Delamination evaluation in drilling of composite materials – A review

Abstract

The persisting challenge for adaptable composite material, to make a remarkable material property along with lighter and stiffer parts. This leads to a wider application of composite materials (CFRPs and GFRPs) due to its better adaptability and predominant properties. Mechanical drilling is inevitable mode of operation and it’s always challenging and difficult for CFRP which leads to various onset damages. Drilling originated delamination at entry and exit of hole is most undesirable and defying damage leads to material rejection. Delamination assessment is always important for correction and improvement of assemble parts to achieve highest performance index. During last few decades, various delamination factors have been derived and suggested as a point of reference for delamination measurement and meanwhile various delamination assessment techniques are being proposed to measure the severity of delaminated zone for evaluation of delamination. This state-of-art review paper summarizes various delamination quantification and measurement techniques for the correction and improvement of drilling approach reported in open literature. It can be referenced not only as an up-to date summary available form past results but also possibilities for future scope to subdue delamination during drilling in CFRP.