Dynamic response of hollow hemispherical shell of titanium alloy after thermal oxidation

doi:10.3969/j.issn.1000-1565.2020.01.001

Abstract

Abstract: The finite element program is used to simulate the bullet impact of TC4(Ti-6Al-4V)hot titanium oxide alloy inner hollow hemisphere shell. Based on quasi-static compression test and dynamic Hopkinson pressure bar test data, the effect of diameter-thickness ratio, impact velocity and strain rate on TC4 is studied. The contact force peak and the vertex displacement of the inner hollow hemisphere shell of TC4 hot titanium oxide alloy under different working conditions were obtained. The material model of the TC4 hot titanium oxide alloy is described by the Johnson-Cook constitutive relationship considering the strain rate effect and the temperature effect, where in the test data is measured by Hopkinson pressure bar technology. The results show that the contact force peak and the vertex displacement are inversely proportional to the diameter-thickness ratio; the contact force peak and the vertex displacement are both proportional to the impact velocity; the strain rate effect enhances the impact resistance and the resistance of deformation of the TC4 hot titanium oxide alloy inner hollow hemisphere shell.

Key words: TC4 hot titanium oxide alloy, Johnson-Cook equation, peak contact force, dynamic response, strain rate effect

CLC Number:

O347.3

NIU Xiaoyan, GENG Xuchen, CHEN Cong, SHEN Linlin, ZHANG Zhanbiao. Dynamic response of hollow hemispherical shell of titanium alloy after thermal oxidation[J]. Journal of Hebei University (Natural Science Edition), 2020, 40(1): 1-6.

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