초록 ▼

A fiber reinforced composite material comprising a resin matrix and primary reinforcement fibers and further comprising secondary, smaller diameter, reinforcement fibers at one or more ply interfaces, or portion thereof, provides improved interlaminar toughness, strength, and delamination resistance

A fiber reinforced composite material comprising a resin matrix and primary reinforcement fibers and further comprising secondary, smaller diameter, reinforcement fibers at one or more ply interfaces, or portion thereof, provides improved interlaminar toughness, strength, and delamination resistance without substantial reduction of in-plane properties and without substantial increase in weight. In one embodiment, the small fibers are attached to one side of a conventional prepreg prior to lamination. The small fibers are flexible and are expected to conform to the shape and distribution of the primary reinforcing fibers at the interface.

대표청구항 ▼

[ What is claimed is:] [1.]1. A laminate comprising a plurality of stacked layers, said layers forming an interface between each pair of adjacent layers, said layers comprising a matrix material and primary reinforcing fibers, and said laminate further comprising secondary reinforcing fibers present

[ What is claimed is:] [1.]1. A laminate comprising a plurality of stacked layers, said layers forming an interface between each pair of adjacent layers, said layers comprising a matrix material and primary reinforcing fibers, and said laminate further comprising secondary reinforcing fibers present in at least one interface, or one or more portions of said at least one interface, wherein said secondary fibers are smaller in diameter than said primary reinforcing fibers, and wherein the presence of said secondary reinforcing fibers do not substantially add to the thickness of said laminate, said secondary reinforcing fibers having a diameter less than 4000 nanometers and at least 3 nanometers.