Buckling and energy absorption behavior of shell structure with a compliant core

This dissertation presents the study on buckling and energy absorption behavior of a thin-walled cylindrical shell with complaint core under axial compression. Previous studies related to this subject focused on its behavior with a fully or fixed amount of infill. The principal aim of current work i...

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Main Author: Ye, Lei
Other Authors: Lu Guoxing
Format: Theses and Dissertations
Language:English
Published: 2012
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Online Access:https://hdl.handle.net/10356/48914
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-489142023-03-11T17:30:05Z Buckling and energy absorption behavior of shell structure with a compliant core Ye, Lei Lu Guoxing School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Mechanics and dynamics This dissertation presents the study on buckling and energy absorption behavior of a thin-walled cylindrical shell with complaint core under axial compression. Previous studies related to this subject focused on its behavior with a fully or fixed amount of infill. The principal aim of current work is to study the effect of partially filled foam core on its behavior in initial buckling, post-buckling and energy absorption. An energy-based technique is applied in initial buckling to obtain the theoretical solution of the critical buckling load, for an axisymmetric mode with partial infill. This solution has been verified by a subsequent finite element analysis. A comprehensive parametric study indicates that in practical design the filler's inner radius should not be more than 10% of the shell radius. A finite element analysis is then performed for the post-buckling behaviour. With an initial geometric imperfection applied, the previously observed large discrepancy between theory and experiment is quantitatively resolved. It reveals that the critical buckling load obtained in the experiments is closely located in the post-buckling region. Furthermore, the plateau load of such a structure with this specific imperfection is formulated. For a shell with thickness h, the post-buckling dimple requires a compressive force proportional to h2.5 in order to hold the dimple in place. For energy absorption, an analytical model is proposed to predict its axisymmetric crushing behavior with partial infill, by the energy balance method. This solution has been verified by a finite element analysis and experiments. Further axial crushing tests and corresponding finite element simulations are performed to study the non-axisymmetric behavior of shells with a diameter-to-thickness (D/h) ratio up to 660. The study suggests that the filler's inner radius should not be more than 50% of the shell radius in the design. The study is valuable in understanding the mechanisms and mechanics of the buckling and energy absorption behavior of thin-walled shells with foams. It provides guidelines for engineers in the design of such structures in order to achieve the optimal performance in terms of strength, energy absorption and weight. DOCTOR OF PHILOSOPHY (MAE) 2012-05-10T09:18:50Z 2012-05-10T09:18:50Z 2012 2012 Thesis Ye, L. (2012). Buckling and energy absorption behavior of shell structure with a compliant core. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/48914 10.32657/10356/48914 en 264 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering::Mechanics and dynamics
spellingShingle DRNTU::Engineering::Mechanical engineering::Mechanics and dynamics
Ye, Lei
Buckling and energy absorption behavior of shell structure with a compliant core
description This dissertation presents the study on buckling and energy absorption behavior of a thin-walled cylindrical shell with complaint core under axial compression. Previous studies related to this subject focused on its behavior with a fully or fixed amount of infill. The principal aim of current work is to study the effect of partially filled foam core on its behavior in initial buckling, post-buckling and energy absorption. An energy-based technique is applied in initial buckling to obtain the theoretical solution of the critical buckling load, for an axisymmetric mode with partial infill. This solution has been verified by a subsequent finite element analysis. A comprehensive parametric study indicates that in practical design the filler's inner radius should not be more than 10% of the shell radius. A finite element analysis is then performed for the post-buckling behaviour. With an initial geometric imperfection applied, the previously observed large discrepancy between theory and experiment is quantitatively resolved. It reveals that the critical buckling load obtained in the experiments is closely located in the post-buckling region. Furthermore, the plateau load of such a structure with this specific imperfection is formulated. For a shell with thickness h, the post-buckling dimple requires a compressive force proportional to h2.5 in order to hold the dimple in place. For energy absorption, an analytical model is proposed to predict its axisymmetric crushing behavior with partial infill, by the energy balance method. This solution has been verified by a finite element analysis and experiments. Further axial crushing tests and corresponding finite element simulations are performed to study the non-axisymmetric behavior of shells with a diameter-to-thickness (D/h) ratio up to 660. The study suggests that the filler's inner radius should not be more than 50% of the shell radius in the design. The study is valuable in understanding the mechanisms and mechanics of the buckling and energy absorption behavior of thin-walled shells with foams. It provides guidelines for engineers in the design of such structures in order to achieve the optimal performance in terms of strength, energy absorption and weight.
author2 Lu Guoxing
author_facet Lu Guoxing
Ye, Lei
format Theses and Dissertations
author Ye, Lei
author_sort Ye, Lei
title Buckling and energy absorption behavior of shell structure with a compliant core
title_short Buckling and energy absorption behavior of shell structure with a compliant core
title_full Buckling and energy absorption behavior of shell structure with a compliant core
title_fullStr Buckling and energy absorption behavior of shell structure with a compliant core
title_full_unstemmed Buckling and energy absorption behavior of shell structure with a compliant core
title_sort buckling and energy absorption behavior of shell structure with a compliant core
publishDate 2012
url https://hdl.handle.net/10356/48914
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