Abstract
The effects of water absorption and desorption on fracture mechanisms of two typical materials, a short carbon fiber reinforced material and a chopped strand reinforced material with nylon matrices, were examined by AE monitoring and SEM. It was found that the matrix became brittle in vacuum-dry specimens, but became ductile in the water-absorbed specimens. These gave rise to different fracture behaviors of the materials used. In the short carbon fiber reinforced material, the matrix fracture and fiber breakage were main fracture forms in the vacuum-dry specimens, while the pull-out became the main fracture form in water absorbed specimens and those subjected to general air conditions. In the chopped strand reinforced material, the cracking between chopped tapes, and debonding of fiber/matrix in a chopped tape became marked as the moisture content of specimens increased. Especially in the water absorbed specimen, the matrix became more ductile, resulting in a large decrease of the interfacial strength, then leading to easy pull-out of fiber strands and chopped tapes.
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