FARKLI BOYUTLARDA FINDIKKABUĞU PARTİKÜL TAKVİYELİ PMMA KOMPOZİTLERİN MEKANİK VE KIRILMA DAVRANIŞLARININ İNCELENMESİ.

Öz

Tarımsal atıkların kullanımı, çevresel hassasiyetlerin artması ve atıkların ekonomiye kazandırılması gibi duyarlılıklardan dolayı gün geçtikçe yaygınlaşmaktadır. Bu çalışmanın amacı atık olarak değerlendirilen fındıkkabuğunun kompozit malzeme üretiminde kullanılabilirliğini araştırmaktır. Çalışmada, farklı boyutlara (maksimum: 50, 150, 250, 425 µm) ve ağırlıklara (5, 10, 15, 20 ) sahip fındıkkabuğu partikülleri dolgusu ile üretilen kompozit numunelere, ısıl kür işleminden sonra a/W= 0,3 olan başlangıç çentiği açılmıştır. Bu numunelerin mod I kırılma davranışları üç nokta eğme testi yardımı ile belirlenmiştir. Kritik Gerilme Şiddet Faktörü, Başlangıç Çentik Derinliği metodu yardımı ile hesaplanmıştır. Eğilme modülü ve eğilme gerilmeleri üç nokta eğme testi ile darbe dayanımı değerleri de Standart çentikler kullanılarak belirlenmiştir. Fındıkkabuğu /polimetilmetakrilat kompozitlerin bileşimi ve mikro yapısı Fouirer Transform Infrared Spektrofotometre ve Scanning Electron Microscope çalışmaları ile ortaya konulmuştur. Araştırmanın bulgularına göre, 0-50 µm boyutlarında fındıkkabuğu partikülleri ile üretilen kompozitlerin mekanik özellikleri daha büyük boyutlu kompozitlerden daha yüksektir.

Anahtar Kelimeler

• Kompozit
• Fındık Kabuğu Partikülü
• Mekanik özellikler
• PMMA
• Kırılma Tokluğu

INVESTIGATION OF MECHANICAL AND FRACTURE BEHAVIOR OF NUTSHELL IN DIFFERENT SIZES PARTİCLE REİNFORCED PMMA COMPOSITES

Öz

The use of agricultural waste is becoming more widespread day by day due to increasing environmental sensitivity and bringing waste into the economy. The aim of this study is to investigate the usability of hazelnut shells, which are treated as waste, in the production of composite materials. The composite test material was produced with a filling of hazelnut shell particles with maximum dimensions of 50, 150, 250, 425 µm and weight ratios of 5%, 10%, 15%, 20%. After the thermal curing process, an initial notch was made on the samples with an initial notch ratio (Notch length / Sample width) a/W = 0.3. Mode I (crack opening) fracture behavior of these samples was determined with the help of three-point bending test. Critical Stress Intensity Factor was calculated with the help of the Initial Notch Depth method. Flexural modulus and bending stresses were determined using the three-point bending test, and impact strength values were determined using Standard notches. The composition and microstructure of hazelnut shell / polymethylmethacrylate composites were revealed by Fourer Transform Infrared Spectrophotometer and Scanning Electron Microscope measurements. According to the findings of the research, the mechanical properties of composites produced with 0-50 µm sized hazelnut shell particles are higher than composites produced with large-sized reinforcement.

Anahtar Kelimeler

• Composite
• Hazelnut Shell Particle
• Mechanical Properties
• PMMA
• Fracture Toughness

Kaynakça

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