Person: KENTLİ, AYKUT
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KENTLİ
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AYKUT
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Publication Metadata only Comparative assessment of support plates' influences on delamination damage in micro-drilling of CFRP laminates(ELSEVIER SCI LTD, 2017) KENTLİ, AYKUT; Dogrusadik, A.; Kentli, A.In this study, drilling induced delamination damage which occurs during micro-drilling of CFRP laminates was investigated experimentally under variable cutting speeds and feed rates. Unlike the previous studies, the delamination factors in micro-drilling of CFRP laminates were precisely calculated and compared for supported and unsupported cases. Using support plates which are placed front and rear sides of the CFRP laminate is one of the methods which limits the delamination damage. Two different setups of support plates were used in the experiments. In the first setup, the entry board was aluminum plate and the backing board was phenolic plate. In the second setup, the entry board was brass plate and the backing board was wooden plate. Hole pictures were taken from each CFRP laminate by using a digital microscope. The first, the middle and the last three holes were inspected from the front and rear sides of the CFRP laminate. Minitab was used to evaluate the experiments' outputs, and response surface method was used to optimize the process parameters. It has been revealed that the delamination damage in micro-drilling differs from the delamination damage in conventional drilling of CFRP laminates. Obviously, the process exhibits unusual delamination behavior as process size decreases. (C) 2017 Elsevier Ltd. All rights reserved.Publication Metadata only Effect of support plates on the micro-drilled hole form quality in CFRP laminates(WALTER DE GRUYTER GMBH, 2019) KENTLİ, AYKUT; Dogrusadik, Ahmet; Kentli, AykutHole diameter, roundness error, and fiber overlap determine the form quality of a drilled hole on a fiber reinforced composite material. Using support plates is one of the methods to ensure hole form quality. In this study, the effects of support plates on hole form quality in the micro-drilling of CFRP laminates have been investigated. A comprehensive experimental study was carried out under variable cutting speeds and feeds. Three different setups were employed to inspect the effects of the support plates. In the first setup, bare CFRP laminates were drilled. In the second setup, aluminum entry board and phenolic backing board were used. In the third setup, brass entry board and wooden backing board were preferred to inspect the effect of different support plate materials. A large number of holes was drilled per experiment to be able to identify the tool wear effect on the process outputs. Diameter, roundness error, and fiber overlap were measured by using the hole images. Finally, variations of diameter, roundness error, and fiber overlap were evaluated for each setup. It was concluded that support plates improved the process outputs and made the process less sensitive to a change of process variables and tool wear.Publication Metadata only Experimental investigation of support plates' influences on tool wear in micro-drilling of CFRP laminates(ELSEVIER SCI LTD, 2019) KENTLİ, AYKUT; Dogrusadik, Ahmet; Kentli, AykutDrilling induced delamination and tool wear are two major problems in micro-drilling of CFRP laminates. Delamination is concerning the strength of the structure and must be avoided. One of the methods which is used as a preventive measure is utilization of the support plates. In this study, wear of the micro drill was investigated by taken into account the effects of support plates. Experiments with three levels of the spindle speed and feed were performed to provide the comparison between the supported and unsupported cases. Flank wear areas of the worn micro drills were used for the evaluation. It was revealed that feed was more effective on flank wear than spindle speed for both unsupported and supported cases, materials of the support plates had an influence on the flank wear, and cutting parameters were more effective on flank wear for the supported cases.