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A path-dependent multiaxial fatigue life estimation criterion for metals under various loading conditions
Ist Teil von
International journal of fatigue, 2021-08, Vol.149, p.106300, Article 106300
Ort / Verlag
Kidlington: Elsevier Ltd
Erscheinungsjahr
2021
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals
Beschreibungen/Notizen
•A new life reduction index is proposed and defined by using the strain-life curves.•Expression of the life reduction index is deduced based on the FS damage parameter.•Constitutive model is needless for the proposed method in centro-symmetric loading.•Good predictions are obtained for metals with/without non-proportional hardening.•The robustness of the proposed model is validated by using 1059 experimental data.
In this research, a new life reduction index is proposed for life prediction with the consideration of material’s non-proportional fatigue life reduction process. The new index has been deduced based on the Fatemi-Socie damage parameter. For the centro-symmetric loading, the proposed index can be applied to assess the fatigue life of material without requiring the complicated multiaxial constitutive algorithm, no matter whether the material is sensitive to the non-proportional hardening or not. The prediction accuracy and robustness of the proposed index has been extensively validated using about 1059 experimental data by testing 25 materials under 18 different loading paths.