Application Examples for Detection of Residual Stress Tension in Aluminium Sheet Metal

This paper is about an application of a previous theoretical work and publication. The application is about the detection of residual stress/strain tension in aluminium sheet metal; the theory is based on the hypothesis that the areas (clusters) where residual stress/strain tensions are more present, are directly linked to the discontinuity of the material; these clusters of discontinuity are due to little morphological variations caused by the heat of the lasers used to cut the sheet metal. These morphological variations of the material lead to discontinuity in conductivity of the material itself. This procedure shows how to “read” clusters of thermographic images to detect residual stress/strain tension; it will be examined two 2024 aluminium alloy sheet metal with holes. All the analysis problem is to detect the presence of gradient of conductivity in the sheet metal.