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Deformation Processes in High Impact Polystyrene as Revealed by Analysis of Arrested Cracks by L. Rios-Guerrero; H. Keskkula; D.R. Paul is a Materials Science article available to read on EtoBox.

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Fracture of rubber-toughened polystyrene (HIPS) has been studied via post-mortem analysis of specimens with arrested cracks formed under impact loading conditions. This methodology involves the study of the deformed region around an arrested crack tip by electron microscopy. It was applied to two commercial HIPS products and two experimental products with sub-micron rubber particles. For the HIPS materials, the arrested crack tip has a blunted shape with a width from 50 to 100 mm depending of the material and its impact resistance. As expected, massive crazing was found in all these materials around the crack. In a narrow zone just ahead of the crack tip, where the crack would have continued to grow if not arrested, considerable elongation and deformation of the rubber particles was observed. This zone appears to be the precursor of the crack. In this region, "dilatation" and "shear" bands of more than 50 mm long were observed. Higher magnification TEM observations show highly deformed rubber particles ("S" or "tear-drop" shape) along the shear bands of 1-6 mm width. Three different kind of cavitation was observed just ahead of the crack tip: (1) small voids inside the membranes of

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Author

L. Rios-Guerrero; H. Keskkula; D.R. Paul

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

2000

Language

EN

Field

Materials Science (Physical Sciences)