A two-dimensional stress state is analyzed using the interferometric photoelasticity and the finite element method (FEM) separately to compare the accuracy of the results obtained by the respective methods. “A strip with a central hole under tension” is chosen as the two-dimensional stress problem because it is a well known case which has been solved rigorously by Howland. The results show that, so far as the stress concentration factor is concerned, the accuracy of the FEM depends entirely on the member of finite elements especially near the hole, while the interferometric method constantly gives satisfactory values provided that sufficiently plane-parallel model plated are prepared.
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