Sensing damage in carbon fiber and its polymer-matrix and carbon-matrix composites by electrical resistance measurement |
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Authors: | Xiaojun Wang Shoukai Wang D D L Chung |
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Affiliation: | (1) Composite Materials Research Laboratory, State University of New York at Buffalo, Buffalo, NY, 14260-4400 |
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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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