Abstract
An important preparatory work of the resin-injection repair process for carbon fibre reinforced polymer laminates, damaged by low-velocity impact, involves drilling vent holes (VHs) and resin-injection holes (RHs). This paper reports the effects of the holes on the laminate mechanical integrity, by comparing the results of pristine and damaged laminates containing one RH in the presence of 4 to 6 VHs. Laminates were damaged by a quasi-static indentation method, followed by drilling. The VH-associated structural damage factor, λ, yielded no significant difference between pristine and damaged laminates. However, the RH-associated λ of damaged laminates was significantly higher than pristine ones. In-plane compression testing revealed that holes in damaged laminates reduced the resilience, fracture toughness, fracture strength and strain to fracture but no appreciable trend was observed with increasing number of VHs. The study indicates that RH exerted a greater influence than VH on the degradation of the mechanical properties.
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