Refined numerical simulation of the mechanical behaviour of hollow sphere structures

Metallic Hollow Sphere Structures (MHSS) is a member of cellular metal family which have air cavities while the boundaries are made of solid metals. It offers plenty of advantages and are applicable in many fields such as automotive or architecture. In this project, two major problems pertaining sin...

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Main Author:	Sharmugham, Thinesh Kumar
Format:	Thesis
Language:	English
Published:	2009
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/9862/1/ThineshKumarSharmughamMFKM2009.pdf
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spelling	my-utm-ep.98622018-06-13T07:07:53Z Refined numerical simulation of the mechanical behaviour of hollow sphere structures 2009-05 Sharmugham, Thinesh Kumar TJ Mechanical engineering and machinery Metallic Hollow Sphere Structures (MHSS) is a member of cellular metal family which have air cavities while the boundaries are made of solid metals. It offers plenty of advantages and are applicable in many fields such as automotive or architecture. In this project, two major problems pertaining sintered MHSS were studied which are porosity in sphere walls and geometrical imperfection due to contact between spheres. Finite element analysis is the only methodology used in this project. The main objective of this project is to procure the mechanical properties of MHSS by incorporating the effect of these two problems into simulations. The analysis was divided into two parts which are porosity model and sphere model. The porosity models were used to obtain the mechanical properties of base material steel by taking porosity in sphere walls into account. Two different models were generated which are PC (primitive cubic) and FCC (face-centered cubic) which act as idealised porosity. These values were then used in sphere models as the material properties for MHSS. There are two different sphere models which are the 1.6 mm and 2.6 mm model. Geometrical imperfection effect is applied in these models. The simulations were run by mimicking a compression test. Initial findings proved that Young’s modulus, E, yield stress, oY and Poisson’s ratio, u, change with porosity percentage. The appropriate mechanical properties for 1.6 mm and 2.6 mm MHSS were acquired and used in MHSS simulations. Simulation results showed that the material properties decrease from no porosity model to FCC model. However, the difference between simulations and experimental results are big, which means better models need to be built to obtain better results. 2009-05 Thesis http://eprints.utm.my/id/eprint/9862/ http://eprints.utm.my/id/eprint/9862/1/ThineshKumarSharmughamMFKM2009.pdf application/pdf en public masters Universiti Teknologi Malaysia Faculty of Mechanical Engineering 1. Veyhl, C et al. Structural characterization of diffusion-bonded hollow sphere structures, Defect and Diffusion Forum, 200-201: 105-112. 2. Veyhl, C et al. Mechanical testing of diffusion bonded metallic hollow sphere structure, Defect and Diffusion Forum, 200-201: 85-96. 3. Sanders, W.S. Gibson, L.J. Mechanics of hollow sphere foams. Material Science and Engineering, 2003. 347: 70-85. 4. Sanders, W.S. Gibson, L.J. Mechanics of BCC and FCC hollow sphere foams. Material Science and Engineering, 2003. 352: 150-161. 5. Ã–chsner, A. Lamprecht, K. On the uniaxial compression behaviour of regular shaped cellular metal. Mechanics Research Commumnications, 2003. 30: 573-579. 6. Hayes, A.M. et al. Mechanics of linear cellular alloys. Mechanics of materials, 2004. 36: 691-713. 7. Yu, J.L. Li, J.R. Hu, S.S. Strain-rate effect and micro-structural optimization of cellular metals. Mechanics of materials, 2006. 38: 160-170. 8. Fiedler, T. Ã–chsner, A. On the anisotropy of adhesively bonded metallic hollow sphere structures. Scripta Materialia, 2008; 58: 695-698. 9. Karagiozova, D. Yu, T.X. Gao, Z.Y. Modelling of MHS cellular solid in large strains. International Journal of Mechanical Sciences, 2006. 48: 1273- 1286.
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Sharmugham, Thinesh Kumar Refined numerical simulation of the mechanical behaviour of hollow sphere structures
description	Metallic Hollow Sphere Structures (MHSS) is a member of cellular metal family which have air cavities while the boundaries are made of solid metals. It offers plenty of advantages and are applicable in many fields such as automotive or architecture. In this project, two major problems pertaining sintered MHSS were studied which are porosity in sphere walls and geometrical imperfection due to contact between spheres. Finite element analysis is the only methodology used in this project. The main objective of this project is to procure the mechanical properties of MHSS by incorporating the effect of these two problems into simulations. The analysis was divided into two parts which are porosity model and sphere model. The porosity models were used to obtain the mechanical properties of base material steel by taking porosity in sphere walls into account. Two different models were generated which are PC (primitive cubic) and FCC (face-centered cubic) which act as idealised porosity. These values were then used in sphere models as the material properties for MHSS. There are two different sphere models which are the 1.6 mm and 2.6 mm model. Geometrical imperfection effect is applied in these models. The simulations were run by mimicking a compression test. Initial findings proved that Young’s modulus, E, yield stress, oY and Poisson’s ratio, u, change with porosity percentage. The appropriate mechanical properties for 1.6 mm and 2.6 mm MHSS were acquired and used in MHSS simulations. Simulation results showed that the material properties decrease from no porosity model to FCC model. However, the difference between simulations and experimental results are big, which means better models need to be built to obtain better results.
format	Thesis
qualification_level	Master's degree
author	Sharmugham, Thinesh Kumar
author_facet	Sharmugham, Thinesh Kumar
author_sort	Sharmugham, Thinesh Kumar
title	Refined numerical simulation of the mechanical behaviour of hollow sphere structures
title_short	Refined numerical simulation of the mechanical behaviour of hollow sphere structures
title_full	Refined numerical simulation of the mechanical behaviour of hollow sphere structures
title_fullStr	Refined numerical simulation of the mechanical behaviour of hollow sphere structures
title_full_unstemmed	Refined numerical simulation of the mechanical behaviour of hollow sphere structures
title_sort	refined numerical simulation of the mechanical behaviour of hollow sphere structures
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Mechanical Engineering
publishDate	2009
url	http://eprints.utm.my/id/eprint/9862/1/ThineshKumarSharmughamMFKM2009.pdf
_version_	1747814782549884928

Refined numerical simulation of the mechanical behaviour of hollow sphere structures

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