Abstract
This paper describes the results of mechanical and optical measurements in plasticized polyvinyl chloride under conditions of creep and relaxation at room temperature. It covers one task of a broader investigation aimed at developing experimental methods for viscoelastic stress analysis.
The moiré method of strain analysis was found well suited for continuous recording of axial and transversal deformation in creep tests.
The material exhibits linear viscoelastic behavior, both mechanical and optical. Strain, stress and birefringence measured from creep and relaxation tests gave straightline plots on log-log scale and, thus simple empirical formulas were possible to derive. The theoretical prediction that birefringence in a linear viscoelastic material not exhibiting flow can be expressed as a linear relationship of stress and strain was satisfactorily substantiated.
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Daniel, I.M. Quasi-static properties of a photoviscoelastic material. Experimental Mechanics 5, 83–89 (1965). https://doi.org/10.1007/BF02323212
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DOI: https://doi.org/10.1007/BF02323212