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| Size dependent strength of composite ceramic with arc-cracks |
| Received:August 28, 2010 Revised:January 10, 2011 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20121015 |
| KeyWord:composite ceramic with arc-cracks micromechanical stress field failure stress strain energy release rate size dependent strength |
| Author | Institution |
| 刘协权 |
军械工程学院 基础部, 石家庄 |
| 付云伟 |
军械工程学院 基础部, 石家庄 |
| 倪新华 |
军械工程学院 基础部, 石家庄 |
| 程兆刚 |
军械工程学院 基础部, 石家庄 |
| 赫万恒 |
军械工程学院 基础部, 石家庄 |
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| Abstract: |
| The composite ceramic with arc-cracks was simplified to the random three phase cell and effective medium.The strength and damage of composite ceramic were researched by micro-mechanics.Firstly,the external strains of three-phase cell is determined.Then based on the micromechanical stress field and generalized thermodynamic force in damage process,the damage equivalent stress in the matrix and particle can be computed.As the damage equivalent stresses of the matrix and particle are equal to the ultimate stresses of the matrix and particle respectively,the fracture stresses of the matrix and particle in composite ceramic will be given.Finally,the strain energy release rate of arc-crack is computed by mixed-mode crack stress intensity factor,and the failure stresses of interface can be further gotten.At last,the size dependent strength of composite ceramic with arc-cracks is obtained by considering comprehensive damage effect of matrix,particle and interface. |
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