This article reviews various rapid prototyping (RP) processes, such as stereolithography, powder sintering, hot melt extrusion, sheet lamination, solid ground curing, and three-dimensional printing. It discusses various material prototypes produced by RP technology. The list of materials includes particulate and fiber-reinforced polymer, ceramic-matrix composites, and metal-matrix composites. The article provides information on freeform-fabrication techniques for composite part lay-up.
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