REINFORCING FIBER BASE MATERIAL, LAMINATE AND COMPOSITE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a reinforcing fiber base material giving a composite material having excellent thermal cycle durability, especially suppressing the generation of surface cracks after a thermal cycle test and further having excellent impregnation property in molding and to provide a preform and a composite material. SOLUTION: The reinforcing fiber base material includes at least a reinforcing fiber yarn group containing continuous reinforcing fiber yarns parallelly aligned in one direction and a warp direction auxiliary fiber yarn group composed of warp direction auxiliary fiber yarns extending in the direction parallel to the reinforcing fiber yarns, wherein the roundness of the single fiber of the reinforcing fiber yarn is 80-100% and the roundness of the single fiber of the warp direction auxiliary fiber yarn is 40-80%. COPYRIGHT: (C)2010,JPO&INPIT