Basic study on micro-tomographic diagnosis of residual stress inside laser-welded polymer matrix composites using Optical Coherence Stressgraphy

Abstract

In this study, a novel tomographic system of stress visualization (OCSE) is proposed on the basis of PS-OCT, which can provide stress tomography from photo elastic interference fringe pattern at a cross-section, even when sample is turbid material under anisotropic stress distribution (not plane stress condition).In this experiment, OCSE was applied to laser welded material of PAR and PBT/PC alloy material．As a result, this system can offer the proposed method can non-destructively visualize the internal stress distribution at the micrometer resolution. Consequently, it was concluded that there is a correlation between internal stress and laser conditions.