PHOTOELASTIC PROCESSES FOR EXAMINING MECHANICAL STRESSES

摘要

A process of visualizing the maximum-shear lines or isostatics by observations under polarized light of the double refractions appearing in a photoelastic material comprises obtaining by means of a noval polariscope device moire images by observing simultaneously the material and a grid for the isostatics for different successive orientations of the plane of polarization. The successive orientations are obtained by simultaneously rotating the plane of the polarized light and the grid. One at least of the material and the grid is observed in the form of an optical image formed in the plane of the other.