Abstract
The birefringent effect of viscoelastic and viscoplastic polymeric materials is considered and shown to have separate contributions from the stress, recoverable strain and the permanent deformations. Experimental data for a number of materials are discussed and the procedure for analyzing these data described.
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Doyle, J.F. An interpretation of photoviscoelastic/plastic data. Experimental Mechanics 20, 65–67 (1980). https://doi.org/10.1007/BF02321036
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DOI: https://doi.org/10.1007/BF02321036