Résumé
The fatigue of dual phase steel was examined in terms of calorimetric effects in order to match the energy manifestations offatigue and constitutive equations drawn up in a thermomechanical framework. A simplified method, assuming a homogeneousfatigue test, is proposed to determine heat source development from a temperature field provided by an infrared camera. Thermoelas-tic and dissipative sources were then separately identified. Experimental results concerning thermoelastic effects are in close agree-ment with theoretical estimates. Dissipation depends on the loading frequency and stress amplitude applied to the fatigue specimen.However, as the marked decrease in dissipation observed when testing a block at high stress was not easily interpretable in termsof material effects, we questioned the homogeneous fatigue test assumption.