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

Bu çalışmanın amacı, lif kalınlığına bağlı olarak ısırgan lifi/ polimetilmetakrilat kompozitlerin mekanik testlerinde lifin, kritik oranlarını ( vfkritik.) 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.

Anahtar Kelimeler:

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

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

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,

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