RTM ile üretilen iki-yönlü cam-dokuma takviyeli kompozit levhalarda cam-keçe kullanımının mekanik anizotropi üzerine etkisi

Year 2017, Volume: 23 Issue: 8, 967 - 973, 28.12.2017

Raif Sakin

Abstract

Bu
çalışmada, Reçine Transfer Kalıplama (RTM) ile imal edilen iki-yönlü cam-dokuma
takviyeli kompozit levhalarda cam-keçe kullanımının mekanik anizotropi üzerine
etkisi araştırılmıştır. Bu amaçla, bilgisayar kontrollü laboratuvar ölçekli
Reçine Transfer Kalıplama (RTM) prosesi kurulmuştur. Ayrıca, tam kapalı, vakum
destekli ve ısı kontrollü olarak tasarlanan RTM kalıbının alt ve üst
yüzeylerinde parlatılmış paslanmaz çelik saclar kullanılarak iki yüzü düzgün
kompozit levhalar üretilmiştir. Çalışmada RTM’ye uygun Polipol-336 polyester reçinesi
kullanılmıştır. Kompozit levha imalatı için 800-500-300-200 g/m² 'lik iki-yönlü
cam-dokumalar arasına 450-225 g/m² 'lik cam-keçeler yerleştirilmiştir. RTM
prosesi sonunda kalıptan %38,1 - %48,0 fiber hacimli, 6-15 tabakalık farklı
kombinasyonlarda ve yaklaşık 3 mm kalınlığında kompozit levhalar elde
edilmiştir. Bu kompozit levhaların çekme ve eğilme mukavemeti gibi temel
mekanik özellikleri test edilmiştir. Deneyler sonucunda, özellikle depolama
tankları, deniz araçları ve yapı endüstrisi gibi sektörlerde kullanılan büyük
ölçekli tabakalı kompozit levhalarda cam-dokumalar arasına cam-keçe
takviyesinin mekanik anizotropi üzerinde olumlu etkisi olduğu tespit
edilmiştir. Ayrıca maliyet açısından da değerlendirme yapılmış ve optimum
kompozit levha maliyeti için önerilerde bulunulmuştur.

Keywords

İki-yönlü, Cam-dokuma, Rasgele Cam-keçe, Mekanik anizotropi, Kompozit levha, RTM metodu

Effects of glass-mat on mechanical anisotropy in bidirectional e-glass woven roving reinforced composite sheets produced by RTM method

Abstract

In
this study, it was investigated that the effects of glass-mat on mechanical
anisotropy in bidirectional e-glass woven roving reinforced composite sheets
produced by RTM method. Resin Transfer Molding (RTM) process with a
computer-controlled laboratory-scale was established for this purpose. In
addition, the RTM mold was designed as fully closed, a temperature-controlled
and the vacuum-assisted. Two sides smooth plates were manufactured utilizing
polished stainless steel plates on the top and bottom surfaces of the RTM mold.
The resin suitable to RTM is unsaturated polyester called Polipol-336. To
obtain composite sheets, the glass-mats with areal weights of 450 and 225 g/m²
were placed between the glass-woven rovings with areal weights of
800-500-300-200 g/m². At the end of the RTM process, it was obtained composite
sheets which have different combinations of fabrics with 6-15 plies and
approximately 3mm sheet thickness at a fiber volume fraction of 38,1% - 48,0%.
Then, basic mechanical properties such as tensile and flexural strength of the
composite sheets was tested. As a result of tests, the glass-mats placed
between the glass-woven rovings provided a very positive effect on the
mechanical anisotropy. Particularly, this positive effect is very important in
the industries such as storage tanks, marines and the building constructions
used large-scale laminated composite sheets. Also an assessment made on the
cost and it was made recommendations for optimal cost of composite laminates.

Keywords

Bidirectional glass-woven roving, Glass-mat, Mechanical anisotropy, Composite sheet, RTM method

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