Fatigue Strength Assessment of Components with V-Shaped Notches Based on

This paper proposes the deviatoric strain energy density evaluated over a finite-size volume surrounding the notch tip as an engineering quantity for predicting the fatigue limit of notched components subjected to uniaxial and multiaxial loading. This deviatoric strain energy density is given in closed form on the basis of the notch stress intensity factors corresponding to different loading modes, whereas the size of the volume is regarded as a material parameter. Such a quantity fully addresses the plasticity presence as well as the microstructural effects in the close neighborhood of the notch tip. Only requirements are Mode I high cycle fatigue conditions and a linear elastic finite element analysis in order to specify geometrical coefficients. The results obtained from the proposed model are in good agreement with experimental data taken from the literature related to welded tube-to-flange joints subjected to pure bending, pure torsion and combined bending and torsion.