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Mechanical properties of low-velocity impact damaged carbon fibre reinforced polymer laminates: effects of drilling holes for resin-injection repair

Lookup NU author(s): Wei Liang Lai, Dr Hamid Saeedipour, Dr Kheng-Lim GohORCiD



This is the authors' accepted manuscript of an article that has been published in its final definitive form by Elsevier Ltd, 2020.

For re-use rights please refer to the publisher's terms and conditions.


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, , yielded no significant difference between pristine and damaged laminates. However, the RH-associated  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.

Publication metadata

Author(s): Lai WL, Saeedipour H, Goh KL

Publication type: Article

Publication status: Published

Journal: Composite Structures

Year: 2020

Volume: 235

Print publication date: 01/03/2020

Online publication date: 12/12/2019

Acceptance date: 10/12/2019

Date deposited: 19/12/2019

ISSN (print): 0263-8223

ISSN (electronic): 1879-1085

Publisher: Elsevier Ltd


DOI: 10.1016/j.compstruct.2019.111806


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