A new iteration method for the thermographic determination of fatigue limit in steels

This paper presents a new thermographic method based on an iteration procedure for the determination of the fatigue limit of materials and components. This method is utilised to determine the fatigue limit of a mild steel Fe 510. Standard and notched specimens with semicircular notch have been fatigue tested by means of alternate symmetric (tension-compression) loads. The thermographic results have been compared to the corresponding obtained by means of a different thermographic method available in literature. These results have also been compared to those obtained by means of the Staircase Method or calculated by means of UNI Standard.