To provide a method for stably manufacturing an FRP member without impairing the appearance such as a sink mark and being rich in a resin caused by dimensional variation of a core due to pressure of the injected resin, an increase in weight caused by penetration of the matrix resin into the core, and decrease in strength caused by interfacial releasing, when the FRP member with a wing shape of a hollow structure is prepared using a preform in which a reinforcing fiber base material is wound on the core in the wing chord length direction of the core by RTM (Resin Transfer Molding).
When the preform in which the reinforcing fiber base material is wound on the core with the wing-shaped hollow structure having a straight line part on at least one part of the cross-section in the wing chord length direction of the core, is prepared, the preform in which the wound tensile force is controlled so as to satisfy both an equation (1): 100*{X-(Y+Z)}=A (A≤0) and an equation (2): 0.3≤|A|<0.7 (wherein X: the dimension of the wing chord length after the reinforcing fiber is wound, Y: the thickness of the wound reinforcing fiber base material, and Z: the dimension of the wing chord length of the core single body), is prepared, and while an inner pressure is given to the preform, the RTM molding is performed.
| JPS6120731 | TUBULAR MOLDED BODY |
| JP2011140226 | CONTROLLED ATMOSPHERIC PRESSURE RESIN INFUSION PROCESS |
| WO/1989/002943 | PEEL PLY MATERIAL |
YOSHIYAMA TAKASHI
KAWASHIMA SHIGERU
TAKEMOTO HIDEHIRO
