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Characterization of low velocity impact damage of gamma-irradiated kevlar/oil palm empty fruit bunch hybrid composites

Malaysia, the second world largest exporter of palm oil has generated abundance of oil palm empty fruit bunch (EFB) waste. The oil palm EFB has the potential as the reinforcement in composites for energy absorption applications. In this work, the oil palm EFB were hybr...

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Main Author: Muhammad Amir, Siti Madiha
Format: Thesis
Language:English
Published: 2019
Subjects:
Composite materials
Online Access:http://psasir.upm.edu.my/id/eprint/84375/1/FK%202019%20135%20-%20ir.pdf
http://psasir.upm.edu.my/id/eprint/84375/
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spelling my.upm.eprints.843752022-01-04T00:54:17Z http://psasir.upm.edu.my/id/eprint/84375/ Characterization of low velocity impact damage of gamma-irradiated kevlar/oil palm empty fruit bunch hybrid composites Muhammad Amir, Siti Madiha Malaysia, the second world largest exporter of palm oil has generated abundance of oil palm empty fruit bunch (EFB) waste. The oil palm EFB has the potential as the reinforcement in composites for energy absorption applications. In this work, the oil palm EFB were hybridized with Kevlar fabric using hand lay-up technique with different layering patterns. The composites were exposed to gamma radiation dose, i.e. 25 kGy, 50 kGy and 150 kGy. Material characterization were carried out to evaluate the effects of radiation on its mechanical and physical properties of the materials. Low velocity impact and compression after impact tests were performed in this study. Damage propagation were observed using Ultrasonic C-Scan, Computed Thermography and Acoustic Emission methods. The tensile and flexural showed that hybrid composites were 48% and 45% respectively higher in hybrid composites with Kevlar as the skin. The compressive strength was 69% for hybrid composites with oil palm EFB as the skin. The optimum dose for tensile was at 25 kGy and 50 kGy for flexural and compression. At 150 kGy, the degradation of mechanical properties were observed. The density of hybrid composites for Kevlar as the skin was 0.89 g/cm³. Irradiated composites were observed to have lower water absorption capacity. The impact resistance of the irradiated Kevlar/oil palm EFB hybrid composites was up to 35 J. In damage detection, the images from ultrasonic-C-Scan method did not reflect the actual images observed. Computed tomography and acoustic emission complemented each other in detecting the matrix cracking, delamination and fibre breakage damages in the hybrid composites. From the compression after impact test, it was observed that the compressive residual strength was decreased when the impact energy increased. The optimum radiation dose to withstand the compressive residual strength for 35 J was at 50 kGy. The newly developed hybrid Kevlar/oil palm EFB composites have the potential to be used in energy absorption applications and exposure to gamma radiation is one of the methods to improve its mechanical strength of the hybrid materials for monotonic loading applications. 2019-05 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/84375/1/FK%202019%20135%20-%20ir.pdf Muhammad Amir, Siti Madiha (2019) Characterization of low velocity impact damage of gamma-irradiated kevlar/oil palm empty fruit bunch hybrid composites. Doctoral thesis, Universiti Putra Malaysia. Composite materials
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
topic Composite materials
spellingShingle Composite materials
Muhammad Amir, Siti Madiha
Characterization of low velocity impact damage of gamma-irradiated kevlar/oil palm empty fruit bunch hybrid composites
description Malaysia, the second world largest exporter of palm oil has generated abundance of oil palm empty fruit bunch (EFB) waste. The oil palm EFB has the potential as the reinforcement in composites for energy absorption applications. In this work, the oil palm EFB were hybridized with Kevlar fabric using hand lay-up technique with different layering patterns. The composites were exposed to gamma radiation dose, i.e. 25 kGy, 50 kGy and 150 kGy. Material characterization were carried out to evaluate the effects of radiation on its mechanical and physical properties of the materials. Low velocity impact and compression after impact tests were performed in this study. Damage propagation were observed using Ultrasonic C-Scan, Computed Thermography and Acoustic Emission methods. The tensile and flexural showed that hybrid composites were 48% and 45% respectively higher in hybrid composites with Kevlar as the skin. The compressive strength was 69% for hybrid composites with oil palm EFB as the skin. The optimum dose for tensile was at 25 kGy and 50 kGy for flexural and compression. At 150 kGy, the degradation of mechanical properties were observed. The density of hybrid composites for Kevlar as the skin was 0.89 g/cm³. Irradiated composites were observed to have lower water absorption capacity. The impact resistance of the irradiated Kevlar/oil palm EFB hybrid composites was up to 35 J. In damage detection, the images from ultrasonic-C-Scan method did not reflect the actual images observed. Computed tomography and acoustic emission complemented each other in detecting the matrix cracking, delamination and fibre breakage damages in the hybrid composites. From the compression after impact test, it was observed that the compressive residual strength was decreased when the impact energy increased. The optimum radiation dose to withstand the compressive residual strength for 35 J was at 50 kGy. The newly developed hybrid Kevlar/oil palm EFB composites have the potential to be used in energy absorption applications and exposure to gamma radiation is one of the methods to improve its mechanical strength of the hybrid materials for monotonic loading applications.
format Thesis
author Muhammad Amir, Siti Madiha
author_facet Muhammad Amir, Siti Madiha
author_sort Muhammad Amir, Siti Madiha
title Characterization of low velocity impact damage of gamma-irradiated kevlar/oil palm empty fruit bunch hybrid composites
title_short Characterization of low velocity impact damage of gamma-irradiated kevlar/oil palm empty fruit bunch hybrid composites
title_full Characterization of low velocity impact damage of gamma-irradiated kevlar/oil palm empty fruit bunch hybrid composites
title_fullStr Characterization of low velocity impact damage of gamma-irradiated kevlar/oil palm empty fruit bunch hybrid composites
title_full_unstemmed Characterization of low velocity impact damage of gamma-irradiated kevlar/oil palm empty fruit bunch hybrid composites
title_sort characterization of low velocity impact damage of gamma-irradiated kevlar/oil palm empty fruit bunch hybrid composites
publishDate 2019
url http://psasir.upm.edu.my/id/eprint/84375/1/FK%202019%20135%20-%20ir.pdf
http://psasir.upm.edu.my/id/eprint/84375/
_version_ 1724075430514786304
score 13.211869

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