Strain-based and energy-based model are proposed for the evaluation of very-low cycle fatigue life considering multi-axial stress states. In the strain-based model, based on void growth and shrinkage, the void shrinkage ratio is proposed as a function of the plastic strain range. The energy-based model is developed by considering stress triaxiality in the relationship between fatigue life and fracture strain energy. For validation, two models are determined using smooth and notched bar tensile test and best-fit fatigue life curves of SA508 Gr.3 and TP316L. Fatigue lives predicted by both models are within 85% of experimental values in all cases.
Bibliographical noteFunding Information:
This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (No. 20193110100020, No. 20181510102380).
© 2021 Elsevier Ltd
- Finite element analysis
- Notched C(T) test
- Very low cycle fatigue life evaluation
ASJC Scopus subject areas
- Modelling and Simulation
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
- Industrial and Manufacturing Engineering