Estimating the multiaxial fatigue behaviour of C45 steel specimens by using the energy dissipation

Energy-based approaches are adopted in fatigue analysis of materials, components and structures. Several methods consider thermal energy, which results from energy conversion of the mechanical energy expended for applying cyclic fatigue loadings. By exploiting the self-heating phenomenon, the specific heat energy can be measured during laboratory fatigue tests in a rather simple and efficient way. In previous papers, the specific heat loss has been adopted to correlate fatigue test data relevant to pure axial and pure torsional fatigue loadings. In this paper, it is adopted to correlate successfully fatigue test data generated under in-phase and out-of-phase axial/torsional multiaxial fatigue loadings.