Augmentation of the Delamination Factor in Drilling of Carbon Fibre-Reinforced Polymer Composites (CFRP).

Sharizal Ahmad Sobri,Azfi Zaidi Mohammad Sofi,Wan Omar Ali Saifuddin Wan Ismail,Mohd Natashah Norizan,Julie Juliewatty Mohamed,Mohd Sukhairi Mat Rasat,Mohd Hazim Mohamad Amini,David Whitehead,Andi Hermawan,Mazlan Mohamed

doi:10.3390/polym12112461

Abstract

Carbon fibre-reinforced polymer (CFRP) composite materials play an increasingly important role in modern manufacturing, and they are among the more prominent materials used in aircraft manufacturing today. However, CFRP is highly prone to delamination and other damage when drilled due to it being extremely strong with a good strength-to-weight ratio and high thermal conductivity. Because of this problem and CFRP’s growing importance in aircraft manufacture, research has focused on the entry and exit holes as indicators of damage occurrence during drilling of screws, rivets, and other types of holes. The inside of the hole was neglected in past research and a proper way to quantify the internal side of a hole by combining the entry and exit hole should be included. To fill this gap and improve the use of CFRP, this paper reports a novel technique to measure the holes by using the extension of the adjusted delamination factor (SFDSR) for drilling thick CFRP composites in order to establish the influence of machining input variables on key output measures, i.e., delamination and other damages. The experimental results showed a significant difference in interpretation of the damage during the analysis. Improvement was made by providing better perspectives of identifying hole defects.

Highlights

By relying on conventional materials, it is impossible to fulfil the requirements of a growing number of applications because the components required are becoming increasingly complex in Polymers 2020, 12, 2461; doi:10.3390/polym12112461 www.mdpi.com/journal/polymersPolymers 2020, 12, 2461 geometry and shape
The aim of this paper is to present a novel technique to measure proposed model is to be applied, and more research is required to resolve this fundamental the holes by using the extension of adjusted delamination factor (SFDSR ) for drilling thick Carbon fibre-reinforced polymer (CFRP)
The research work presented in this paper is concerned with the drilling of carbon fibre-reinforced

Summary

Introduction

By relying on conventional materials, it is impossible to fulfil the requirements of a growing number of applications because the components required are becoming increasingly complex in Polymers 2020, 12, 2461; doi:10.3390/polym12112461 www.mdpi.com/journal/polymersPolymers 2020, 12, 2461 geometry and shape. By relying on conventional materials, it is impossible to fulfil the requirements of a growing number of applications because the components required are becoming increasingly complex in Polymers 2020, 12, 2461; doi:10.3390/polym12112461 www.mdpi.com/journal/polymers. The size of components is tending towards two extremes, i.e., either to shrink (micro-parts for products such as optical devices and mobile phones) or to considerably grow in size (the Airbus A380 aircraft wing, for instance). Composite materials consist of two or more separate constituents or phases consisting of manufactured or natural materials. The physical or chemical properties of each material are significantly different and separate within the finished/combined structure. Composites are the most desired form of material in the industry and already obtain widespread adoption in building, furniture, packaging, flooring, panelling and the automotive industry [1,2,3,4]. In many high-tech industries, such as aerospace and defence, composites are frequently used [2]

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