Author(s)

T. Boulanger, A. Chiysochoos, C. Mabru & A. Galtier

Abstract

Analysis of heat sources induced by fatigue loading T. ~ o u l a n ~ e r ' , A. ~ h r ~ s o c h o o s ~ , C. ~ a b r u ~ & A ~ a l t i e r ~ 1 Laboratoire de Me'canique et Ge'nie Civil, Universite' Montpellier II CNRS, France 2 De'partement Ge'nie Me'canique, Ecole Nationale Supe'rieure d'lnge'nieurs de Constructions Ae'ronautiques, France "IRSID-ARCELOR Group, France Abstract The fatigue of dual phase steel has been analyzed in terms of calorimetric effects. A simplified method has been proposed to derive heat sources from thermal images provided by an infrared camera. Thermoelastic and dissipative sources have then been separately estimated. Concerning the thermoelastic effects, experimental results were in good agreement with theoretical predictions. We also observed an intrinsic dissipation increasing with the loading frequency and the loading amplitude. 1 Introduction The fatigue limit estimate is classically carried out after a statistical processing of many tests and remains a long a

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