Numerical analysis of shock wave propagation and AL5083 sheet bulging in explosive hydro forming process

The present work simulated the explosive forming of a torisperical dished head from the Al-5083 aluminum alloy against a male die. The simulation was used to investigate the strain distribution across the final product as well as to capture the complex nature behind this High Energy Rate Forming (HE...

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Main Author:	Jabalamelian, Saeed
Format:	Thesis
Language:	English
Published:	2012
Subjects:	Shock (Mechanics)
Online Access:	http://psasir.upm.edu.my/id/eprint/48481/1/FK%202012%20124R.pdf
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id	my-upm-ir.48481
record_format	uketd_dc
spelling	my-upm-ir.484812016-09-09T04:25:52Z Numerical analysis of shock wave propagation and AL5083 sheet bulging in explosive hydro forming process 2012-01 Jabalamelian, Saeed The present work simulated the explosive forming of a torisperical dished head from the Al-5083 aluminum alloy against a male die. The simulation was used to investigate the strain distribution across the final product as well as to capture the complex nature behind this High Energy Rate Forming (HERF) technique. The study was carried out in the framework of LS-DYNA code, based on the Arbitrary Lagrangian Eulerian (ALE) Multi-Material formulation, which provided a finite element mesh that moved independently from the material flow and allowed each element to contain a mixture of two or more different materials. The underwater explosion phenomenon including the shock wave propagation and the state of detonation products was perfectly simulated using the Jones-Wilkins-Lee (JWL) and Gruneisen equations of state for explosive and water, respectively. The results were validated based on the Cole’s experimental and analytical works on underwater explosion of relatively small charge, which showed the average error of 6.4%. The simulation outcomes showed that the primary shock could be modified by accelerating the specimen up to 100 m/s and reflecting back toward the water, which could lead to cavitations. The formation of the cavitations and their effects on the deformation of the specimen were investigated numerically; same as the other aspects of the desired process. Since many of these phenomena were too difficult to be investigated experimentally, a comprehensive understanding of the Explosive Hydro Forming (EHF) process was achieved through a numerical simulation in this study. The behavior of the specimen under explosive loading was predicted according to the Johnson-Cook (JC), Modified Zerilling-Armstrong (MZA) and Plastic-Kinematic (PK) constitutive equations, which were used to investigate the strain distribution across the final product. Moreover, three techniques were examined numerically involving increasing the ratio between the thickness and diameter of sheet plate, using the sheet holder and grooving the edge of the workpiece to reduce the wrinkling at the edge of the workpiece. Shock (Mechanics) 2012-01 Thesis http://psasir.upm.edu.my/id/eprint/48481/ http://psasir.upm.edu.my/id/eprint/48481/1/FK%202012%20124R.pdf application/pdf en public masters Universiti Putra Malaysia Shock (Mechanics)
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Shock (Mechanics)
spellingShingle	Shock (Mechanics) Jabalamelian, Saeed Numerical analysis of shock wave propagation and AL5083 sheet bulging in explosive hydro forming process
description	The present work simulated the explosive forming of a torisperical dished head from the Al-5083 aluminum alloy against a male die. The simulation was used to investigate the strain distribution across the final product as well as to capture the complex nature behind this High Energy Rate Forming (HERF) technique. The study was carried out in the framework of LS-DYNA code, based on the Arbitrary Lagrangian Eulerian (ALE) Multi-Material formulation, which provided a finite element mesh that moved independently from the material flow and allowed each element to contain a mixture of two or more different materials. The underwater explosion phenomenon including the shock wave propagation and the state of detonation products was perfectly simulated using the Jones-Wilkins-Lee (JWL) and Gruneisen equations of state for explosive and water, respectively. The results were validated based on the Cole’s experimental and analytical works on underwater explosion of relatively small charge, which showed the average error of 6.4%. The simulation outcomes showed that the primary shock could be modified by accelerating the specimen up to 100 m/s and reflecting back toward the water, which could lead to cavitations. The formation of the cavitations and their effects on the deformation of the specimen were investigated numerically; same as the other aspects of the desired process. Since many of these phenomena were too difficult to be investigated experimentally, a comprehensive understanding of the Explosive Hydro Forming (EHF) process was achieved through a numerical simulation in this study. The behavior of the specimen under explosive loading was predicted according to the Johnson-Cook (JC), Modified Zerilling-Armstrong (MZA) and Plastic-Kinematic (PK) constitutive equations, which were used to investigate the strain distribution across the final product. Moreover, three techniques were examined numerically involving increasing the ratio between the thickness and diameter of sheet plate, using the sheet holder and grooving the edge of the workpiece to reduce the wrinkling at the edge of the workpiece.
format	Thesis
qualification_level	Master's degree
author	Jabalamelian, Saeed
author_facet	Jabalamelian, Saeed
author_sort	Jabalamelian, Saeed
title	Numerical analysis of shock wave propagation and AL5083 sheet bulging in explosive hydro forming process
title_short	Numerical analysis of shock wave propagation and AL5083 sheet bulging in explosive hydro forming process
title_full	Numerical analysis of shock wave propagation and AL5083 sheet bulging in explosive hydro forming process
title_fullStr	Numerical analysis of shock wave propagation and AL5083 sheet bulging in explosive hydro forming process
title_full_unstemmed	Numerical analysis of shock wave propagation and AL5083 sheet bulging in explosive hydro forming process
title_sort	numerical analysis of shock wave propagation and al5083 sheet bulging in explosive hydro forming process
granting_institution	Universiti Putra Malaysia
publishDate	2012
url	http://psasir.upm.edu.my/id/eprint/48481/1/FK%202012%20124R.pdf
_version_	1747811987239206912

Numerical analysis of shock wave propagation and AL5083 sheet bulging in explosive hydro forming process

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