Abstract
The stress relaxation behaviour of high impact polystyrene has been correlated with the microstructural changes observed in tensile tests. The inhomogeneity of plastic deformation, manifested as stress whitening, has been measured using microhardness tests. This method has been found to be sensitive to the amount of crazing in the material. The stress relaxation behaviour changed at the onset of crazing, but did not change appreciably as the volume fraction of crazes increased. An analysis of the relaxation in terms of a site population model based on White's approach suggests the macroscopic stress relaxation is related to the crazes in the boundary regions between the stress whitened and unwhitened material.
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Shinozaki, D.M., Klauzner, A. Stress relaxation of high impact polystyrene. J Mater Sci 26, 5865–5872 (1991). https://doi.org/10.1007/BF01130126
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DOI: https://doi.org/10.1007/BF01130126