Analysis on the fatigue damage evolution of notched specimens with consideration of cyclic plasticity |
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Authors: | F Shen G Z Voyiadjis W Hu Q Meng |
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Affiliation: | 1. Institute of Solid Mechanics, School of Aeronautics Science and Engineering, Beihang University, Beijing, China;2. Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA, United States |
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Abstract: | This paper presents a damage mechanics method applied successfully to assess fatigue life of notched specimens with plastic deformation at the notch tip. A damage‐coupled elasto‐plastic constitutive model is employed in which nonlinear kinematic hardening is considered. The accumulated damage is described by a stress‐based damage model and a plastic strain‐based damage model, which depend on the cyclic stress and accumulated plastic strain, respectively. A three‐dimensional finite element implementation of these models is developed to predict the crack initiation life of notched specimens. Two cases, a notched plate under tension‐compression loadings and an SAE notched shaft under bending‐torsion loadings including non‐proportional loadings, are studied and the predicted results are compared with experimental data. |
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Keywords: | continuum damage mechanics cyclic plasticity elasto‐plastic fatigue damage fatigue life notched specimens |
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