Micromechanisms of Fracture of Fibrous Composites in Monotonic Loading

摘要

Carbon fibers and glass fibers in brittle matrics fracture by a number of distinguishable mechanisms, matrix cracking, failure of the fiber-matrix bond, fiber fracture, fiber pull-out, and so forth. A large amount of data of fiber debond length and fiber pull-out length have been collected and summarized in cumulative probability diagrams which show the distribution of extreme values. Models of fracture, together with the fracture data are used to construct fracture energy diagrams which show the origins of toughness and the dominate mechanism of failure. Failure analyses have been carried out on glass fibers and carbon fibers in epoxy and polyester resins, and on hybrid composites. Certain generalisations about fracture behavior can be drawn from comparisons of the cumulative probability and fracture energy diagrams. (Author)