钨合金杆式弹穿甲侵彻开坑阶段绝热剪切失效的数值模拟

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (18) : 111-116.

论文

王猛杨明川罗荣梅唐恩凌

作者信息 +

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

Wang Meng, Yang Mingchuan, Luo Rongmei, Tang Enling

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文章历史 +

摘要

为深入研究钨合金杆式弹芯在穿甲侵彻过程中的失效机制，利用LS-DYNA3D动力学软件对侵彻开坑阶段的塑性变形演化和绝热剪切失效进行数值模拟。侵彻开坑阶段，弹芯头部首先形成蘑菇头，随后在蘑菇头后端帽檐处和最前端鼻尖处分别形成绝热剪切失效。得到剪切带内的等效塑性应变、应力状态和温度变化等特征参量，并分析了剪切失效对弹芯侵彻性能的影响。侵彻开坑阶段虽然时间很短，弹芯的受力状态变化较快，蘑菇头最前端的绝热剪切失效可能造成弹芯侵彻的瞬间停滞而对侵彻性能起消极作用。

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.

导出引用

王猛杨明川罗荣梅唐恩凌 . 钨合金杆式弹穿甲侵彻开坑阶段绝热剪切失效的数值模拟[J]. 振动与冲击, 2016, 35(18): 111-116

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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