改进SPH方法在陶瓷材料层裂数值模拟中的应用  

Application of modified SPH method to numerical simulation of ceramic spallation

作　　者：章杰[1] 苏少卿[1,2] 郑宇[1,3] 王肖钧[1] 

机构地区：[1]中国科学技术大学近代力学系,安徽合肥230027 [2]安徽建筑工业学院土木工程学院,安徽合肥230022 [3]南京理工大学智能弹药技术重点实验室,江苏南京210094

出　　处：《爆炸与冲击》2013年第4期401-407,共7页Explosion and Shock Waves

基　　金：国家自然科学基金项目(11102205);中国博士后科学基金项目(20100480686)~~

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。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 simu- lated free-surface velocity histories are in agreement with the experimental ones when the discrete par- ticles are distributed non-uniformly. The precision of the results by the modified SPH method is high- er than that by CSPM..And a damage evolution equation for ceramic was proposed to numerically sim- ulate 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 un- loading wave reflected by the ceramic-steel interface can also lead to ceramic spallation.

关 键 词：固体力学 侵彻层裂 改进SPH方法 损伤演化 陶瓷 

分 类 号：O347.4[理学—固体力学]