Injection repair for restoration of composite properties

Abstract

Resin injection is a less intrusive method of repair and does not require near the post processing of other composite repair methods. However, until recently this method of repair has not allowed the restoration of the structural properties. Through the development of a new resin system combined with a novel injection repair process, it is shown that it is possible to effectively restore the properties of advanced composite materials. Resin injection repairs offer a low invasive repair method that can restore and maintain the structural integrity of structural members subjected to manufacturing flaws or operational damages. The repair effectiveness was previously demonstrated in open hole and edge delaminated composites. In this work, the use of injection repair is now further shown to be able to restore bearing strength on delaminated fastener holes. Mechanical tests were performed to investigate the environmental effects as well as residual strength after fatigue loading.