Abstract
Abstract A study has been made by tensile testing to clarify the effects of notch length, temperature, environment, and blowup ratio on the local yielding criterion in polytylene, and also to investigate the fracture criterion. Double-edgenotched (DEN) speicimens of blown high-density polyethylene film were tested at several temperatures mainly in proply alcohol. As a result of testing, it was found that the general or local yield strength of transverse specimens was higher than that of longitudinal ones. By photographic examination during stretching, the local yielding zone size ahead of crack tip, crack opening displacement (COD), and crack length were observed. The growth rate of the local yielding zone increased with increasing strain, but it stopped abrutptly at or near a peak of stress-strain curve. With this relation and assuming an elastoplatic crack with a plastic zone, the modified Westergaard's equation could satisfactorily be applied to estimate the critical stress for local yielding. Using th...
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