Effect of Fiber Thickness on Critical Fiber Ratio in Mechanical Tests of Nettle-Polymethylmethacrylate Composites

Year 2019, , 111 - 122, 30.06.2019

Kenan Büyükkaya

https://doi.org/10.31466/kfbd.554085

Abstract

The aim of this study was to determine the
critical ratios of fiber (vfcrit.) In nettle fiber/polymethyl methacrylate
composites depending on fiber thickness. Polymethyl methacrylate, a brittle
matrix, was used for this purpose. Nettle fiber, produced by natural method,
was used in the production of polymethylmethacrylate composites with nettle
fiber fiber with a ratio of 1,25%, 2,5, 3,75 and 5% by Hand
lay-up.The tensile strength, bending strength, and
impact strength of these compenents were used to obtain critical fiber ratios
based on the thickness of the fiber. The physical properties of the fiber and
its interaction with the matrix were determined by XRD and FITIR tests,
respectively. SEM images were examined with the help of the observed
microstructure of the fracture surfaces. According to the obtained data,
critical fiber diameter values in thick fibers are higher than thin fibers. The
results of the study showed that fine fibers had a positive effect on the
mechanical properties of the materials compared to thick fibers.

Keywords

Composite, Mechanical properties, Nettle fiber, Pmma, Critical volume ratio

Isırgan-Polimetilmetakrilat Kompozitlerin Mekanik Testlerinde Lif Kalınlığının Kritik Lif Oranına Etkisi

Abstract

Bu çalışmanın amacı, lif kalınlığına bağlı
olarak ısırgan lifi/ polimetilmetakrilat kompozitlerin mekanik testlerinde
lifin, kritik oranlarını ( vf_kritik.) ortaya koymaktır. Bu amaç için
gevrek bir matris olan polimetilmetakrilat kullanıldı. Doğal yöntemle üretilen
ısırgan lifi, elle yatırma yöntemi ile  %
1,25, 2,5, 3,75 ve % 5 hacim oranlarında ısırgan lifi takviyeli
polimetilmetakrilat kompozitlerin üretiminde kullanıldı. Bu kompzitlerde çekme,
eğilme ve darbe mukavemeti, testlerinden elde edilen grafiklerden faydalanılarak,
lif kalınlığına bağlı kritik fiber oranları tesbit edildi. Lifin fiziksel özellikleri
ve matris ile etkileşimi, sırasıyla XRD ve FITIR testleri ile belirlendi. SEM
görüntüleri kırılma yüzeylerinin gözlemlenen mikro yapısı yardımı ile
incelendi. Elde edilen verilere göre, kalın liflerde kritik lif çapı değerleri,
ince liflere göre daha yüksektir. Bu sonuç, ince liflerin kalın liflere oranla
malzemelerin mekanik özelliklerini olumlu yönde etkilediğini gösterir.

Keywords

Kompozit, Mekanik özellikler, Isırgan lifi, Pmma, Kritik hacım oranı .

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