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Mechanical behaviour and energy absorption performances of composite foam-filled circular tubes under axial loadings

Subramaniyan, S Kanna (2013) Mechanical behaviour and energy absorption performances of composite foam-filled circular tubes under axial loadings. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Structural foams and foam-filled thin-walled structures have good energy absorption properties and widely been used as energy absorbers especially in automotive industries. However, great demands for composite material contribute to potential application of natural fiber and recycled material as foam materials to be filled into tubes. Therefore, an experimental investigation was performed to study mechanical properties and energy absorption characteristics of composite polymeric foam-filled circular tubes under quasi-static and dynamic axial loading conditions. The foam-filled thin-walled circular tube was fabricated with high strength steel as its shell and polyurethane (PU) foam as its core. The PU foam was processed with an incorporation of kenaf fiber and recycled rubber particles at 2, 4, 6, 8 and 10% composition, respectively. The PU foam was produced based on three different fixed densities such as 0.1, 0.2 and 0.3 gcm-3. Foam compression test results indicated that composite foams with 6% filler content exhibit better mechanical properties than polyurethane foam itself. Overall, the compression strength and compression modulus was improved at 14.2% and 23.6%. Thereafter, the utilization of composite foam as filler for circular tubes has enhanced energy absorption performance of the tubes. The energy absorption capacity of composite foam-filled circular tube is higher than that of polyurethane foam-filled tubes. The crush characteristic of PU composite foam-filled tubes follows the favorable progressive collapse modes. Overall, results of the research indicate that PU composite foam with optimum 6% filler content effectively increases the foam mechanical behavior and its function as filler for tubes provides better energy absorption capacity under axial crushing events.

Item Type: Thesis (Masters)
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Depositing User: Normajihan Abd. Rahman
Date Deposited: 20 Jun 2016 02:35
Last Modified: 20 Jun 2016 02:35
URI: http://eprints.uthm.edu.my/id/eprint/3708
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