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The energy dissipated to the surroundings as heat in a unit volume of material per cycle, Q, wasrecently proposed by the authors as fatigue damage index and it was successfully applied to correlate fatiguedata obtained by carrying out fully reversed stress- and strain-controlled fatigue tests on AISI 304L stainlesssteel plain and notched specimens. The use of the Q parameter to analyse the experimental results led to thedefinition of a scatter band having constant slope from the low- to the high-cycle fatigue regime. In this paperthe energy approach is extended to analyse the influence of mean stress on the axial fatigue behaviour of unnotchedcold drawn AISI 304L stainless steel bars. In view of this, stress controlled fatigue tests on plainspecimens at different load ratios R (R=-1; R=0.1; R=0.5) were carried out. A new energy parameter is definedto account for the mean stress effect, which combines the specific heat loss Q and the relative temperaturevariation due to the thermoelastic effect corresponding to the achievement of the maximum stress level of thestress cycle. The new two-parameter approach was able to rationalise the mean stress effect observedexperimentally. It is worth noting that the results found in the present contribution are meant to be specific forthe material and testing condition investigated here

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The specific heat loss combined with the thermoelastic effect for an experimental analysis of the mean stress influence on axial fatigue of stainless steel plain specimens