Abstract
This work provides a damage accumulation algorithm to calculate low cycle fatigue life under multiaxial irregular loading path, using an intuitively constructed energy-based parameter which combines both cyclic plastic work and non-proportional (NP) hardening effect. The cumulative fatigue damage is calculated according to actual shape of the loading path, which is different from the traditional damage accumulation models that consider block sequence effect. The effectiveness of this proposed damage accumulation algorithm has been validated by experimental results of 316L stainless steel under nine regular loading paths and nine irregular multiaxial loading paths.
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