Comparison of critical plane models based on multiaxial low-cycle fatigue tests of 316L steel

An endurance against multiaxial fatigue of 316L steel is studied. A fatigue life curve of torsional mode is sub-stantially shifted to longer fatigue lives while tension/compression mode causes fracture the earliest. Fatigue life curves of both multiaxial modes are close to axial mode. Fourteen critical plane models for fatigue life pre-dictions were applied and compared. Modified Smith-Watson-Topper models proved to be the most accurate. Criteria proposed by Fatemi and Socie, Li et al., Zhu et al. and by Wang and Brown provided satisfactory results as well. Smith-Watson-Topper model led to the most precise predictions of fatigue crack orientation.

Automated summary

The endurance of 316L steel against multiaxial fatigue is examined. The fatigue life curve for torsional mode extends to longer fatigue lives, while tension/compression mode causes the earliest fracture. The fatigue life curves for both multiaxial modes are similar to the axial mode. Fourteen critical plane models for fatigue life predictions were applied and compared. The modified Smith-Watson-Topper models prove to be the most accurate. The criteria proposed by Fatemi and Socie, Li et al., Zhu et al., and Wang and Brown also produce satisfactory results. The Smith-Watson-Topper model leads to the most precise predictions of fatigue crack orientation.