| Citation: | LI Jing, HUA Tengfei, LIU Hao, et al. Biaxial fatigue life prediction model based on the shear strain energy density for axial-torsional loading[J]. Journal of Aerospace Power, 2025, 40（5）：20230574 doi: 10.13224/j.cnki.jasp.20230574
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A shear strain-energy-density-based multiaxial fatigue life prediction model was proposed after analyzing the draw-backs of the Fatemi-Socie model. In this developed criterion, the critical plane was defined as the plane of maximum shear strain range with larger normal strain. Step-by-step procedures were outlined to determine the orientation of the defined critical plane, the material constants and the damage parameters incorporated in the proposed model. Besides, the reliability of the developed criterion was systematically validated using the experimental data through testing of 6 kinds of materials. It was found that the mean shear stress modified by the introduced mean shear stress sensitivity coefficient can reflect not only the different degrees of sensitivity of materials to mean shear stress, but also the influence of mean shear stress on multiaxial fatigue damage of materials. Under the proportional, non-proportional, and asymmetric loadings, 100%, 93.2%, and 90.4% of the predicted results fell within the factor-of-three boundary, respectively.
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