Comparison Between 0D and 1D Heat Source Reconstruction for Fatigue Characterization

Abstract

Material fatigue damage is associated with heat production leading to material self-heating. In this context, measuring temperature fields on a specimen’s surface by infrared thermography is useful to analyze the fatigue response of the tested material. Calorific information can be also obtained by reconstructing the heat power density (heat sources) at the origin of the temperature changes. In particular, mechanical dissipation due to fatigue damage can be determined from the thermal response using specific temperature acquisition conditions. The processing is based the heat diffusion equation, whose different formulations have been proposed in the literature to perform heat source reconstruction. The present study compares two approaches for homogeneous fatigue tests, namely the zero-dimensional (0D) and one-dimensional (1D) approaches. The error generated by the 0D approach (compared to the 1D approach) was first determined from a model. For comparison purposes, experimental tests were performed on a copper specimen. Consequences of using the 0D processing for fatigue analysis are discussed.