Sintesi del comportamento a fatica a trazione alterna di un acciaio inossidabile in termini di energia dissipata

The energy dissipated to the surroundings as heat for unit volume of material per cycle, Q, was recently proposed by one of the authors as fatigue damage indicator and it was successfully applied to synthesise fatigue data obtained by carrying out stress controlled and strain controlled fatigue tests on AISI 304 L stainless steel plain specimens. In this paper, after showing that the Q parameter is independent on the thermal boundary conditions occurring during experiments, new fatigue test results obtained by means of stress controlled fatigue tests on notched specimens are presented. It was found that all available fatigue data can be synthesised in terms of Q in a unique scatter band, independently on the testing conditions (stress or strain controlled fatigue tests) and on the specimens’ geometry (plain or notched material). Finally, some limitations of applicability of the proposed energy-approach is discussed.