Load-Extension Curves and Fracture Toughness
The shape of the load-extension curve, observed when stretching an unnotched specimen at constant speed, provides an indication of the rate of hardening beyond yield. Evidence is provided that this rate has an important influence on propensity to craze, on the plastic-zone shape, and on the fracture toughness of notched specimens. This has relevance to the effects of chemical constitution, molecular orientation, molecular weight, and some additives.
KeywordsFracture Toughness Shear Band Plastic Zone Draw Ratio Ethylene Terephthalate
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