Analysis of Thermal Stress in Fatigue Fracture Specimen using Lock-in Thermography

This paper aims to describe thermal stress measurement using Lock-in Thermography as a non-destructive testing method with real time and non-contact technology. Due to the first and second principles of thermodynamics, there is a relationship between temperature and mechanical behaviour laws. Lock-in Thermography is classically used to measure linear thermo-elastic effect to evaluate stresses in structures under periodic, random or transient loading condition. For this study, the followings are performed to analyse and to locate thermo-mechanical mechanism in fatigue fracture specimen materials and structures.