Abstract
Damage in brittle materials is characterized by micro-cracks. Interactions between micro-cracks can not be ignored when crack spacing is small. The influence of interactions on stress intensity factors is analyzed by a Westergaard stress function for collinear cracks arrays. A dynamic damage constitutive model for alumina subjected to uniaxial compression is developed based on the energy equilibrium principle of micro-cracking. A dynamic damage evolution equation was presented. The influence of nucleation parameter, initial length and crack spacing on the dynamic fracture toughness was discussed. The stress-strain curve resulted from our model has a good agreement with the experimental results.
| Original language | English |
|---|---|
| Pages (from-to) | 169-173 |
| Number of pages | 5 |
| Journal | Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology |
| Volume | 31 |
| Issue number | SUPPL.1 |
| Publication status | Published - Oct 2011 |
Keywords
- Alumina ceramics
- Dynamic damage constitutive
- Wing crack arrays