Critical impact energy for local impact damage of hard projectile on concrete slab

Concrete is a common construction material used to build conventional, un�conventional, and sensitive structures. Great demand exists for efficient designing of concrete as protective structures against impact loading generated by natural disasters and consciously engendered unpleasant incidents...

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Main Author:	Bux @ Imran Latif, Qadir
Format:	Thesis
Language:	English
Published:	2012
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.uthm.edu.my/2478/1/24p%20QADIR%20BUX%20%40%20IMRAN%20LATIF.pdf
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spelling	my-uthm-ep.24782022-02-03T01:51:34Z Critical impact energy for local impact damage of hard projectile on concrete slab 2012-06 Bux @ Imran Latif, Qadir TA Engineering (General). Civil engineering (General) TA401-492 Materials of engineering and construction. Mechanics of materials Concrete is a common construction material used to build conventional, un�conventional, and sensitive structures. Great demand exists for efficient designing of concrete as protective structures against impact loading generated by natural disasters and consciously engendered unpleasant incidents etc. When hard projectile collides with concrete wall it is the impact energy of the projectile that makes concrete target to deform, which means impact energy is the dominant cause of damage in impact accidents. Hard missile impact can generate both local (penetration, scabbing, and perforation) and global impact damage. Local damage studies normally fall into three categories, i.e. empirical formulation, idealised analytical models, and numerical simulations. The present study is curiously focused on the required critical impact energy for occurrence of local impact damage in concrete structures generated by hard projectile, via three categories i). Numerical simulation, ii). Analytical modelling, and iii). Empirical formula The numerical simulations were conducted to determine the critical impact energy of ogive nose hard projectile which causes maximum penetration in to the concrete structures. The effects of diameter and CRH ratio of ogive nose hard projectile on critical impact energy were also analysed. An analytical model is developed to predict the required critical impact energy for spalling, tunnelling and penetration in concrete target. A nose shape factor (Ni) also has been introduced with empirical friction factor (Nf) in Chen and Li nose shape factor (N* ), to analyze the effects of nose shape on critical impact energy. Furthermore, an empirical formula also has been developed. The early stage scabbing phenomenon has been observed through the wave propagation in simulations with fully elastic model assumptions. The critical impact energy required for scabbing of concrete target and the effects of diameter of projectile (d) and the target thickness (H) on critical impact energy has been observed. An analytical model is developed based on 1-Dimensional with reflected wave propagation, and shear assumptions. Furthermore, an empirical formula also has been introduced. For perforation, the penetration numerical simulations have been further extended to achieve perforation in deep concrete against impact of ogive nose hard projectile with CRH = (3.0, 4.25, and 6.0). The required critical impact energy and residual impact energy has been analysed. Furthermore, the modifications in Li and Reid (2006) perforation model also have been done. In Addition a new empirical formula also has been introduced. The out come of this study can be used for making design recommendation and design procedures for determining the dynamic response of the concrete target to prevent local impact damage 2012-06 Thesis http://eprints.uthm.edu.my/2478/ http://eprints.uthm.edu.my/2478/1/24p%20QADIR%20BUX%20%40%20IMRAN%20LATIF.pdf text en public phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Awam dan Alam Bina
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General) TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) TA Engineering (General) Civil engineering (General) Bux @ Imran Latif, Qadir Critical impact energy for local impact damage of hard projectile on concrete slab
description	Concrete is a common construction material used to build conventional, un�conventional, and sensitive structures. Great demand exists for efficient designing of concrete as protective structures against impact loading generated by natural disasters and consciously engendered unpleasant incidents etc. When hard projectile collides with concrete wall it is the impact energy of the projectile that makes concrete target to deform, which means impact energy is the dominant cause of damage in impact accidents. Hard missile impact can generate both local (penetration, scabbing, and perforation) and global impact damage. Local damage studies normally fall into three categories, i.e. empirical formulation, idealised analytical models, and numerical simulations. The present study is curiously focused on the required critical impact energy for occurrence of local impact damage in concrete structures generated by hard projectile, via three categories i). Numerical simulation, ii). Analytical modelling, and iii). Empirical formula The numerical simulations were conducted to determine the critical impact energy of ogive nose hard projectile which causes maximum penetration in to the concrete structures. The effects of diameter and CRH ratio of ogive nose hard projectile on critical impact energy were also analysed. An analytical model is developed to predict the required critical impact energy for spalling, tunnelling and penetration in concrete target. A nose shape factor (Ni) also has been introduced with empirical friction factor (Nf) in Chen and Li nose shape factor (N* ), to analyze the effects of nose shape on critical impact energy. Furthermore, an empirical formula also has been developed. The early stage scabbing phenomenon has been observed through the wave propagation in simulations with fully elastic model assumptions. The critical impact energy required for scabbing of concrete target and the effects of diameter of projectile (d) and the target thickness (H) on critical impact energy has been observed. An analytical model is developed based on 1-Dimensional with reflected wave propagation, and shear assumptions. Furthermore, an empirical formula also has been introduced. For perforation, the penetration numerical simulations have been further extended to achieve perforation in deep concrete against impact of ogive nose hard projectile with CRH = (3.0, 4.25, and 6.0). The required critical impact energy and residual impact energy has been analysed. Furthermore, the modifications in Li and Reid (2006) perforation model also have been done. In Addition a new empirical formula also has been introduced. The out come of this study can be used for making design recommendation and design procedures for determining the dynamic response of the concrete target to prevent local impact damage
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Bux @ Imran Latif, Qadir
author_facet	Bux @ Imran Latif, Qadir
author_sort	Bux @ Imran Latif, Qadir
title	Critical impact energy for local impact damage of hard projectile on concrete slab
title_short	Critical impact energy for local impact damage of hard projectile on concrete slab
title_full	Critical impact energy for local impact damage of hard projectile on concrete slab
title_fullStr	Critical impact energy for local impact damage of hard projectile on concrete slab
title_full_unstemmed	Critical impact energy for local impact damage of hard projectile on concrete slab
title_sort	critical impact energy for local impact damage of hard projectile on concrete slab
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Awam dan Alam Bina
publishDate	2012
url	http://eprints.uthm.edu.my/2478/1/24p%20QADIR%20BUX%20%40%20IMRAN%20LATIF.pdf
_version_	1747830962202345472

Critical impact energy for local impact damage of hard projectile on concrete slab

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