Identification of Self-Heating Phenomena Under Cyclic Loadings Using Full-Field Thermal and Kinematic Measurements: Application to High-Cycle Fatigue of Seam Weld Joints

The purpose of this work is to extend the use of full field measurements (kinematical and thermal) to the identification of the high cycle fatigue properties of seam weld joints. A self-heating test under cyclic loading is carried out on a seam weld joint. During the test, displacement and temperature fields of the specimen are measured by Stereo Digital Image Correlation (SDIC) and Infra-red (IR), respectively. Then a suitable numerical strategy is proposed to identify a given thermal source model. Thus, a correlation between the change of the seam weld dissipative source and the expected mean fatigue strength of the assembly is successfully recovered.