【摘要】 高速撞击条件下,弹、靶材料的变形失效机制是穿甲侵彻机理研究的重要内容,利用ANSYS/LS-DYNA动力学程序对钨合金杆式弹侵彻45#钢板进行数值模拟。结果表明,撞击瞬间,强压缩冲击波沿弹芯和靶板的撞击接触面分别向弹芯和靶板内部传递,波后的等效应力超过材料的强度极限,因而发生剧烈塑性变形甚至破碎。侵彻过程中,钨合金弹芯前端3mm～4mm处热软化效应显著,应力强度发生塌陷,导致塑性变形流动而形成"蘑菇头"。45#钢的破坏方式主要是延性扩孔,对应弹、靶材料的塑性变形较均匀,整个侵彻不发生绝热剪切局部化行为。更多还原

【Abstract】 The deformation and fracture behaviour of projectile penetrating into target act the major role in armour-piercing mechanism.ANSYS/LS-DYNA explicit dynamic program was employed to simulate the interaction of long-rod penetrator of tungsten alloy impacting at 45# steel target.It shows that two compressive shock waves are induced and transmit along opposite directions from the contact interface.The value of equivalent stress increased rapidly over the stress limit causes severe plastic deformation even fracture at the contact interface.For thermal softening resulted from such severe plastic deformation,plastic flow is induced and finally "mushroom head" is formed at the region 3mm~4mm in front of the head of the tungsten alloy penetrator.For the 45# steel,the form of perforating fracture is mainly ductile hole expanding,the plastic deformation is more uniform and no adiabatic shear localization occurs during penetration.更多还原