Water absorption behaviour and its effect on the mechanical properties of hybrid interwoven cellulosic fibre composites

With aim to fulfill the public need that eager for ‘green product’, natural based fibres started to receive attention to substitute synthetic fibres as reinforcement in composites. Natural fibres is relatively cheap, easy to get, non-toxic, non-abrasive, less harmful to human health and possessed hi...

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Format:	Thesis
Language:	English
Subjects:	Fibrous composites Composite materials Fibers Hybridization Kenaf
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78020/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78020/2/Full%20text.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78020/3/Maslinda.pdf
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spelling	my-unimap-780202023-03-07T00:46:10Z Water absorption behaviour and its effect on the mechanical properties of hybrid interwoven cellulosic fibre composites Mohd Shukry, Abdul Majid, Assoc. Prof. Ir. Dr. With aim to fulfill the public need that eager for ‘green product’, natural based fibres started to receive attention to substitute synthetic fibres as reinforcement in composites. Natural fibres is relatively cheap, easy to get, non-toxic, non-abrasive, less harmful to human health and possessed high specific strength and modulus which make them the perfect choice to reduce the dependence towards the petroleum based fibres. As the extension to the research involving woven and natural fibre hybrid composites, this study investigated the water absorption behaviour and its effect on the mechanical properties of hybrid cellulosic fibre composites. Hybrid composites consists of interwoven kenaf/jute and kenaf/hemp yarns were prepared by infusion process using epoxy as the matrix. Woven kenaf, jute and hemp composites were also prepared for comparison. Water absorption test were conducted according to ASTM D590 standard by immersing the composite samples in tap water at room temperature until the water content reach saturation. Dry and water immersed samples of both woven and interwoven hybrid composites then were subjected to tensile and flexural tests according to ASTM D638 and ASTM D790, respectively. Fractured portion of the samples were examined using field emission scanning electron microscope (FESEM) to observe the effect of water absorption towards the fiber/matrix interface. Water uptake was rapidly increased at the beginning and getting slower until reach saturation at 1400 hours of immersion time. Among individual woven composites, woven kenaf composite had the highest water uptake and through hybridization with jute and hemp fibres, water resistance properties of kenaf fibre were improved by 46 and 64%. At both, dry and wet condition, mechanical properties of interwoven hybrid composites was found to be greater than their individual woven composites. In dry condition, tensile and flexural strength of interwoven kenaf/jute hybrid composite were 11 and 22% higher than woven kenaf composite and 16 and 39% greater than woven jute composite. For dry samples of interwoven kenaf/hemp hybrid composite, increment of 4 and 17% over woven kenaf composite and 9 and 33% over woven hemp composite were recorded for their tensile and flexural strength. Similar as the dry samples, increase of tensile and flexural strength was also observed for the water immersed samples of the interwoven hybrid composites. Amount of water uptake increased as the immersion time increased and reduced the strength and modulus (tensile and flexural) of the water immersed samples. Tensile strength of woven kenaf, jute, hemp, interwoven kenaf/jute and kenaf/hemp hybrid composites at their saturation state were reduced by 75, 69, 67, 72 and 69% over their strength at dry condition. Following the similar sequence, flexural strength of the saturated samples also reduced by 73, 64, 57, 69 and 67% than the dry condition samples. Those reductions attributed by debonding, matrix cracking, and delamination as shown through the FESEM images. Universiti Malaysia Perlis (UniMAP) Thesis en http://dspace.unimap.edu.my:80/xmlui/handle/123456789/78020 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78020/4/license.txt 8a4605be74aa9ea9d79846c1fba20a33 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78020/1/Page%201-24.pdf 91299528f7ecfa61892b8c97974a0b13 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78020/2/Full%20text.pdf 82aae93135ff0e4efa7a490e8b435604 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78020/3/Maslinda.pdf 4a54d1b7dea2574495d30be53b800807 Universiti Malaysia Perlis (UniMAP) Fibrous composites Composite materials Fibers Hybridization Kenaf School of Mechatronic Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
advisor	Mohd Shukry, Abdul Majid, Assoc. Prof. Ir. Dr.
topic	Fibrous composites Composite materials Fibers Hybridization Kenaf
spellingShingle	Fibrous composites Composite materials Fibers Hybridization Kenaf Water absorption behaviour and its effect on the mechanical properties of hybrid interwoven cellulosic fibre composites
description	With aim to fulfill the public need that eager for ‘green product’, natural based fibres started to receive attention to substitute synthetic fibres as reinforcement in composites. Natural fibres is relatively cheap, easy to get, non-toxic, non-abrasive, less harmful to human health and possessed high specific strength and modulus which make them the perfect choice to reduce the dependence towards the petroleum based fibres. As the extension to the research involving woven and natural fibre hybrid composites, this study investigated the water absorption behaviour and its effect on the mechanical properties of hybrid cellulosic fibre composites. Hybrid composites consists of interwoven kenaf/jute and kenaf/hemp yarns were prepared by infusion process using epoxy as the matrix. Woven kenaf, jute and hemp composites were also prepared for comparison. Water absorption test were conducted according to ASTM D590 standard by immersing the composite samples in tap water at room temperature until the water content reach saturation. Dry and water immersed samples of both woven and interwoven hybrid composites then were subjected to tensile and flexural tests according to ASTM D638 and ASTM D790, respectively. Fractured portion of the samples were examined using field emission scanning electron microscope (FESEM) to observe the effect of water absorption towards the fiber/matrix interface. Water uptake was rapidly increased at the beginning and getting slower until reach saturation at 1400 hours of immersion time. Among individual woven composites, woven kenaf composite had the highest water uptake and through hybridization with jute and hemp fibres, water resistance properties of kenaf fibre were improved by 46 and 64%. At both, dry and wet condition, mechanical properties of interwoven hybrid composites was found to be greater than their individual woven composites. In dry condition, tensile and flexural strength of interwoven kenaf/jute hybrid composite were 11 and 22% higher than woven kenaf composite and 16 and 39% greater than woven jute composite. For dry samples of interwoven kenaf/hemp hybrid composite, increment of 4 and 17% over woven kenaf composite and 9 and 33% over woven hemp composite were recorded for their tensile and flexural strength. Similar as the dry samples, increase of tensile and flexural strength was also observed for the water immersed samples of the interwoven hybrid composites. Amount of water uptake increased as the immersion time increased and reduced the strength and modulus (tensile and flexural) of the water immersed samples. Tensile strength of woven kenaf, jute, hemp, interwoven kenaf/jute and kenaf/hemp hybrid composites at their saturation state were reduced by 75, 69, 67, 72 and 69% over their strength at dry condition. Following the similar sequence, flexural strength of the saturated samples also reduced by 73, 64, 57, 69 and 67% than the dry condition samples. Those reductions attributed by debonding, matrix cracking, and delamination as shown through the FESEM images.
format	Thesis
title	Water absorption behaviour and its effect on the mechanical properties of hybrid interwoven cellulosic fibre composites
title_short	Water absorption behaviour and its effect on the mechanical properties of hybrid interwoven cellulosic fibre composites
title_full	Water absorption behaviour and its effect on the mechanical properties of hybrid interwoven cellulosic fibre composites
title_fullStr	Water absorption behaviour and its effect on the mechanical properties of hybrid interwoven cellulosic fibre composites
title_full_unstemmed	Water absorption behaviour and its effect on the mechanical properties of hybrid interwoven cellulosic fibre composites
title_sort	water absorption behaviour and its effect on the mechanical properties of hybrid interwoven cellulosic fibre composites
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Mechatronic Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78020/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78020/2/Full%20text.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/78020/3/Maslinda.pdf
_version_	1776104279648501760

Water absorption behaviour and its effect on the mechanical properties of hybrid interwoven cellulosic fibre composites

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