Abstract
The effect of pre-orientation on nylon-6 at various temperatures reveals three types of fracture behaviour—(1) brittle (−196 and −150°C), (2) brittle/ductile (−100°C), and (3) ductile (above 100°C). Multiple fracture occurred in the brittle region, particularly with increasing degrees of pre-orientation. In the brittle/ductile transition region, there is evidence of ductility in the fractured specimen. Some evidence of flow is seen in the specimens pre-oriented up to 25%, but beyond that multiple fracture occurs although less marked than at the lower temperatures. In the third region, i.e. the ductile region, the material exhibits considerable ductility.
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