Characterization of the fatigue behaviour and lifetime evaluation of metallic materials based on thermographic NDT-methods

摘要

The fatigue behaviour of a metallic material can be characterized by extracting the material response during cyclic loading. Due to the good heat conductivity of metallic materials, thermographic NDT-methods are well suited to visualize and record the dissipated heat energy of specimens during cyclic loading, which is correlated mainly with the plastic deformation caused by the applied mechanical work. The acquired data can serve as a feed-in for short-time procedures or fatigue life calculation methods. In the framework of this paper, load increase and constant amplitude tests were performed and the cyclic deformation behaviour was traced by an infrared camera system.