The design and operating of a portable holographic interferometer for residual stress analysis by creating a small scratch along with a new mathematical algorithm of calculations are discussed. Preliminary data of the stress investigations on aluminum and steel alloys have been obtained by the automatic processing of the interference pattern using a notebook computer. A phase-shift compensation technique in real-time reflection interferometry is used to measure the out-of-plane stress release surface displacement surrounding a small scratch (25 um depth and 0.5 mm width) in a plate with residual stress of around 50 MPa. Comparison between theoretical models for a rectangular and triangular shaped scratch with the experimental data are presented.
@article{arxiv.1304.3141,
title = {Advanced holographic nondestructive testing system for residual stress analysis},
author = {Anatoli Kniazkov and Yuri Onischenko and George Dovgalenko and Gregory Salamo and Tatiana Latychevskaia},
journal= {arXiv preprint arXiv:1304.3141},
year = {2013}
}