Finite Element Modeling Of Ballistic Penetration into Fabric Armor

The goal of this work is to analyze the ballistic performance of plain woven fabric used in soft armor systems using a detailed finite element analysis at yarn level. As more complex materials systems are introduced in engineering practice, the design engineer faces the dilemma of utilizing homog...

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Main Author:	Talebi, Hossein
Format:	Thesis
Language:	English English
Published:	2006
Subjects:	Finite element method
Online Access:	http://psasir.upm.edu.my/id/eprint/5457/1/ITMA_2006_5.pdf
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spelling	my-upm-ir.54572013-05-27T07:22:58Z Finite Element Modeling Of Ballistic Penetration into Fabric Armor 2006 Talebi, Hossein The goal of this work is to analyze the ballistic performance of plain woven fabric used in soft armor systems using a detailed finite element analysis at yarn level. As more complex materials systems are introduced in engineering practice, the design engineer faces the dilemma of utilizing homogenization techniques or detailed numerical models. The latter offers a number of advantages, such as the ability to introduce separate constitutive laws and failure criteria for each phase, at the expense of computation cost. This is particularly important in ballistic performance of the soft armor where the projectile-fabric interaction and failure modes are complicated and can not be realized in other approaches. An automatic geometry generation algorithm for textile is developed that can generate complex fabric geometries spanning several unit cells. This program (named DYNTEX) based on the mentioned algorithm is designed using MATLAB code. A commercial finite element code named LS-DYNA is used as the solver and DYNTEX program is then extended to do the pre-processing for LS-DYNA. Four types of projectile shapes were chosen which consist of spherical, blunt, conical, hemi-spherical and a conically cylindrical military sized bullet. An orthotropic material with von-Mises stress at failure of 2.7GPa was chosen for material behavior of yarns. Since projectiles did not have considerable deformation, they assumed as rigid bodies. Furthermore a general surface to surface contact was selected for the contact between the yarns and projectile-fabric. Initial conditions and results of experimentations were extracted from literature to validate the simulation results for different projectile shapes. To verify the mesh built by DYNTEX program a relatively low velocity impact simulation performed in oblique angle. Then convergence analysis is then carried out by changing the mesh density of fabric target and it was shown primary mesh density was fine enough to start the remaining simulations. Finite element models of fabric impact were made with initial conditions extracted from literature and simulations were performed. The results of simulations showed close agreement with experimental tests. Moreover several parameters which affect the energy absorption of fabric were studied. These parameters were friction, boundary conditions, projectile nose diameter and projectile nose angle. The mentioned parameters were studied with respect to several projectile nose shapes and boundary conditions. Finite element method 2006 Thesis http://psasir.upm.edu.my/id/eprint/5457/ http://psasir.upm.edu.my/id/eprint/5457/1/ITMA_2006_5.pdf application/pdf en public masters Universiti Putra Malaysia Finite element method Institute of Advanced Technology English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Finite element method
spellingShingle	Finite element method Talebi, Hossein Finite Element Modeling Of Ballistic Penetration into Fabric Armor
description	The goal of this work is to analyze the ballistic performance of plain woven fabric used in soft armor systems using a detailed finite element analysis at yarn level. As more complex materials systems are introduced in engineering practice, the design engineer faces the dilemma of utilizing homogenization techniques or detailed numerical models. The latter offers a number of advantages, such as the ability to introduce separate constitutive laws and failure criteria for each phase, at the expense of computation cost. This is particularly important in ballistic performance of the soft armor where the projectile-fabric interaction and failure modes are complicated and can not be realized in other approaches. An automatic geometry generation algorithm for textile is developed that can generate complex fabric geometries spanning several unit cells. This program (named DYNTEX) based on the mentioned algorithm is designed using MATLAB code. A commercial finite element code named LS-DYNA is used as the solver and DYNTEX program is then extended to do the pre-processing for LS-DYNA. Four types of projectile shapes were chosen which consist of spherical, blunt, conical, hemi-spherical and a conically cylindrical military sized bullet. An orthotropic material with von-Mises stress at failure of 2.7GPa was chosen for material behavior of yarns. Since projectiles did not have considerable deformation, they assumed as rigid bodies. Furthermore a general surface to surface contact was selected for the contact between the yarns and projectile-fabric. Initial conditions and results of experimentations were extracted from literature to validate the simulation results for different projectile shapes. To verify the mesh built by DYNTEX program a relatively low velocity impact simulation performed in oblique angle. Then convergence analysis is then carried out by changing the mesh density of fabric target and it was shown primary mesh density was fine enough to start the remaining simulations. Finite element models of fabric impact were made with initial conditions extracted from literature and simulations were performed. The results of simulations showed close agreement with experimental tests. Moreover several parameters which affect the energy absorption of fabric were studied. These parameters were friction, boundary conditions, projectile nose diameter and projectile nose angle. The mentioned parameters were studied with respect to several projectile nose shapes and boundary conditions.
format	Thesis
qualification_level	Master's degree
author	Talebi, Hossein
author_facet	Talebi, Hossein
author_sort	Talebi, Hossein
title	Finite Element Modeling Of Ballistic Penetration into Fabric Armor
title_short	Finite Element Modeling Of Ballistic Penetration into Fabric Armor
title_full	Finite Element Modeling Of Ballistic Penetration into Fabric Armor
title_fullStr	Finite Element Modeling Of Ballistic Penetration into Fabric Armor
title_full_unstemmed	Finite Element Modeling Of Ballistic Penetration into Fabric Armor
title_sort	finite element modeling of ballistic penetration into fabric armor
granting_institution	Universiti Putra Malaysia
granting_department	Institute of Advanced Technology
publishDate	2006
url	http://psasir.upm.edu.my/id/eprint/5457/1/ITMA_2006_5.pdf
_version_	1747810429817585664

Finite Element Modeling Of Ballistic Penetration into Fabric Armor

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