Investigation of The Sound Absorption Behavior of Combed And Uncombed Fiber Reinforced / Polyester Composites

Year 2022, , 530 - 544, 15.12.2022

Kenan Büyükkaya

https://doi.org/10.31466/kfbd.1003508

Abstract

In this study, it was aimed to investigate the sound absorption properties of raw (uncombed) and combed fiber reinforced composites obtained from nettle plant growing naturally at 2100 altitude. In order to determine the sound absorption properties of different parts of the plant (bottom, middle, top), combed and uncombed fibers were classified as bottom, middle and top. Polymer composite test specimens were produced by reinforcing nettle fiber and raw fiber in different volume ratios (2.5, 5, 7.5, 10 %) to the polyester matrix. The sound absorption coefficients (normal incidence coefficient) of the composites were measured by the double microphone technique. The physical properties of the fibers (density, crystalline index, fiber diameter) were determined and the effects of these properties on sound absorption were discussed. Cross-sectional examinations of the fibers were revealed using scanning electron microscope images.
According to the data obtained from the nettle-reinforced composites, it was determined that the combed and fiber-reinforced materials obtained from the bottom and middle parts of the plant showed superior performance in terms of sound absorption. It was concluded that this difference was due to the physical properties of the fibers.

Keywords

Nettle fiber, composite, sound absorption, dual microphone, physical properties

Taranmış ve Taranmamış Isırgan Lifi Takviyeli /Polyester Kompozitlerin Ses Absorbsiyon Davranışlarının İncelenmesi

Abstract

Bu çalışmada, 2100 rakımda doğal olarak yetişen ısırgan bitkisinden elde edilmiş, ham(taranmamış) ve taranmış lif ile takviye edilmiş kompozitlerin ses absorbsiyon özelliklerinin incelenmesi amaçlanmıştır. Bitkinin farklı kısımlarının (dip,orta,tepe) ses emme özelliklerini belirlemek amacıyla taranmış ve taranmamış lifler, dip, orta ve tepe olmak üzere sınıflandırılmıştır. Polyester matrise farklı hacım oranlarında (2.5, 5, 7.5, 10 %) ısırgan elyafı ve ham elyaf takviye edilerek, polimer kompozit test numuneleri üretilmiştir. Kompozitlerin ses emme katsayıları (normal incidence absorption coefficient), çift mikrofon tekniği ile ölçülmüştür. Liflerin fiziksel özellikleri (yoğunluk, kristalin indeksi, lif çapı) belirlenmiş ve bu özelliklerin ses absorbsiyonuna etkileri tartışılmıştır. Liflerin kesit incelemeleri taramalı elektron mikroskobu görüntüleri kullanılarak ortaya konulmuştur.
Isırgan takviyeli kompozitlerden elde edilen verilere göre, taranmış ve bitkinin dip ve orta kısımlarından elde edilen lif ile takviye edilen malzemelerin, ses emme açısından daha üstün performans sergilediği belirlenmiştir. Bu farklılığın liflerin fiziksel özelliklerinden kaynaklandığı sonucuna varılmıştır. 

Keywords

Isırgan lifi, kompozit, ses emme, çift mikrofon, fiziksel özellikler., Nettle fiber, composite, sound absorption, dual microphone, physical properties

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