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

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.

Anahtar Kelimeler:

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

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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