Dissipative Behaviour of Metallic Materials in Low Stress Cyclic Loading
In order to fully understand the thermomechanical phenomena involved in high-cycle fatigue, a method for determining the dissipative thermal sources in a loaded metallic specimen from the spatio-temporal integration of the heat diffusion equation is proposed. Temperature fields obtained through a focal array infra-red camera are processed with this technique. After a refined analysis of the sensitivity of the method, preliminary tests have shown that it is possible to detect a burst of heat sources within the first couple of cycles for the specimen tested above a certain level of tensile stress. This behaviour is thought to be related to the microplasticity level.
J.M. Dulieu-Barton and S. Quinn
F. Maquin and F. Pierron, "Dissipative Behaviour of Metallic Materials in Low Stress Cyclic Loading", Applied Mechanics and Materials, Vols. 3-4, pp. 253-258, 2005