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Fiber breakage in polymer-matrix composite during static and fatigue loading, observed by electrical resistance measurement

Published online by Cambridge University Press:  31 January 2011

Xiaojun Wang  and
D. D. L. Chung
Xiaojun Wang
Affiliation:
Composite Materials Research Laboratory, State University of New York at Buffalo, Buffalo, NY 14260–4400
D. D. L. Chung
Affiliation:
Composite Materials Research Laboratory, State University of New York at Buffalo, Buffalo, NY 14260–4400
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Abstract

By measuring the electrical resistance of a continuous unidirectional carbon fiber epoxy-matrix composite along the fiber direction during loading in this direction, fiber breakage was progressively monitored in real time. Fiber breakage occurred in spurts involving 1000 or more fibers. It started at about half of the failure strain during static tensile loading and at about half of the fatigue life during tension–tension fatigue testing. Immediately before static failure, at least 35% of the fibers were broken. Immediately before fatigue failure, at least 18% of the fibers were broken. The fiber breakage was accompanied by decrease in modulus.

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Type
Articles
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Journal of Materials Research , Volume 14 , Issue 11 , November 1999 , pp. 4224 - 4229
Copyright
Copyright © Materials Research Society 1999

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