new loading method based on the split Hopkinson pressure bar (SHPB) technique. The shear stress-shear strain curves and failure parameters of Ti-6Al-4V were acquired in a wide range of high shear strain rates. It is found that the flow stress of the material shows an obvious strain rate hardening effect. With the increase of strain rates, the failure stress of the material increases gradually, while the failure strain decreases. The loading process was modeled by ABAQUS/Explicit software. The results show that the shear zone material is substantially in the state of plane shear. The tested stress-strain curves have good agreement with the simulated results. The fracture surface examination shows that with the increase of strain rate, the failure of Ti-6Al-4V is closely related to the different behaviors of dimples, and it indicates an evolution process from dimples and tensile dimples to steps and river patterns. The fracture analyses show that the failure mode of the material is mainly ductile fracture.
- dynamic shear,
- double shear specimen,
- high strain rate,
- micro-mechanism

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References(23)

References

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