Matrix effect on the static and dynamic interlaminar fracture toughness of glass-fibre marine composites

Abstract

The interlaminar fracture toughness of four marine composites has been investigated. The matrix material was different in each composite. Mode I and Mode II tests were performed under static loading and the focus was placed on the transfer of matrix toughness to the composite. A coefficient of toughness transfer was used to quantify the synergy experienced in the Mode I results. Mode II tests were also performed under dynamic loading with the focus placed on the order of results in relation to the order of matrix toughness. The study concludes that synergy in Mode I results for crack initiation and steady-state propagation is greatest in the composites with superior interfacial bonding. The Mode I results do not correspond directly to matrix toughness owing to interfacial strength limitations, relative to matrix strength, in the composites with the toughest matrices. A similar pattern is evident in the results for crack initiation in static mode II tests. At the maximum load point in static Mode II tests, where fast fracture occurred, and in dynamic Mode II tests, the results are consistent with the order of matrix toughness. For these results, differences in interfacial bonding seem to have an insignificant effect. Show more