This study uses a photoelastic coating method in spur gear stress analysis, and verifications of the results are made with two-dimensional boundary element analysis. The principal advantage of the photoelastic coating method comes from the fact that it is a full-field technique capable of showing the entire stress distribution over the surface of a part and thus highlighting the regions where the stresses are the largest. The general results of experimental work in which spur gears are analyzed, both in test fixtures and in loading conditions at the critical points, are presented in order to measure actual tooth root, tooth fillet, and blank stresses.
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