炭素繊維強化熱可塑性樹脂積層板におけるモードI層間はく離破壊靱性

概要

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Delamination fracture toughness and fracture mechanism in carbon fiber reinforced Nylon laminates have been investigated. The mode I interlaminar fracture toughness tests are carried out on double cantilever beam (DCB) specimens made from four kinds of angle-ply laminates. These laminates exhibit the unstable "stick-slip" behavior on the crack propagation. In order to obtain the continuous G_I-R curve describing the stick-slip behavior, one modification is made to Kageyama's modified compliance method. From the continuous G_I-R curves, it is found that the stable delamination is characterized by a flat region of G_<Istable> ≈ 1200 J/m^2 for all lay-ups except for a 60°//-60°specimen which shows the rising G_I-R curve to final failure. The interlaminar fracture toughness of these composite laminates is considerably higher than that of carbon/epoxy laminates. Based on the continuous G_I-R curves and the observation of the fracture surfaces, a mechanism is proposed in which the unstable stick-slip behavior is explained by the development of the large-scale bridging of the fiber bundle or layer and its breakage.
社団法人日本機械学会の論文
1995-06-25