Abstract
The present study concentrates on optimization and the effect of machining parameters on delamination that occurs during drilling operation of pure glass fiber-reinforced polymer (GFRP) composites and added GFRP composites which were developed for resistance to erosion wear. Contribution of drilling parameters to delamination was investigated by using Taguchi method and analysis of variance (ANOVA). Relationship between machining parameters and delamination was modelled by using response surface methodology. Correlations were established between the machining parameters by quadratic regression using response surface methodology (RSM). Delamination factors in the hole entrance and exit were obtained in drilling of pure glass fiber epoxy, and SiO2- and Al2O3-added GFRP materials using the experimental plan. Delamination factors at the hole exits were found bigger than delamination factors at the hole entrances. The smallest delamination values were obtained in GFRP/epoxy composite compared to Al2O3/SiO2-added GFRP composites at the hole exit. In the investigation of machinability of composites, considering the material as a variable, it has been determined that the material has a greater effect on delamination than the cutting parameters. A new machinability index defined and the material having the best machinability of the three materials was Al2O3-added GFRP composite at the entrance. Good machinability was obtained in drilling of pure GFRP/epoxy composite at the hole exit. It has been found that the effect of feed rate on delamination is greater than the cutting speed and the cutting speed has a low effect. Optimization of the multi-objective function created for maximizing the material removal rate, minimizing the delamination, was performed, and the optimum drilling parameters were obtained. As a result of the experimental study, it was found that the amount of delamination increased although the low mechanical property-added GFRP composites with the high resistance to erosion wear in accordance with pure epoxy GFRP composites due to the lack of a strong bond between the epoxy and the fibers in Al2O3 and SiO2. It was observed that the delamination amounts of pure epoxy GFRP, Al2O3-added GFRP, and SiO2-added GFRP composites increased respectively, while the compressive and tensile strengths of these three materials decreased.
Highlights
Fiber reinforced polymer composite materials offer superior properties such as high strengthto-weight ratio, stiffness-to-weight ratio, and good corrosion resistance, and they are preferred for high-performance applications in several industries such as in the aerospace, automotive, defense, and sport goods industries
The major objective of this study is to find out the factors affecting delamination and optimizing the processing parameters for minimum delamination [8]
Good machinability was obtained in drilling of pure glass fiber reinforced polymer (GFRP)/epoxy composite at the hole exit
Summary
Fiber reinforced polymer composite materials offer superior properties such as high strengthto-weight ratio, stiffness-to-weight ratio, and good corrosion resistance, and they are preferred for high-performance applications in several industries such as in the aerospace, automotive, defense, and sport goods industries. Due to this increase in the use of FRPCs(Fiber Reinforced Polymer Composites), studies on the machining of FRPCs have become increasingly important. The quality of the drilled hole is influenced adversely by matrix grid cratering, thermal damage, spalling, surface delamination, and material debasement or fiber pull-out. Defects such as fiber pull-out, matrix cratering, thermal damage and delamination effecting quality of hole occur by drilling
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