Abstract
This work aims to estimate the residual stress relaxation during cyclic loading and the fatigue strength for the case of the 42CrMo4 nitrided steel. An original numerical methodology with Abaqus software has been established to determine the residual stress redistribution under fatigue loading. An important reduction of the residual stress is observed after the first cycles (45 to 60%) caused by the plastic deformation resulting from the superposition of residual stress and applied stresses. An experimental investigation was conducted by caring out 3-points bending fatigue tests on nitrided steel samples. The 42CrMo4 steel behaviour was described using the Chaboche model coupling isotropic and nonlinear kinematic hardening where the coefficients are identified experimentally. Residual stresses profiles measured by XRD methods where used to validate the proposed numerical methodology. It has been established that considering of the stabilised residual stress enhances the predictive ability of the polycyclic fatigue criteria.
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Bechouel, R., Ben Moussa, N., Terres, M.A. (2019). Improvement of the Predictive Ability of Polycyclic Fatigue Criteria for 42CrMo4 Nitrided Steels. In: Benamara, A., Haddar, M., Tarek, B., Salah, M., Fakher, C. (eds) Advances in Mechanical Engineering and Mechanics. CoTuMe 2018. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-19781-0_26
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