Dynamic axial and oblique crushing of foam-filled aluminium conical tubes

The aim of this study was to investigate the response of conical aluminium tubes subjected to dynamic axial and oblique loading. The effect of foam filling on the energy absorption for variation in geometry, tube material and filler density was evaluated and discussed. This study employs a nonlinea...

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Main Author:	Fauziah, Mat
Format:	Thesis
Language:	English
Subjects:	Conical aluminium Foam-filled aluminium Conical aluminium tubes Foam-filled tubes
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61516/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61516/2/Full%20text.pdf
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id	my-unimap-61516
record_format	uketd_dc
spelling	my-unimap-615162019-08-21T06:39:16Z Dynamic axial and oblique crushing of foam-filled aluminium conical tubes Fauziah, Mat Assoc. Prof. Dr. Khairul Azwan Ismail The aim of this study was to investigate the response of conical aluminium tubes subjected to dynamic axial and oblique loading. The effect of foam filling on the energy absorption for variation in geometry, tube material and filler density was evaluated and discussed. This study employs a nonlinear finite element model which was validated against experimental data. Main trends in the experimental results are well captured by the FE results under dynamic axial and oblique loading. Nevertheless, the differences observed under oblique loading between experimental and FE results are as high as 35.4 % particularly for energy absorption. These differences may due to uneven thickness and inability to constraint the movement of the tube at the fixed end (as per simulation) during experiment. The validated model was subsequently used to assess the beneficial of foam filling with respect to the variation of geometry, tube material and filler density. The identification of critical effective point which signifies the critical total tube mass and critical filler density with the approach taken in varying the semi apical angle and by keeping the bottom diameter constant proved to enhance the Specific Energy Absorption ( SEA) of foam-filled tube over that of empty tube. However, these approaches apply to only particular combination of geometrical parameters. Moreover, SEA of foam-filled tubes is found to loss its performance at a bottom diameter of 240 mm. On top of this, the maximum SEA is not necessarily obtained with achieving higher SEA of foam-filled tube over that of empty tube. These findings highlight the importance of appropriate selection of these parameters thus showing that these parameters can be controlled and hence permits an efficient dissipation of energy absorber which is beneficial for impact applications. With the intention of achieving enhanced performance foam-filled conical aluminium tube, multi-objective optimization is explored to search for multiple objective functions namely SEA and initial peak force under various loading. It is found that foam-filled straight aluminium tube is favoured in achieving optimum design under dynamic axial loading whilst empty conical tube is preferable under dynamic oblique loading. The information gained serves as a basis for future enhancement of aluminium tube energy absorber. Universiti Malaysia Perlis (UniMAP) 2015 Thesis en http://dspace.unimap.edu.my:80/xmlui/handle/123456789/61516 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61516/1/Page%201-24.pdf b317bbaf7d75e06bc5c98a11a2883484 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61516/2/Full%20text.pdf 15628027706bc3b88fc4e5179df2257d http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61516/3/license.txt 8a4605be74aa9ea9d79846c1fba20a33 Conical aluminium Foam-filled aluminium Conical aluminium tubes Foam-filled tubes School of Mechatronic Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
advisor	Assoc. Prof. Dr. Khairul Azwan Ismail
topic	Conical aluminium Foam-filled aluminium Conical aluminium tubes Foam-filled tubes
spellingShingle	Conical aluminium Foam-filled aluminium Conical aluminium tubes Foam-filled tubes Fauziah, Mat Dynamic axial and oblique crushing of foam-filled aluminium conical tubes
description	The aim of this study was to investigate the response of conical aluminium tubes subjected to dynamic axial and oblique loading. The effect of foam filling on the energy absorption for variation in geometry, tube material and filler density was evaluated and discussed. This study employs a nonlinear finite element model which was validated against experimental data. Main trends in the experimental results are well captured by the FE results under dynamic axial and oblique loading. Nevertheless, the differences observed under oblique loading between experimental and FE results are as high as 35.4 % particularly for energy absorption. These differences may due to uneven thickness and inability to constraint the movement of the tube at the fixed end (as per simulation) during experiment. The validated model was subsequently used to assess the beneficial of foam filling with respect to the variation of geometry, tube material and filler density. The identification of critical effective point which signifies the critical total tube mass and critical filler density with the approach taken in varying the semi apical angle and by keeping the bottom diameter constant proved to enhance the Specific Energy Absorption ( SEA) of foam-filled tube over that of empty tube. However, these approaches apply to only particular combination of geometrical parameters. Moreover, SEA of foam-filled tubes is found to loss its performance at a bottom diameter of 240 mm. On top of this, the maximum SEA is not necessarily obtained with achieving higher SEA of foam-filled tube over that of empty tube. These findings highlight the importance of appropriate selection of these parameters thus showing that these parameters can be controlled and hence permits an efficient dissipation of energy absorber which is beneficial for impact applications. With the intention of achieving enhanced performance foam-filled conical aluminium tube, multi-objective optimization is explored to search for multiple objective functions namely SEA and initial peak force under various loading. It is found that foam-filled straight aluminium tube is favoured in achieving optimum design under dynamic axial loading whilst empty conical tube is preferable under dynamic oblique loading. The information gained serves as a basis for future enhancement of aluminium tube energy absorber.
format	Thesis
author	Fauziah, Mat
author_facet	Fauziah, Mat
author_sort	Fauziah, Mat
title	Dynamic axial and oblique crushing of foam-filled aluminium conical tubes
title_short	Dynamic axial and oblique crushing of foam-filled aluminium conical tubes
title_full	Dynamic axial and oblique crushing of foam-filled aluminium conical tubes
title_fullStr	Dynamic axial and oblique crushing of foam-filled aluminium conical tubes
title_full_unstemmed	Dynamic axial and oblique crushing of foam-filled aluminium conical tubes
title_sort	dynamic axial and oblique crushing of foam-filled aluminium conical tubes
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Mechatronic Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61516/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61516/2/Full%20text.pdf
_version_	1747836840911568896

Dynamic axial and oblique crushing of foam-filled aluminium conical tubes

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