Fatigue Life Characteristic Of Hybrid Kenaf/Glass Fibre Reinforced Metal Laminates

Ng, Lin Feng (2017) Fatigue Life Characteristic Of Hybrid Kenaf/Glass Fibre Reinforced Metal Laminates. Masters thesis, Universiti Teknikal Malaysia Melaka.

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The fatigue life of hybrid composite reinforced metal laminates (FMLs) is worth investigating since such materials offer several superior characteristics over conventional metallic alloys. FML has been applied in a wide variety of applications especially in aircraft industry during the past decades. The increasing demand in industry for lightweight and high performance materials has stimulated the research interest towards FML haracteristics. The majority of researches have focused on the mechanical properties of hybrid composite materials and conventional synthetic based FMLs such as Glass Reinforced Aluminium Laminate (GLARE) and Aramid Reinforced Aluminium Laminate (ARALL). However, the fatigue life behaviour of hybrid composite reinforced FMLs still remains unexplored. This study investigated the fatigue life of a hybrid kenaf/glass reinforced metal laminate with different fibre configurations, orientations and stress ratios. The FML was manufactured through the hot press moulding compression method using annealed aluminium 5052 as the skin layers and the composite laminate as the core constituent. A tensile test was conducted at a quasi-static rate in accordance with ASTM E8, while a tension-tension fatigue test was conducted at force-controlled constant amplitude according to ASTM E466. The results revealed that hybridization improved the overall tensile and fatigue properties of the laminate. This was more prominent when specific properties were considered. The specific tensile strength of [G/K/G] FMLs is 2.27 % and 3.29 % higher than [G/G/G] FMLs for fibre orientation of 0º/90º and ±45º respectively. However, [K/G/K] FMLs showed the highest endurance strength which is 4.18 % and 13.90 % higher than [G/G/G] FMLs for both fibre orientations at stress ratio of 0.1. In terms of fatigue sensitivity, [K/G/K] FML was the lowest compared to other fibre configurations regardless of the fibre orientations and stress ratio. The FMLs, with a fibre orientation of 0º/90º, exhibited better tensile and fatigue strength than the FMLs with a fibre orientation of ±45º, regardless of the woven-ply fibre configuration and the FMLs with the fibre orientation of ±45º possessed lower fatigue sensitivity, thereby indicating that it was less sensitive to fatigue loading. Besides that, it was revealed that a higher stress ratio improved the fatigue life cycle of the FMLs structure as less damage was induced during the fatigue test. The overall results show the potential of using kenaf fibres as a substitution for glass fibres in FML sandwich structure.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Composite materials, Fracture, Fracture mechanics, Fatigue Life Characteristic, Hybrid Kenaf, Glass Fibre, Reinforced Metal Laminates
Subjects: T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Library > Tesis > FKP
Depositing User: Nor Aini Md. Jali
Date Deposited: 24 Apr 2018 08:37
Last Modified: 21 Feb 2022 10:30
URI: http://eprints.utem.edu.my/id/eprint/20708
Statistic Details: View Download Statistic

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