【摘要】 为了探讨铝飞片撞击陶瓷材料时的层裂现象,采用改进SPH方法模拟应力波在陶瓷材料中的传播。结果表明,当离散粒子分布不均匀时,数值模拟计算的自由面速度时程曲线与实测曲线吻合良好。对比CSPM方法,改进SPH方法的精度更高。提出适用于数值模拟的陶瓷材料损伤演化方程,对脉冲载荷下陶瓷/钢层合板层裂的破坏过程进行数值模拟,结果表明,由于陶瓷的波阻抗高于钢的,且抗压强度远高于抗拉强度,因此拉应力引起的层裂破坏是主要的。即使在材料内部传播的只是弹性压缩波,当弹性波到达材料界面时,由界面反射引起的卸载波也能导致陶瓷发生层裂破坏。更多还原

【Abstract】 To explore the spallation in ceramic impacted by an aluminum flyer,the modified SPH method was used to simulate the stress wave propagation in ceramic.The results show that the simulated free-surface velocity histories are in agreement with the experimental ones when the discrete particles are distributed non-uniformly.The precision of the results by the modified SPH method is higher than that by CSPM.And a damage evolution equation for ceramic was proposed to numerically simulate the spallation process of laminated ceramic-steel armor plates under pulse loading.The results display that the wave impedance in ceramic is much higher than that in steel and the spallation induced by tension stress is primary.Even though an elastic compression wave propagates in ceramic,the unloading wave reflected by the ceramic-steel interface can also lead to ceramic spallation.更多还原