Influence of Fiber Stacking Sequence in Inter-ply Hybrid Composites Structures on the Mechanical and Dynamics Properties

Öz

With the new manufactured methods developed in recent years, the application areas of layered

composite structures have increased considerably. In order to increase the utilization performances of these

structures, hybrid composite structures were obtained by using single fabrics in different sequences. While many

studies have been carried out on the mechanical properties of layered hybrid composite structures, studies on

dynamic properties are not enough. In the scope of this work, samples with 4 layers with 4 different sequence

were manufactured by using VARTM (Vacuum Assisted Resin Transfer Moulding) method using single glass (G4)

and single carbon (C4) fibers. These samples are either single composite structures consisting of simple glass (C4)

and plain carbon (K4) or symmetric composites with different order of arrangements of these two fibers within the

same structure (CGGC and GCCG). Samples were cut from produced composite sheets for three point bending,

tensile and vibration tests according to the relevant ASTM standards. With three point bending tests determined

the maximum flexural strength of the samples. Tensile tests were performed to determine the young modulus of

the samples. In addition, natural frequency and damping ratio values were determined by free vibration analysis

under fixed-free boundary conditions. With the obtained results, the effect of sequence of interply hybrid composite

structures on the maximum flexural strength, the modulus of elasticity and vibrational properties was investigated.

Anahtar Kelimeler

• Damping ratio,flexural strength,interply hybrid composite,natural frequency

Inter-ply Hibrit Kompozit Yapılarda Elyaf Diziliş Sıralamasının Mekanik ve Dinamik Özelliklere Etkisi

Öz

Son yıllarda geliştirilen yeni üretim metotları ile tabakalı kompozit yapıların kullanım alanları dikkate

değer bir şekilde artmıştır. Bu yapıların kullanım performanslarını arttırmak amacıyla farklı tekil kumaşlar,

farklı diziliş sıraları ile aynı kompozit yapıda kullanılarak hibrit kompozit yapılar elde edilmiştir. Tabakalı hibrit

kompozit yapıların mekanik özellikleri ile ilgili birçok araştırma yapılmışken dinamik özellikleri ile ilgili yapılan

araştırmalar henüz yeterli değildir. Bu çalışma kapsamında; tekil cam (C) ve tekil karbon (K) elyaflar kullanılarak

VARTM (Vakum Destekli Reçine Transfer Kalıplama) yöntemi ile 4 tabakalı, 4 farklı diziliş sırasına sahip

numunelerin üretimi gerçekleştirilmiştir. Bu numuneler; sade cam (C4), sade karbon (K4) olmak üzere iki tekil

kompozit yapı ve bu iki elyaf türünün aynı yapı içerisinde simetrik olarak farklı diziliş sıralarıyla kullanılmasıyla

elde edilen iki farklı hibrit kompozit yapıdan (KCCK ve CKKC) oluşmaktadır. Üretilen kompozit levhalardan,

ilgili ASTM standartlarına göre üç nokta eğilme, çekme ve titreşim testleri için gerekli olan numuneler kesilerek

elde edilmiştir. Üç nokta eğilme testleri yapılarak numunelerin maksimum eğilme dayanımları ve çekme testleri

yapılarak numunelerin elastisite modülleri belirlenmiştir. Ayrıca ankastre-serbest sınır şartında serbest titreşim

analizleri yapılarak doğal frekans ve sönüm oranı değerleri tespit edilmiştir. Elde edilen sonuçlar ile interply hibrit

kompozit yapılarda diziliş sırasının maksimum eğilme dayanımı, elastisite modülü ve titreşim özelliklerine etkisi

incelenmiştir.

Anahtar Kelimeler

• Doğal frekans,eğilme dayanımı,interply hibrit kompozit,sönüm oranı

Kaynakça

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