Abstract
This paper uses photoelasticity and digital image analysis to develope an algorithm for determining stress intensity factors (SIFs) in 90° reentrant corners. To utilize the advantage of “whole-field” photoelasticity and to minimize the random experimental errors, the overdeterministic least squares method of Sanford combined with Newton-Raphson method is used to obtain SIFs. The algorithm is used to determine SIFs in plates with 90° reentrant corner(s) and the obtained SIFs agree well with the available numerical and theoretical values.
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