Nearly Isotropic Resin-Transfer-Molded Composites

Nearly isotropic matrix/fiber composite materials can be made quickly and at relatively low cost by resin-transfer molding. The fiber components of these materials are fine, loosely woven, three-dimensional preforms; the matrix components are epoxy or polycyanate resins. With proper tooling, these materials can be resin-transfer molded to net shape. Alternatively, they can be machined to net shape. The three-dimensional weaves enable the materials to withstand machining with minimal loss of mechanical properties. These materials are particularly suitable for lightweight, all-composite replacements for aluminum end fittings that have been used on tubular composite-material structural members.