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Response of Armour Steel Plates to localised Air Blast Load – A Dimensional Analysis

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Title: Response of Armour Steel Plates to localised Air Blast Load – A Dimensional Analysis
Authors: Soleiman Fallah, A
Mehreganian, N
Boiger, GK
Louca, LA
Item Type: Journal Article
Abstract: We report on the results of dimensional analyses on the dynamic plastic response of square armour steel plates due to detonation of proximal cylindrical charges and ensued air blast loading. By assuming a generic function for the blast load, which is multiplicative comprising its spatial and temporal parts, a set of 14 dimensionless parameters, representative of the load and plate deformation, were identified and recast in the form of dimensionless functions of stand-off to charge diameter ratio. Parametric studies were performed using commercial code ABAQUS’s module of Finite Element hydrocode using MMALE and MMAE techniques, and combined with regression analyses to quantify the dimensional parameters and the expressions for dimensionless functions. A few numerical studies with various FE mesh types were also performed to validate the transient deflections against the small-scale experiments. For pulse loading due to proximal charges of small orders of stand-off/charge diameter ratio, the magnitude of the transverse deflection increased abruptly with incremental decrease in stand-off, in contradistinction to the plate deformations at higher stand-offs where variations in displacement are smooth. This confirmed the existence of a stand-off at which a transition in behaviour takes place. For stand-off values less than charge diameter, a dimensionless energy absorbing effectiveness factor was considered to investigate the prediction of rupture in the plate corresponding to different charge masses. This factor is measured as a baseline parameter to predict, using solely numerical means, the blast loads which ensue rupture on full-scale prototypes.
Issue Date: 1-Dec-2017
Date of Acceptance: 27-Sep-2017
URI: http://hdl.handle.net/10044/1/51638
ISSN: 1750-9548
Publisher: International Society of Multiphysics
Start Page: 387
End Page: 412
Journal / Book Title: International Journal of Multiphysics
Volume: 11
Issue: 4
Copyright Statement: Copyright (c) 2017 A Fallah, N Mehreganian, G Boiger, L Louca This work is licensed under a Creative Commons Attribution 4.0 International License.
Publication Status: Published
Appears in Collections:Civil and Environmental Engineering
Aeronautics
Faculty of Engineering