【作者】 孙占峰； 徐辉； 彭建祥； 李平； 贺红亮； 李庆忠；

【Author】 SUN Zhan-feng~1,XU Hui~2,Peng Jian-xiang~1,LI Ping~1,HE Hong-liang~1,LI Qing-zhong~1 (1.National Key Laboratory of Shock Wave and Detonation Physics,Institute of Fluid Physics,CAEP, Mianyang 621900,China; 2.College of Mathematics and Computer Science,Mianyang Normal University,Mianyang 621000, China)

【机构】 中国工程物理研究院流体物理研究所冲击波物理与爆轰物理国防科技重点实验室； 绵阳师范学院数学与计算机科学学院；

【摘要】 利用高压声速研究AD95氧化铝陶瓷的冲击压缩损伤。采用VISAR技术连续测量了AD95陶瓷在高速冲击下的样品-窗口界面的加载和卸载过程的粒子速度剖面,计算得到了雨贡纽状态高压声速和卸载声速,定义了高压声速降低率,并通过高压声速降低率随冲击应力的变化关系讨论了冲击压缩损伤状态。研究结果表明:AD95陶瓷的冲击压缩损伤,首先随着冲击应力的提高快速发展,对应的高压声速降低率迅速增大;当冲击应力达到45 GPa～50 GPa以上时,高压声速降低率(≈27%)的增长速度明显变慢,压缩损伤增长缓慢,可以认为此应力区间材料发生了完全压缩损伤。本文提出的方法是一种对陶瓷等脆性材料在冲击压缩下的损伤进行原位实时测量和表征的有效方法。更多还原

【Abstract】 Shock compressive damage of AD95 ceramics has been studied through high pressure sound velocity.The particle velocity profiles of the interface between sample and window during the loading and unloading process have been measured continuously by VISAR.Sound velocities in high pressure and during unloading process are calculated,and the decrease ratio of high pressure sound velocity is defined, further,the states of shock compressive damage are discussed through the relationship of the decrease ratio changing with the impact stress.Results indicate that the shock compressive damage of AD95 ceramics develops rapidly with the increase of impact stress firstly,which deduced from the increase of decrease ratio.When the impact stress is greater than 45 GPa to 50 GPa,the increase of decrease ratio is decelerated markedly,so we can conclude that the compressive damage develops slowly,and in this stress region the material can be regard as complete damaged.The method put forward above is a in situ and real-time measurement and characterization of the shock compressive damage of brittle materials such as ceramics.更多还原