Determination of the influence of the machining parameters on the tensile load in CFRPs by analysis of variance

Abstract

By the increasing use of carbon fiber reinforced composites (CFRP) materials have started to increase the interest in CFRP materials. However, it also has cause problem of machining of CFRP. The most common method used in machining of CFRP is drilling. But some problems occur such as deformation, poor surface quality, and matrix burning in the drilling of CFRP. These problems cause the CFRP to be damaged more quickly or to become waste. In this study, the effects of drilling conditions of CFRP materials that have a 0/90° fiber orientation angle which subjected to tensile loads were investigated. At firstly, CFRP materials were drilled at spindle speeds of 1000, 3000 and 5000 rpm and feed rates of  0.05, 0.10 and 0.15 mm/rev with HSS, Wc and Brad Spurr tool types. Then, the variance analyses (ANOVA) was applied to determinate the rate of drilling parameters, tool type and material. effects on cutting force, deformation factor, surface roughness, and tensile load. As a result of the study, it was seen that the most effective parameter on cutting force, surface roughness, deformation, and the tensile load was tool type. However, it was also determined that the optimum parameters were WC tool type, the feed rate of 0.05 mm/rev and the spindle speed of 5000 rpm. In addition, the tensile load of CFRP was obtained 19% higher in optimum drilling parameters.

Keywords

• Analysis of Variance; CFRP; Cutting Force; Deformation Factor; Surface roughness; Tensile load.

KETP kompozitlerin delinmesinde delme parametrelerinin çekme kuvvetine etkisinin varyans analizi ile incelenmesi

Abstract

Karbon elyaf takviyeli plastik (KETP) kompozitlerin kullanım alanlarının artmasıyla birlikte araştırmacıların bu malzemelere olan ilgisi artmaya başlamıştır. Artan bu ilgi KETP kompozitlerin talaşlı işlenmesi problemini de beraberinde getirmiştir. KETP kompozitlerin talaşlı işlenmesinde kullanılan en yaygın işleme yöntemi delme işlemidir. Ancak KETP kompozitlerin delme işlemlerinde deformasyon, kötü yüzey kalitesi, matris yanması gibi bazı problemler meydana gelmektedir. Bu problemler KETP kompozitlerin daha çabuk hasara uğramasına ya da atıl duruma gelmesine neden olmaktadır. Bu çalışmada, 0/90 elyaf yönlendirme açısına sahip KETP kompozitlerin delinmesinde takım tipi, ilerleme oranı ve iş mili devri gibi delme parametrelerinin KETP kompozitlerin çekme kuvveti üzerine etkileri incelenmiştir. İlk aşamada KETP kompozitler; 140° uç açısına sahip WC (Sert Karbür), 118° uç açısına sahip HSS (Yüksek Hız Çeliği) ve Ağaç (Brad Spur) kesici takımlarıyla 1000, 3000 ve 5000 dev/dk iş mili devirlerinde ve 0.05, 0.10 ve 0.15 mm/dev ilerleme oranlarında delinmiştir. İkinci aşamada takım uç geometrisinin ve malzemesinin, ilerleme oranının ve iş mili devrinin; KETP kompozitlerin kesme kuvveti, deformasyon faktörü, yüzey pürüzlülüğü ve çekme kuvveti üzerine etkileri incelenmiştir. Bu etkileri sayısal olarak tanımlamak için de varyans (Anova) analizi yapılmıştır. Yapılan çalışma sonucunda, KETP kompozitlerin delinmesinde kesme kuvveti, yüzey pürüzlülüğü, deformasyon ve çekme kuvveti üzerinde en etkili parametrenin takım tipi olduğu görülmüştür. KETP kompozitlerin delinmesinde optimum parametrelerin WC takım tipi, 0.05 mm/dev ilerleme oranı ve 5000 dev/dk iş mili devri olduğu ve optimum delme parametrelerinde delinmesi durumunda çekme kuvvetinin %19 oranında daha yüksek elde edildiği tespit edilmiştir. 

Keywords

• Çekme Kuvveti,Deformasyon Faktörü,Kesme Kuvveti,KETP,Varyans Analizi,Yüzey Pürüzlülüğü

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