Kesme gerilimi altında kalınlaşan sıvı emdirilmiş S2 cam fiber kumaşların düşük hız delinme dirençlerinin araştırılması

Abstract

Bu çalışmada literatürdeki çalışmalardan farklı olarak, yüksek mukavemete ve darbe dayanımına sahip S2 cam fiber kumaşlara kesme gerilimi altında kalınlaşan sıvı (shear thickening fluid: STF) emdirilerek düşük hız delme ve yarıstatik delme dirençleri belirlenmiştir. Bu amaçla ilk olarak, ağırlıkça %20 oranında silika içeren polietilen glikol 400 (PEG400: Moleküler ağırlığı 400 g/mol’dür.)/silika süspansiyonu hazırlanarak reolojik ölçümleri gerçekleştirilmiştir. Ardından, kuru ve STF emdirilmiş kumaşlara delici ucun 200 mm, 300 mm ve 400 mm yükseklikten bırakıldığı durum için ağırlık düşürme delme ve yarı statik delme (delme hızı 6 mm/dk.) testleri uygulanmıştır. Kumaşlarda oluşan hasarlar ve altlık malzemede oluşan deformasyon izleri detaylıca ele alınmıştır. Yapılan reolojik testler sonucunda ağırlıkça %20 oranında silika içeren PEG400/silika süspansiyonunun kesme kalınlaşması davranışı sergilediği görülmüştür. Kumaşlara STF emdirilmesiyle birlikte delici ucun sırasıyla 200 mm, 300 mm ve 400 mm yükseklikten bırakıldığı durum için delici ucun altlık malzemeye batma derinliğinde sırasıyla %30.7, %17.7 ve 20.7’lik bir azalma görülmüştür. Ayrıca, ağırlık artışı açısından STF emdirilmesinin kumaş tabakası sayısını arttırmaya göre daha makul sonuçlar verdiği görülmüştür. Yarı statik delme testleri sonucunda ise kuru ve STF emdirilmiş kumaşlar yakın karakteristik özellik göstermiştir.

Keywords

• Kesme kalınlaşması gösteren sıvı
• S2 cam fiber
• Reoloji
• Düşük hız delme

Investigation of the low velocity puncture resistance of shear thickening fluid impregnated S2 glass fiber fabrics

Abstract

In this study, unlike the studies available in the literature, low velocity puncture resistance and quasi-static puncture resistance of S2 glass fiber fabrics with high strength and impact resistance impregnated with shear thickening fluid (STF) was determined. For this purpose, firstly, a polyethylene glycol 400 (PEG400: 400 g/mole of molecular weight) suspension with the silica loading of 20 wt% was fabricated and then, rheological measurements were carried out. Then, drop weight puncture tests for the drop height of 200 mm, 300 mm and 400 mm and quasi-static puncture tests (6 mm/min of puncture velocity) were applied to neat and STF impregnated fabrics. Damages in fabrics and deformation marks on backing material were discussed in detail. As a result of the rheological tests, it was observed that the PEG400/silica suspension exhibits shear thickening behavior. With the STF impregnation, a decrease of 30.7%, 17.7% and 20.7% was observed in the penetration depth of the penetrator into the backing material for the drop height of 200 mm, 300 mm and 400 mm, respectively. In addition, It has been seen that the impregnation of STF gives more reasonable results in terms of weight increase than increasing the number of fabric layers. As a result of quasi-static puncture tests, neat and STF impregnated fabrics showed close characteristics.

Keywords

• Shear thickening fluid
• S2 glass fiber
• Rheology
• Low velocity puncture

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