VALIDATION OF MULTIAXIAL FATIGUE MODELS FOR STRUCTURAL STEELS

L. Reis  B. Li  M. Freitas      

Anales de la Mecánica de la Fractura, nº 23 . 2006 . Pág. 57 -62
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Resumen: There are many multiaxial fatigue models proposed in the literature, and many corresponding approaches have been developed for evaluating the shear stress amplitude under multiaxial fatigue loading conditions. For efficient computational fatigue analysis of components and structures, it is required to carry out further validations of multiaxial fatigue models and appropriate approaches for shear stress evaluation under service loading conditions. In this paper, systematic fatigue experiments are presented for a structural steel, 42CrMo4, under typical axial-torsional multiaxial loading paths. Tests were carried out in high cycle fatigue regime, 105 – 106 cycles. The same von Mises equivalent stress was applied in different loading paths with several ratios of shear stress/normal stress. Then the experimental fatigue life results are analysed and correlated with the fatigue damage parameter which were evaluated in the new proposed shear stress space. The MCE approach is used for evaluating the shear stress amplitude and improved correlations are shown.

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Instituto Superior Técnico, Lisboa
Instituto Superior Técnico, Lisboa
Instituto Superior Técnico, Lisboa