Investigation of creep phenomena in polyethylene and polypropylene.
Edgemond, John W.
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Although creep in thermoplastics has been investigated thoroughly, especially polyethylene, not too much information exists to establish activation energies at different stress levels by the application of high stress level, short time creep tests. Extrapolation of data to zero stress levels gives a true material activation energy which is a measure of internal resistance to deformation. Description of specific creep parameters and equipment with a relatively simple phototube recording device are offered along with a discussion of results and recommendations for future fields of investigation.
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