Interference Fringe Analysis of Al-Mg Alloy by Dynamic Electronic Speckle Pattern Interferometry

The Electronic Speckle Pattern Interferometry (ESPI) technique is a promising tool for full-field deformation analysis. It is especially well-suited for investigating materials that exhibit non-uniform deformation. An example of such behavior is the Portevin-Le Chatelier (PLC) effect observed in aluminum alloys. In this study, we utilized ESPI to visualize the deformation behavior of aluminum alloys during tensile testing and investigated the mechanisms based on field theory. To fully understand the mechanisms governing deformation and eventual fracture, it is essential to analyze the numerous interference fringe patterns visualized through ESPI. Therefore, the automation of fringe pattern analysis using computational techniques is highly desirable. In this presentation, we introduce a novel analytical method for interpolating the phase information of the visualized fringes. This method enables phase analysis of all frames captured, allowing us to capture the sequence of mechanisms from the start of deformation to fracture.