摘要
利用现有文献数据以及实验与数值模拟结合的方法得到了Al2O3陶瓷的Johnson-HolmquistⅡ(JH2)本构模型参数,并且基于这种含损伤的动态本构模型,采用LS-DYNA显式有限元软件对Al2O3陶瓷在低速撞击下的破碎过程进行了数值模拟,再现了试件的损伤演化与动态破碎过程。结果表明,Al2O3陶瓷在冲击载荷作用下,主要呈轴向劈裂状破坏;随着输入压缩波加载时间的减小,试件的破碎程度加剧;利用JH-2模型对Al2O3陶瓷在SHPB实验中的动态损伤演化过程的模拟结果与实验回收试件的破碎模式基本一致,从而验证了JH-2模型在模拟低速撞击下陶瓷动态破碎过程的有效性和可行性。
Parameters of the Johnson-Holmquist constitutive model（JH-2） were determined for Al2O3 ceramic from the existing literature data by using a combination method of experimental and numerical techniques.Based on this JH-2 model containing damage,an explicit finite element analysis code LSDYNA was applied to simulate the damage mechanism and fragmentation process of the Al2O3 ceramic subjected to low-velocity impact in a SHPB system.The results of this work may be summarized as follows：Under dynamic compression,Al2O3 ceramic mainly takes on axial split damage;The shorter the loading time of the incident compression wave,the more seriously the specimens are fragmented;The specimen fragmentation modes simulated by the JH-2model are in agreement with those of the recovered specimens in SHPB test.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2010年第5期463-471,共9页
Explosion and Shock Waves
基金
国家空间碎片专题研究基金项目(kjsp06211)
