Abstract
Fatigue damage was sensed in real time in continuous carbon fiber and its polymer-matrix and carbon-matrix composites by electrical resistance measurement in the fiber direction. In a polymer-matrix composite, fiber breakage overshadows fiber damage in causing the resistivity of the composite to increase irreversibly. In a carbon-matrix composite, fiber breakage and matrix cracking caused the resistivity to increase irreversibly, such that these two mechanisms cannot be distinguished. Fatigue damage was detected from 50% of the fatigue life onward for the polymer-matrix composite, and from 0% of the fatigue life onward for the carbon-matrix composite.
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Wang, X., Wang, S. & Chung, D.D.L. Sensing damage in carbon fiber and its polymer-matrix and carbon-matrix composites by electrical resistance measurement. Journal of Materials Science 34, 2703–2713 (1999). https://doi.org/10.1023/A:1004629505992
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DOI: https://doi.org/10.1023/A:1004629505992