Justus Medgenberg, Thomas Ummenhofer
May 26, 2013
Modern infrared (IR) thermography as a non-contacting, high resolution and full-field measurement technique offers a promising tool for various applications in experimental fatigue studies. Despite the tremendous advances in IR-camera, computer and data processing technology, infrared measurements have so far rarely been applied to the assessment of localized fatigue phenomena. The aim of this paper is to present basic considerations and experimental results of an application of infrared thermography for damage studies during fatigue tests on mild steel S355. For this purpose high-resolution infrared image sequences have been acquired during high cycle fatigue testing. The data is analyzed with respect to linear thermoelastic and nonlinear phenomena, which allows characterizing the local fatigue behavior. Experimental studies on unnotched, mildly notched, and welded specimens under different testing conditions are presented. The results confirm the high potential of the application of infrared thermography during experimental fatigue studies.