Multiaxial fatigue criteria based on an integral approach: Justification of the superiority of this approach over the critical plane approach

In the context of a study on multiaxial criteria for aluminum alloy welded structures 6000, biaxial tests are carried out on equivalent structures (simulated ZAT) in the field of fatigue with a large number of cycles. Critical plan criteria and global criteria are verified using the Castem 2000 code. The predictions compared with the experimental results show that some criteria work better for certain types of loading. Global criteria seem to give better predictions than critical plan criteria.