Abstract
The development of microbuckling from a sharp notch under remote compressive loading is investigated for a unidirectional carbon-fibre/epoxy composite. Experimental measurements of the overall kink-band width confirm that a growing microbuckle propagates in a crack-like manner rather than like a dislocation. A large-scale bridging model with a crack tip toughness and a constant bridging stress is successful in correlating the length and width of a growing microbuckle with the remote stress. This R-curve behaviour is modelled using a finite element analysis. The effect of matrix yield strain on the R-curve is significant, while the influence of the matrix strain-hardening rate and initial fibre waviness is slight. Prediction of the initiation of microbuckling is found to be in good agreement with experimental data for a carbon-fibre/ epoxy composite.
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