期刊 冲击压缩下氧化铝陶瓷中破坏阵面的传播  被引量:10

PROPAGATION OF FAILURE FRONT IN SHOCK-LOADED POLYCRYSTALLINE ALUMINA

作  者:刘占芳[1] 常敬臻[1] 姚国文[2] 张凯[1] 李建鹏[1] 

机构地区:[1]重庆大学工程力学系 [2]重庆交通学院土木建筑学院

出  处:《力学学报》2006年第5期626-632,共7页Chinese Journal of Theoretical and Applied Mechanics

PROPAGATION OF FAILURE FRONT IN SHOCK-LOADED POLYCRYSTALLINE ALUMINA

基  金:国家自然科学基金委员会与中国工程物理研究院联合基金项目(10376046);国家自然科学基金(10572158)资助项目.~~

摘  要:进行了平面冲击波压缩下氧化铝陶瓷中破坏阵面的实验测试和理论探索.通过氧化铝陶瓷的平板碰撞实验,借助VISAR测试系统测量了试件自由面的质点速度历程,并对回收试件进行了电镜扫描观察.质点自由面速度历程曲线表明,氧化铝陶瓷材料中存在破坏阵面的传播.考察了破坏阵面的传播特性,给出了陶瓷材料的动态破坏模型,并对破坏阵面的传播进行了数值分析.

The experimental measurement and theoretical analysis were conducted to study dynamic failure behaviors of brittle alumina under shock loadings. Plate impact experiments were carried out on alumina, where the free surface velocity profiles were measured through VISAR and the recovered samples were scanned with SEM. The SEM observation shows that the principal factor controlling the inelastic deformation and failure process is the mesoscopic configuration of ceramics. With the particle free surface velocity history in alumina ceramics under shock-loadings compared with that in glass, the recompression signals in alumina may be obtained, which are similar to those in glass where failure waves have been widely verified. It is shown that the recompression signal appears in advance of the compressive shock unloading whether in alumina or glass. The failure front propagates in the material when the particle velocity history at free surface is checked. Dynamic failure properties of the failure front in alumina are discussed. A dynamic failure model of shock-loaded alumina and the governing equation of failure front propagation along with a respective failure criterion are obtained. Numerical results on the propagation of failure front in terms of longitudinal and transverse stresses in alumina are presented.

关 键 词:氧化铝陶瓷 平板碰撞实验 破坏阵面 破坏模型 冲击强度 

alumina  plate impact experiment  failure front  failure model  impact strength 

分 类 号:O347.3[理学—固体力学]

 

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