A multiaxial stress-based fatigue failure model considering ratchetting-fatigue interaction

Based on the experimental results, a uniaxial stress-based fatigue failure model was first proposed to predict the fatigue life by addressing uniaxial ratchetting-fatigue interaction. In the uniaxial model, the fatigue and ratchetting damages were reflected by axial stress amplitude and maximum axial stress, respectively. A parameter FP was defined by introducing a weight factor of ratchetting damage and correlated with the life. Then, the model is extended to multiaxial version by adding a factor describing the effect of multiaxial loading path. The proposed model provides good prediction to the uniaxial and multiaxial fatigue lives of the materials with different cyclic softening/hardening features. (C) 2009 Elsevier Ltd. All rights reserved.