The Effect of Carbon Fibre Orientations and Core Thicknesses on Compression and Flexural Properties of Sandwich Composites

Year 2020, , 223 - 236, 03.06.2020

Serhat Osmanoğlu Erdem Selver Muharrem İmal

https://doi.org/10.36306/konjes.745739

Abstract

Sandwich composite structures are commonly used in different areas such as aerospace, marine, space, architectural structures where high strength and stiffness are required as well as the weight is a critical problem. Mechanical properties of the sandwich panels were affected by facesheets type, facesheet density and dimensions of the core materials. In this study, different thicknesses of PVC (polyvinyl chloride) foams were used as corepart of sandwich panels. PVC foam cores and sandwich composites with unidirectional and biaxial carbon fiber fabric face sheets were produced using vacuum infusion method and strength of the panels which have different fiber orientations were compared with 3-point bending and compression tests. Also, the effect of core thickness on core shear stress and flexural strength was investigated by using core materials of different thickness PVC foam. As a result, directions of fiber in facesheets was observed to be an important parameter in face strength. It was obtained that increasing the thickness of the core in the sandwich panels decreased the flexural and compressive strength of sandwich composites.

Keywords

Sandwich composites, PVC foam, Carbon fibre, Mechanical properties

SANDVİÇ KOMPOZİTLERDE ÇEKİRDEK KALINLIĞININ VE KARBON LİF YÖNLENMELERİNİN BASMA VE EĞİLME DAYANIMLARINA ETKİSİ

Abstract

Sandviç kompozit malzemelerin yüksek mukavemet ve rijitlik istenen, aynı zamanda ağırlığın problem olduğu havacılık endüstrisi, denizcilik endüstrisi, uzay ve mimari yapılar gibi alanlarda kullanımı yaygınlaşmıştır. Kompozit malzemelerde kullanılan yüzey plakaları, çekirdek malzemenin cinsi, yoğunluğu, boyutları malzemenin mekanik özelliklerini doğrudan etkilemektedir. Bu çalışmada kompozit sandviç panel malzemesinde çekirdek malzeme olarak farklı kalınlıkta PVC (PoliVinil Klorür) köpük kullanılmıştır. Vakum infüzyon yöntemiyle üretilen PVC köpüklü sandviç panellerin yüzey plakalarında tek yönlü ve çift eksenli karbon fiber kumaşlar kullanılmış, farklı fiber yönlenmelerine sahip panellere eğme ve basma deneyleri uygulanarak yüzey dayanımları karşılaştırılmıştır. Ayrıca, PVC köpükten farklı kalınlıkta çekirdek malzemeler kullanılarak çekirdek kalınlığının çekirdek kayma gerilmesi ve eğilme dayanımı üzerine etkisi araştırılmıştır. Sonuç olarak, panel plakalarında fiber yönlerinin yüzey mukavemetini etkileyen önemli bir parametre olduğu gözlemlenmiştir. PVC çekirdekli sandviç panellerde çekirdek kalınlığının artması sonucu basma ve eğilme dayanımının azaldığı ortaya çıkmıştır.

Keywords

Sandviç kompozitler, PVC köpük, Karbon lifi, Mekanik özellikler

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