Effect of Fiber Orientation on the Mechanical Properties of Glass Fiber Reinforced Polymer (GFRP)/PVC Sandwich Composites

Yıl 2023, Cilt: 13 Sayı: 1, 52 - 61, 30.06.2023

Bahar Baştürk

Öz

In this study, laminated sandwich composites consist of glass fiber reinforced polymer (GFRP) face-sheets (skins) and polyvinyl chloride (PVC) foam were bonded together via conventional hand lay-up method. The effect of fiber orientation (0/90 or +45/-45) was examined in terms of compression and flexural properties. Flatwise (FW) compressive test provided the core dominated properties and only 0/90 fiber-oriented samples were tested. When the average edgewise (EW) compressive strength of (0/90)GFRP/PVC and (+45/-45)GFRP/PVC sandwich composites were compared, both of them showed similar results. Core crushing, local bending, debonding and core shear were observed as the common failure modes in the sandwich structures under bending. In terms flexural response, the 0/90 fiber oriented GFRP skin slightly showed better strength values as compared with +45/-45 fiber-oriented structures. By considering the all-quasi-static tests, it can be concluded that 0/90 and +45/-45 fiber oriented GFRP skins exhibited similar performance and there was no significant superiority for any of them.

Anahtar Kelimeler

Sandwich composite, Flatwise test, Edgewise test, Flexural test, Failure modes

Teşekkür

The author specially thanks to METYX company and Mrs. Bikem Direkçi for providing PVC foam core.

Elyaf Yöneliminin Cam Elyaf Takviyeli Polimer (CETP)/PVC Sandviç Kompozitlerin Mekanik Özellikleri Üzerine Etkisi

Öz

Bu çalışmada, cam elyaf takviyeli polimer (CETP) yüzey tabakaları ve polivinil klorür (PVC) köpükten oluşan lamine sandviç kompozitler, geleneksel el yatırma yöntemi ile üretilmiştir. Fiber oryantasyonunun (0/90 veya +45/-45) etkisi, basma ve eğme özellikleri açısından incelenmiştir. Düzlemsel (yüzey-FW) basma testi, çekirdek (ara tabaka) özelliklerini domine ettiği için sadece 0/90 fiber yönelimli numuneler test edilmiştir. (0/90)CETP/PVC ve (+45/-45)CETP/PVC sandviç kompozitlerin ortalama yanal (EW) basma dayanımları karşılaştırıldığında, her ikisi de çok benzer sonuçlar göstermiştir. Sandviç yapılarda eğme yükü altında ortak çökme/kırılma tipleri olarak köpük ezilmesi, lokal eğilme, sandviç bileşenlerinin ayrışması ve çekirdek yapının kaymaya uğraması gözlenmiştir. Eğme davranışı açısından, 0/90 fiber yönelimli GFRP yüzey plaka, +45/-45 fiber yönelimli yapılara kıyasla az da olsa daha iyi mukavemet göstermiştir. Tüm statik testler göz önüne alındığında, 0/90 ve +45/-45 fiber yönelimli CETP yüzey plakalarının benzer performans sergiledikleri ve hiçbirinde belirgin bir üstünlük olmadığı sonucuna varılabilir.

Anahtar Kelimeler

Sandviç kompozit, Düzlemsel (Yüzey) basma testi, Yanal basma testi, Eğme testi, Kırılma tipleri

Kaynakça

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