Criteria for Crack Branching and Crack Arrest.
WASHINGTON UNIV SEATTLE DEPT OF MECHANICAL ENGINEERING
Pagination or Media Count:
Dynamic photoelastic data on crack branching and crack arrest in edge-cracked tension plates with and without reinforcing stringers were re-evaluated and the averaged static and dynamic strain energy release rates, G ave and G sub D ave were determined. It was found that when G sub D ave G sub c, which is the critical strain energy release rate, the crack would continue to run although the instantaneous static strain energy release rate, G, could be less than G sub c. Likewise, the crack arrested when G sub D ave divided by G sub c and G G sub c. Crack branching occurred when G ave or 5 G sub D ave. For a running crack initiated by projectile impact, the current impact energy after dissipation must be estimated if its influence is to be incorporated in the above crack arrest and crack branching criteria.
- Metallurgy and Metallography