Errors in stress determination at the free boundaries of "frozen stress" photoelastic models

Abstract

An attempt has been made to list the errors, apart from those due to the use of imperfect material, which may occur in the determination of free boundary stresses from direct relative retardation observations on slices cut from "frozen stress" photoelastic models and, where possible, to estimate their magnitudes. Particular regard is paid to the important case of a stress concentration, where small radii will introduce errors which would be negligible at other points on the boundary.