Liu X.-Q.,Ordanance Engineering College |
Fu Y.-W.,Ordanance Engineering College |
Ni X.-H.,Ordanance Engineering College |
Cheng Z.-G.,Ordanance Engineering College |
He W.-H.,Ordanance Engineering College
Jisuan Lixue Xuebao/Chinese Journal of Computational Mechanics | Year: 2012
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.