Mechanical Structure Investigations of Woven and Knitted Carbon Fiber- Reinforced Polymer Composites

Abstract

In this study, polymer matrices were reinforced with carbon fabric obtained by weaving and knitting carbon filaments. Different industries reported that filament unwinding occurred in woven carbon fiber composites. In composite manufacturing where woven fabric is required, the laying and manufacturing processes are challenging due to the dispersion of the fabric. With the knotted chain structure of the knit, it is easier to apply epoxy to the fabric as desired and to convert it into a composite. Especially when it is possible to produce the knit-ted chains tightly and as a whole during the knitting process, it is possible for the product converted into a composite to exhibit higher strength. In this study, the effects of weaving and knitting methods on the mechanical properties of carbon fiber reinforced composites were investigated. Mechanical properties were examined in woven and knitted structures for carbon fiber composite materials with different densities and thicknesses. Single-layer composite was produced using 3-layer 200 g/m2 plain woven fabric, 200 g/m2 and 245 g/m2 twill carbon fiber woven fabric as woven fabric. Carbon fabric with 1x1, 2x1, and 3x1 inter-lock knit structures were knitted so that it could be compared with weaving. The carbon fabrics obtained from woven and knitted filaments were turned into car-bon fiber-reinforced composites produced by vacuum infusion. Tensile and three-point bending tests of carbon fiber-reinforced composites were carried out within the scope of experimental studies. The fracture surfaces of the composite plates obtained were investigated via FESEM and EDS analyses. The highest ten-sile strength values were achieved in 245 g/ m2 twill weave and 3x1 interlock knitted carbon composite samples. In the knitted samples used, no dissolution problem was observed in the knitted structure.

Keywords

• fiber reinforced
• carbon fiber
• composite
• mechanical strength

Dokuma ve Örme Karbon Fiber Takviyeli Polimer Kompozitlerin Mekanik Yapı Araştırmaları

Abstract

Bu çalışmada, polimer matrisler, karbon filamentlerin dokunması ve örülmesiyle elde edilen karbon kumaş ile takviye edilmiştir. Farklı endüstriler, dokunmuş karbon fiber kompozitlerde filament açılmasının meydana geldiğini bildirmiştir. Dokuma kumaş kullanılması gereken kompozit imalatında serim ve imalat süreçleri kumaşın dağılmasından dolayı zorlayıcı olmaktadır. Örgünün sa-hip olduğu düğüm zincirli yapısı ile kumaşa istenilen şekilde epoksi uygulanması ve kompozite dönüştürülme süreci daha kolaydır. Özellikle örgü sürecinde örgü zincirlerinin sık ve bir bütün şekilde üretilmesi mümkün olduğunda kompozite dönüşen ürünün daha yüksek dayanım sergilemesi mümkün olabilir. Bu çalışma ile dokuma ve örme yöntemlerinin karbon fiber takviyeli kompozitlerin mekanik özellikleri üzerindeki etkisi araştırılmıştır. Yoğunluk ve kalınlıkları farklı olan karbon fiber kompozit malzemeler için dokuma ve örme yapılarda mekanik özellikler incelenmiştir. Dokuma kumaş olarak 3 katlı 200 g/m2 düz dokuma kumaş, 200 g/m2 ve 245 g/m2 dimi karbon fiber dokuma kumaş kullanılarak tek katlı kompozit üretilmiştir. Dokuma ile karşılaştırılabilmesi için 1x1, 2x1 ve 3x1 interlok örgü yapılarına sahip kar-bon kumaş örülmüştür. Dokuma ve örme filamentlerden elde edilen karbon ku-maşlar, vakum infüzyonla üretilen karbon fiber takviyeli kompozitlere dö-nüştürülmüştür. Deneysel çalışmalar kapsamında karbon fiber takviyeli kompozitlerin çekme ve üç noktalı eğme testleri gerçekleştirilmiştir. Kompozit plakaların kırılma yüzeyleri FESEM ve EDS analizleri ile incelenmiştir. En yüksek çekme mukavemeti değerleri 245 g/m2 dimi örgü ve 3x1 interlok örgülü karbon kompozit numunelerinde elde edilmiştir. Kullanılan örme numunelerde, örme yapısında çözülme problemi gözlenmemiştir.

Keywords

• Fiber takviye
• karbon fiber
• kompozit
• Mekanik dayanım

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