An apparatus based upon the Davies and Kolsky modifications of the Hopkinson pressure bar, and including a plane polariscope, was used to measure the dynamic stress-optic coefficient of a bar of Perspex whilst the material was being subjected to a stress cycle of about 50 microseconds duration. A value of 11 Brewsters was obtained for the coefficient of the particular sample of Perspex used, compared with a value of 23 4 Brewsters obtained by subjecting the same specimen to a static load.
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David F. Marshall (1957) studied this question.
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