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为深入研究钨合金杆式弹穿甲侵彻过程中的变形、失效模式,利用扫描电镜和有限元数值模拟,观测、分析钨合金残余弹芯头部剖面显微组织的变形演化。结果表明:穿甲侵彻过程中,钨合金弹芯头部发生剧烈的塑性变形而呈“蘑菇头”形状,钨晶粒被严重压扁,表出现良好的动态塑性。弹芯“蘑菇头”前端垂直侵彻方向1mm处产生绝热剪切带,剪切带内W颗粒和W-W界面上均有微裂纹产生,并表现出溶化现象。数值模拟表明,钨合金在侵彻过程中“蘑菇头”不断形成和脱落,弹芯因此发生销蚀而逐渐变短。弹芯“蘑菇头”处材料剧烈变形如同塑性流动,变形局部化主要出现在“蘑菇头”两侧边缘或前端垂直于侵彻方向处。
In order to further study the deformation and failure mode during penetration of tungsten alloy rod projectile, the deformation evolution of the microstructure in the head of tungsten alloy residual projectile core was observed and analyzed by scanning electron microscope and finite element numerical simulation. The results show that during the piercing process, the head of the tungsten alloy ball shows a violent plastic deformation with “mushroom head” shape. The tungsten grains are severely crushed and the table shows good dynamic plasticity. The adventitious shear band was formed at 1mm perpendicular to the penetration direction of the core of the “mushroom head”, the W particles in the shear band and the microcracks on the W-W interface were generated, and the melting phenomenon was observed. The numerical simulation shows that the “mushroom head” continues to form and fall off during the penetration process of the tungsten alloy, and therefore the pin core gradually erodes and becomes shorter. Cataplasm core “mushroom head ” Department of material deformation as plastic flow, deformation localized mainly in the “mushroom head ” edge or front edge perpendicular to the direction of penetration.