Bending collapse and energy absorption of conventional and insert-reinforced closed-hat-section beams / Hafizan Hashim

Closed-hat-sections are a generic form of structural profiles used in vehicular structures. The bending behavior of a closed-hat-section beam is largely dependent on its section shape, dimension, and material. Despite being used widely in many applications, extensive study on design development and...

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Main Author:	Hashim, Hafizan
Format:	Thesis
Language:	English
Published:	2017
Subjects:	Machine shops and machine shop practice
Online Access:	https://ir.uitm.edu.my/id/eprint/27771/2/27771.pdf
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id	my-uitm-ir.27771
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spelling	my-uitm-ir.277712024-02-21T01:18:26Z Bending collapse and energy absorption of conventional and insert-reinforced closed-hat-section beams / Hafizan Hashim 2017 Hashim, Hafizan Machine shops and machine shop practice Closed-hat-sections are a generic form of structural profiles used in vehicular structures. The bending behavior of a closed-hat-section beam is largely dependent on its section shape, dimension, and material. Despite being used widely in many applications, extensive study on design development and research information are still lacking. Introducing the insert-reinforcement into conventional design of closed-hat section beam offers possibility of improving the bending resistant as well as energy absorption performance such as SEA, CFE, and DAF for energy absorber application. The primary aim of this thesis was to generate research and design information on the collapse mechanism, impact, and energy absorption characteristics of conventional and insert-reinforced closed -hat-section beams in order to facilitate their application in energy absorbing systems. A series of validation procedures of FE models through experiment and remodel were described. The validated FE models were used in parametric study of quasi-static and impact bending. To further analyze their collapse mechanism and analytical solution, two established analytical models for pure bending and one for three-point bending condition were modified and validated via FE simulation. Both analytical models for pure bending were derived using energy method and the three-point bending was derived using force-moment equilibrium method. Research findings show that the energy absorption response can be controlled by varying some of the geometries and number of insert. The wall thickness, web, and flange width can be used as parameters to control the amount of absorbed energy. However, the greatest effect on absorbed energy is the wall thickness. It was also evident that insert reinforcement can enhance the energy absorption capacity and reduces the inertia effect sensitivity by providing more plastic deformation during bending. Nevertheless, as far as energy absorption performance is concerned, higher number of insert seems to have a lower or similar performance with fewer insert reinforcement or even with conventional beam. Here, the use of ultra light-weight insert such as Magnesium and hybrid composite is desirable. The modified analytical models for pure bending have resulted in complex limit equations and were solved using numerical approach. Moment-rotation relationships acquired from both solutions showed good agreement with simulation. Another analytical solution has successfully predicted the pattern of load-deflection relationship under point bending. Useful empirical models to simplify the lengthy analytical solutions were also developed to predict the moment-rotation curves of conventional and insert-reinforced closed-hat-section beams as described in this thesis. 2017 Thesis https://ir.uitm.edu.my/id/eprint/27771/ https://ir.uitm.edu.my/id/eprint/27771/2/27771.pdf text en public phd doctoral Universiti Teknologi MARA Faculty of Mechanical Engineering
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Machine shops and machine shop practice
spellingShingle	Machine shops and machine shop practice Hashim, Hafizan Bending collapse and energy absorption of conventional and insert-reinforced closed-hat-section beams / Hafizan Hashim
description	Closed-hat-sections are a generic form of structural profiles used in vehicular structures. The bending behavior of a closed-hat-section beam is largely dependent on its section shape, dimension, and material. Despite being used widely in many applications, extensive study on design development and research information are still lacking. Introducing the insert-reinforcement into conventional design of closed-hat section beam offers possibility of improving the bending resistant as well as energy absorption performance such as SEA, CFE, and DAF for energy absorber application. The primary aim of this thesis was to generate research and design information on the collapse mechanism, impact, and energy absorption characteristics of conventional and insert-reinforced closed -hat-section beams in order to facilitate their application in energy absorbing systems. A series of validation procedures of FE models through experiment and remodel were described. The validated FE models were used in parametric study of quasi-static and impact bending. To further analyze their collapse mechanism and analytical solution, two established analytical models for pure bending and one for three-point bending condition were modified and validated via FE simulation. Both analytical models for pure bending were derived using energy method and the three-point bending was derived using force-moment equilibrium method. Research findings show that the energy absorption response can be controlled by varying some of the geometries and number of insert. The wall thickness, web, and flange width can be used as parameters to control the amount of absorbed energy. However, the greatest effect on absorbed energy is the wall thickness. It was also evident that insert reinforcement can enhance the energy absorption capacity and reduces the inertia effect sensitivity by providing more plastic deformation during bending. Nevertheless, as far as energy absorption performance is concerned, higher number of insert seems to have a lower or similar performance with fewer insert reinforcement or even with conventional beam. Here, the use of ultra light-weight insert such as Magnesium and hybrid composite is desirable. The modified analytical models for pure bending have resulted in complex limit equations and were solved using numerical approach. Moment-rotation relationships acquired from both solutions showed good agreement with simulation. Another analytical solution has successfully predicted the pattern of load-deflection relationship under point bending. Useful empirical models to simplify the lengthy analytical solutions were also developed to predict the moment-rotation curves of conventional and insert-reinforced closed-hat-section beams as described in this thesis.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Hashim, Hafizan
author_facet	Hashim, Hafizan
author_sort	Hashim, Hafizan
title	Bending collapse and energy absorption of conventional and insert-reinforced closed-hat-section beams / Hafizan Hashim
title_short	Bending collapse and energy absorption of conventional and insert-reinforced closed-hat-section beams / Hafizan Hashim
title_full	Bending collapse and energy absorption of conventional and insert-reinforced closed-hat-section beams / Hafizan Hashim
title_fullStr	Bending collapse and energy absorption of conventional and insert-reinforced closed-hat-section beams / Hafizan Hashim
title_full_unstemmed	Bending collapse and energy absorption of conventional and insert-reinforced closed-hat-section beams / Hafizan Hashim
title_sort	bending collapse and energy absorption of conventional and insert-reinforced closed-hat-section beams / hafizan hashim
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Mechanical Engineering
publishDate	2017
url	https://ir.uitm.edu.my/id/eprint/27771/2/27771.pdf
_version_	1794191809698594816

Bending collapse and energy absorption of conventional and insert-reinforced closed-hat-section beams / Hafizan Hashim

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