Abstract
In manufacturing large-scale composite structure by means of vacuum assisted resin transfer molding (VARTM), the design of “process properties”, such as location of resin inlet and vacuum vent, is very important to prevent occurrence of dry-spot. If dry-spot occurred, then such defectives are normally destroyed. However, is it really impossible to reuse products with dry-spot? In this study, the interfacial bonding performance between undercured FRP and uncured resin was evaluated by lap-shear strength tests, which simulate the “reinjection” of matrix resin into dry-spot in fiber reinforced plastic (FRP) molded by VARTM. As a result, curing reaction was indicated in the interface between under-cured FRP and uncured resin. On the other hand, delamination was observed at the interface between after-cured FRP and uncured resin.
