Crack path under non-proportional fatigue loading — Evaluating tests with existing crack growth direction criteria
article
Proper descriptions of the fatigue crack growth rate and direction are crucial for determining the residual fatigue life of metallic structures. In non-proportional multi-axial loading, the prediction of the fatigue crack growth direction is not trivial. This study evaluates the effect of different state-of-the-art crack growth direction criteria on the predicted crack paths by comparing the results with experiments with non-proportional load done by others. The results are compared in terms of predicted angles at different experimental crack lengths and cumulative predicted crack path. Based on this study, it is concluded that none of the studied criteria based on linear elastic fracture mechanics is able to accurately predict the crack growth direction in non-proportional loading for the general case. The mismatch of some cases studied is so large that these criteria cannot be used in crack growth path prediction for an arbitrary, non-proportional load case.
Topics
TNO Identifier
1023429
Source
Theoretical and Applied Fracture Mechanics(141), pp. 1-21.
Article nr.
105069
Pages
1-21