Abstract
Formerly, a method for analysing the stress state in the plastically flowing transparent plane model by using the stress birefringence was proposed as a model test for studying the metal forming process or creep deformation. In this paper, the values of constants contained in the fundamental relations of the method are determined by the calibration test with a softened celluloid specimen. From the results of calibration test, it becomes clear that the value of principal stress difference in the plastically flowing body may be estimated from the fringe order appearing in it within a few percent of error independent of the values of stress rate and principal stress ratio as far as the latter value is negative.
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