Numerical simulation of the adiabatic shear failure at cratering stage for tungsten alloy long rod piercing into armor

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (18) : 111-116.

Wang Meng, Yang Mingchuan, Luo Rongmei, Tang Enling

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Abstract

The purpose is to further investigate failure mechanism of tungsten alloy long rod penetrator piercing into armor target. LS-DYNA3D dynamic code is employed to simulate large plastic deformation evolution and adiabatic shear failure at penetration cratering stage. Large mushroom-head is first formed of tungsten alloy penetrator during cratering stage and then adiabatic shear failure followed due to plastic shear instability. The adiabatic shear bands are distributed mainly at the back of mushroom-head edge and the front of mushroom-head nose respectively. The mechanical condition which results in the distribution of adiabatic shear failure is also discussed. Based on the simulation, it can be proposed that the adiabatic shear failure distributing at the front of the mushroom-head may lead to short stagnating penetration, which is negative to the penetration performance.

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Penetration / Tungsten alloy long-rod / Mushroom-head / Adiabatic shear failure / Numerical simulation

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Wang Meng, Yang Mingchuan, Luo Rongmei, Tang Enling . Numerical simulation of the adiabatic shear failure at cratering stage for tungsten alloy long rod piercing into armor[J]. Journal of Vibration and Shock, 2016, 35(18): 111-116

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