Introduction

The expression composite repairs usually refers to one of three areas of extensive research activity: (1) repair of a damaged composite structure, (2) repair of aging (metallic) aircraft with composite patches, (3) and repair of civil engineering structures using composite reinforcement. Each one of those areas has received considerable attention. In this chapter we focus on the repair of impact-damaged composite structures.

Once damage is detected and the effects on the residual properties of the structure have been estimated, a decision must be made as to whether this composite part should be repaired or replaced. There are cases where damage cannot be repaired. For example, highly stressed members may not have sufficient strength after repair. Three types of repairs are possible:

1. Large damages that reduce the load-carrying capability of the component below the ultimate load must be repaired immediately. In time, temporary field repairs using bolted metal patches must be replaced by permanent shop repairs. Permanent repairs can be either bolted or bonded repairs with precured composite parts. Another option, called laminate repair or cocured repair, consists of simultaneously curing the reinforcing patches and the bonded joints.

2. Minor damages such that the part can sustain the ultimate load must be repaired within a defined period. Measures must be taken to prevent water and airstream ingress and to prevent damage propagation before the repair takes place.

3. […]