|
|||||
|
|
| PROGRESSIVE FRAGMENT MODELING OF FAILURE WAVE IN CERAMICS UNDER PLANAR IMPACT LOADING | |
| 作者姓名： | 姚国文 刘占芳 黄培彦 |
| 作者单位： | School of Civil Engineering and Architecture Chongqing Jiaotong University Chongqing 400074 P. R. China，Department of Engineering Mechanics Chongqing University，Chongqing 400044 P. R. China，College of Traffic and Communications South China University of Technology，Guangzhou 510640 P. R. China |
| 摘 要： | Polycrystalline ceramics have heterogeneous meso-structures which result in high singularity in stress distribution. Based on this, a progressive fragment model was proposed which describes the failure wave formation and propagation in shocked ceramics. The governing equation of the failure wave was characterized by inelastic bulk strain with material damage and fracture. And the inelastic bulk strain consists of dilatant strain from nucleation and expansion of microcracks and condensed strain from collapse of original pores. Numerical simulation of the free surface velocity was performed in good agreement with planar impact experiments on 92.93％ aluminas at China Academy of Engineering Physics. And the longitudinal, lateral and shear stress histories upon the arrival of the failure wave were predicted, which present the diminished shear strength and lost spall strength in the failed layer. |
| 关 键 词： | 失效波 分级片段模型 氧化铝陶瓷 碰撞实验平台 |
| 收稿时间： | 2004-05-18 |
| 修稿时间： | 2005-10-31 |
Progressive fragment modeling of failure wave in ceramics under planar impact loading |
|
| Guo-wen Yao,Zhan-fang Liu,Pei-yan Huang.PROGRESSIVE FRAGMENT MODELING OF FAILURE WAVE IN CERAMICS UNDER PLANAR IMPACT LOADING[J].Applied Mathematics and Mechanics(English Edition),2006,27(2):215-220. | |
| Authors: | Guo-wen Yao Zhan-fang Liu Pei-yan Huang |
| Institution: | 1. School of Civil Engineering and Architecture, Chongqing Jiaotong University,Chongqing 400074, P. R. China 2. Department of Engineering Mechanics, Chongqing University,Chongqing 400044, P. R. China 3. College of Traffic and Communications, South China University of Technology,Guangzhou 510640, P. R. China |
| Abstract: | Polycrystalline ceramics have heterogeneous meso-structures which result in high singularity in stress distribution. Based on this, a progressive fragment model was proposed which describes the failure wave formation and propagation in shocked ceramics. The governing equation of the failure wave was characterized by inelastic bulk strain with material damage and fracture. And the inelastic bulk strain consists of dilatant strain from nucleation and expansion of microcracks and condensed strain from collapse of original pores. Numerical simulation of the free surface velocity was performed in good agreement with planar impact experiments on 92.93% aluminas at China Academy of Engineering Physics. And the longitudinal, lateral and shear stress histories upon the arrival of the failure wave were predicted, which present the diminished shear strength and lost spall strength in the failed layer. |
| Keywords: | failure wave progressive fragment model alumina ceramics heterogeneous meso-structures plate impact experiment |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ | |
| 点击此处可从《应用数学和力学(英文版)》浏览原始摘要信息 | |
| 点击此处可从《应用数学和力学(英文版)》下载免费的PDF全文 | |