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A Model for the Failure Process of Semicrystalline Polymer Materials under Static Fatigue

Published online by Cambridge University Press:  27 July 2009

Howard M. Taylor
Howard M. Taylor
Affiliation:
Department of Mathematical SciencesUniversity of Delaware Newark, Delaware 19716
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Extract

A semicrystalline polymer fiber is a composite material consisting of difficult-to-deform crystals joined by more easily deformed and more easily broken amorphous materials. The failure process begins at the atomic level in the amorphous regions where random thermal fluctuations cause, at some time, a molecule to slip relative to other molecules or to rupture at one of its atomic bonds. The frequency of such random events is greatly enhanced by small increases in stress. As molecules slip or rupture, neighboring molecules become overloaded, thus increasing their failure rates. Such molecule failures accumulate locally and give rise to growing microcracks, although the exact kinetic mechanisms are not well understood. These growing minute cracks are the irreversible changes in the microstructure of the material that ultimately lead to macroscopic failure of the fiber.

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Articles
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Probability in the Engineering and Informational Sciences , Volume 1 , Issue 2 , April 1987 , pp. 133 - 162
Copyright
Copyright © Cambridge University Press 1987

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