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In this work is indicated how it could be possible to evaluate the limit stress  of the thermo-elastic phase of deformation by thermo-analysing the surface of  the specimen during a static traction test. Adding the temperature curve  measured on a small area of the surface (the hottest) to the classic  stress-strain curve, it is possible to evaluate a limit temperature T0  coincident with the beginning of the non linear trend of the curve. The  corresponding stress value is coincident with the fatigue limit of the analyzed  component. As an example, the results of traction tests performed on two notched  specimens, where the change of linearity in the temperature curve during static  traction test was evident, are reported. The corresponding value of stress was a  good approximation of the fatigue limit for R = - 1, determined by the  conventional method. The aim of the reported examples in this paper must be  interpreted as support to the basic principle of the method and not as the  results of a complete experimental planning of which we will comment in an  another occasion

Fatigue limit by thermal analysis of specimen surface in mono axial traction test