EXPLORING THE EFFECTS OF STITCHING PROCESS ON THE MECHANICAL PROPERTIES OF THREE- DIMENSIONAL (3D) STITCHED UNIDIRECTIONAL COMPOSITES

Öz

The stitching process has obvious effects on the out- of- plane mechanical properties of composites such as impact damage mechanism or impact energy absorption. However, the effects on the in- plane mechanical properties of composites have been under discussion and need to be clarified. In the previous studies, tensile, shear and bending behaviors of 3D stitched biaxial woven carbon composite were investigated. The unidirectional carbon woven fabrics constitute the significant part of raw materials in the composite industry. For this reason, the research study was expanded to examine the in- plane mechanics of 3D stitched unidirectional carbon woven composites. In this study, the unstitched and 3D stitched unidirectional woven carbon composites were manufactured and tested under the shear, tensile and bending loads. While the stitching process improved the tensile and shear modulus of composite, it could not create the significant difference in the bending behavior. The highest module and maximum stress values were obtained in the tensile test. The bending and shear test results follow them, respectively. Moreover, it was proven that the fabric architecture of stitched composite layer has the substantial effect on the tensile properties of 3D stitched composite.

Anahtar Kelimeler

• Stitching
• Unidirectional Fabric
• Carbon Fiber
• Mechanical Tests
• Polymer Composites

DİKİM İŞLEMİNİN ÜÇ BOYUTLU (3B), DİKİLMİŞ TEK EKSENLİ KOMPOZİTLERİN MEKANİK ÖZELLİKLERİNE ETKİLERİNİN İNCELENMESİ

Öz

Dikme işlemi kompozitin kalınlığı yönündeki darbe hasar dayanımı ya da darbe enerjisi emilimi gibi mekanik özellikleri üzerine belirlenmiş etkilere sahiptir. Bu duruma karşın dikme işleminin kompozitin düzlemi yönündeki mekanik özellikleri üzerine etkileri hala tartışılmakta ve aydınlatılması ihtiyacı duyulmaktadır. Önceki dönemlerde yapılan çalışmalarda iki eksenli karbon dokuma kumaşların dikilmesi ile üretilmiş 3B kompozitin çekme, düzlemsel kayma ve eğilme özellikleri incelenmiştir. Tek eksenli karbon dokuma kumaşlar kompozit endüstrisinde kullanılan ham maddelerin önemli bir bölümünü temsil etmektedir. Tek eksenli karbon dokuma kumaşların dikilmesi ile üretilmiş olan 3B kompozitin düzlemsel mekanik özelliklerinin incelenmesi amacı ile çalışma genişletilmiştir. Bu çalışmada, tek eksenli karbon dokuma kumaşlar ile dikilmiş ve dikilmemiş kompozitler üretilmiş ve çekme, düzlemsel kayma ve eğilme yükleri altında test edilmişlerdir. Dikme işlemi kompozitin çekme ve düzlemsel kayma modüllerini arttırırken eğilme davranışında önemli bir fark yaratamamıştır. En yüksek modül ve yük değerleri çekme testinde elde edilmiştir. Eğilme ve kayma test sonuçları sırası ile bu değerleri takip etmiştir. Bu sonucun yanı sıra dikilmiş kompozit katmanının sahip olduğu kumaş mimarisinin kompozit çekme özellikleri üzerine önemli bir etkisinin olduğu belirlenmiştir.

Anahtar Kelimeler

• Dikme
• Tek Eksenli Kumaş
• Karbon Lifi
• Mekanik Test
• Polimer Kompozit

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