Publication Date: 2003-Aug-13
The IP.com Prior Art Database
The use of composite materials is continually increasing in both aerospace and commercial applications in the field of reinforced thermosetting composites. Techniques have been and are being developed to particularly improve impact resistance of cured parts. These toughening methods are used in a variety of composite materials and processes.
The use of composite materials is continually increasing in both aerospace and commercial applications. In the field of reinforced thermosetting composites. Techniques have been and are being developed to particularly improve the impact resistance of cured parts. These toughening methods are used in a variety of composite materials and processes.
Composite materials are widely used in applications where high strength and lightweight properties are required. Composite materials generally include one or more layers of fibers that are embedded in a resin matrix. They are generally based on the use of carbon or glass fibers in combination with thermosetting polymer resins. These materials are especially well suited for use in aircraft, marine and automotive components where high strength and lightweight are particularly desirable.
The composites industry has developed a variety of methods to produce reinforced, cured composite structures. The use of vacuum bag, autoclave or press molding processes have traditionally been the more common methods to apply the required heat and pressure to a composite to effect the curing of a thermosetting matrix resin.
The improvement of toughness of composite parts has become an important research objective in thermoset polymer composite science. The toughness improvement of epoxy/carbon composites for example, has been carried out by various methods such a matrix toughening, interface control, fiber coatings, hybrid fabrics comprising reinforcement and thermoplastic yarns in the weft and or warp direction and commingling of reinforcement and thermoplastic yarns into a unitary weavable yarn. The thermoplastic yarn may be selected in order to be either soluble or insoluble in the matrix resin during the curing process.
Another approach is the use of thermoplastic overlays or interleaves in laminate processing. This method of toughening has application...