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3 August 2001 Effect of matrix toughness on fatigue life of plain woven carbon fabric composites
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The effect of matrix toughness on the fatigue life of polymer matrix composites using plain woven carbon fabrics (pw-CFC) was studied. In order to vary the matrix toughness without changing the inherent cohesion properties such as adhesive strength between matrix and fibers, two different curing agents (acid anhydride and amine types) were used. Static tensile and tension/tension fatigue cyclic loads were applied to pw-CFC specimens. It was observed that the fatigue life was significantly affected by matrix toughness. During the fatigue tests, damage progression was observed intermittently by using a thermo-elastic stress analyzer (TSA). The stress re-distribution occurs due to fatigue damage progression. TSA can identify such stress re- distribution by means of detecting surface temperature amplitude. Highly fatigue-damaged area of pw-CFC was localized if the matrix toughness was high, although moderately damaged area grew all over the specimen. The experimental results indicate that the fatigue life and damage of pw-CFC are strongly governed by matrix toughness.
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Yasuhiro Nishikawa, Kazuya Okubo, Toru Fujii, and Toshiyuki Uenoya "Effect of matrix toughness on fatigue life of plain woven carbon fabric composites", Proc. SPIE 4336, Nondestructive Evaluation of Materials and Composites V, (3 August 2001);

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