Determination of Fatigue Limit by Mono-Axial Tensile Specimens Using Thermal Analysis
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.
A. Saimoto and M.H. Aliabadi
A. Risitano et al., "Determination of Fatigue Limit by Mono-Axial Tensile Specimens Using Thermal Analysis", Key Engineering Materials, Vols. 452-453, pp. 361-364, 2011