Analysis of Delamination Factor in the Drilling of Sandwich Composites

Yıl 2017, Cilt: 22 Sayı: 3, 153 - 162, 28.12.2017

Abdil Kuş Ergün Ekici

https://doi.org/10.17482/uumfd.372451

Cited By: 2

Öz

In this study the delamination factor forming on the
in and out areas of the hole in drilling of sandwich composites fabricated by using
different core materials with honeycomb geometry was analyzed. Cutting speed,
feed rate, and core material type were taken as the controlling factors in the
experiments carried out according to Taguchi method L18 design. The experiments
were carried out on a CNC vertical machining center using TiAlN coated carbide
drill with a diameter of 6,3 mm. Moreover, an analysis of variance (ANOVA) with
a 95% confidence level was applied and the optimal parameters for the damages
on the in and out areas were determined. Optical images of the holes were taken
in all test conditions after the drilling of every two specimens, and the
damage types forming on the out area of the hole were analyzed for the optimal
cutting parameters.The most effective parameter on the delamination factor was
the cutting rate with a contribution rate of 46% for the hole entrance zone and
the feed rate with the contribution rate of 32.8% for the exit zone. In
particular, the types of damage that occurred in the hole exit zone were found
delamination, uncut fibers, and cracking. 

Anahtar Kelimeler

Sandwich composite, Delamination factor, Nomex, Taguchi method, Drilling

SANDVİÇ KOMPOZİTLERİN DELİNMESİNDE DELAMİNASYON FAKTÖRÜNÜN İNCELENMESİ

Öz

Bu
çalışmada bal peteği geometrisinde farklı çekirdek malzemelerden üretilen
sandviç kompozitlerin delinmesinde delik giriş ve çıkış bölgesinde oluşan
delaminasyon faktörü araştırılmıştır. Taguchi metodu L₁₈ tasarımına
göre yapılan deneylerde kontrol faktörleri olarak kesme hızı, ilerleme miktarı
ve çekirdek malzeme tipi esas alınmıştır. Deneyler CNC dik işleme merkezinde 6,3
mm çapında TiAlN kaplı karbür matkap kullanılarak gerçekleştirilmiştir. Ayrıca
%95 güven seviyesinde varyans analizi (ANOVA) uygulanmış, giriş ve çıkış
bölgeleri hasarı için optimum parametreler belirlenmiştir. Her iki numunede
delme işlemi sonrasında tüm deney şartlarında deliklerin optik görüntüleri
alınmış ve en yüksek kesme parametreleri için delik çıkış bölgesinde oluşan
hasar tipleri incelenmiştir. Delaminasyon faktörü üzerinde en etkili parametre
delik giriş bölgesi için %46 katkı oranı ile kesme hızı,  çıkış bölgesi içinse %32,8 katkı oranı ile
ilerleme miktarı olmuştur. Özellikle delik çıkış bölgesinde oluşan hasar
tipleri delaminasyon, kesilmemiş elyaf ve parçalanma olduğu görülmüştür.

Anahtar Kelimeler

Sandviç kompozit, Delaminasyon faktörü, Nomex, Taguchi metodu, Delik delme

Kaynakça

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