Air-blast response of cellular material with a face plate: an analytical–numerical approach

M Aleyaasin, J J Harrigan, S R Reid

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17 Citations (Scopus)

Abstract

Abstract
The air-blast response of a sacrificial cladding consisting of a cellular material with a front face-plate is investigated. The cellular material is sandwiched between a rigid face-plate and a rigid support. The support represents the structure that is to be protected. The air blast is assumed to be an exponentially decaying pulse. The cellular material is idealised as rigid, perfectly-plastic, locking and the deformation is governed by the propagation of a compaction (shock) wave travelling through the material. A second order nonlinear ordinary differential equation is derived to predict the displacement of the face-plate and the compression of the cellular layer by coupling the reflected over-pressure with the stresses at the interface between the face-plate and the cellular material.

The cellular material may attenuate or enhance the shock transmitted to the structure. Extensive simulations are carried out to define the attenuation/enhancement boundary for a range of initial peak pressures and cladding parameters. Herein, enhancement is considered to occur if the shock front reaches the support. A new method of accounting for fluid–structure interaction (FSI) is derived. The predictions are compared to those with no FSI as well as an existing model that accounts for the FSI effect, but for a free-standing plate.
Original languageEnglish
Pages (from-to)64-70
Number of pages7
JournalInternational Journal of Mechanical Sciences
Volume91
Early online date20 Apr 2014
DOIs
Publication statusPublished - Feb 2015

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aerial explosions
foams
Air
overpressure
augmentation
shock fronts
interactions
locking
plastic deformation
shock waves
Ordinary differential equations
Shock waves
differential equations
attenuation
shock
Compaction
propagation
Plastics
predictions
pulses

Keywords

  • cellular material
  • blast response
  • fluid structure interaction (FSI)

Cite this

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title = "Air-blast response of cellular material with a face plate: an analytical–numerical approach",
abstract = "AbstractThe air-blast response of a sacrificial cladding consisting of a cellular material with a front face-plate is investigated. The cellular material is sandwiched between a rigid face-plate and a rigid support. The support represents the structure that is to be protected. The air blast is assumed to be an exponentially decaying pulse. The cellular material is idealised as rigid, perfectly-plastic, locking and the deformation is governed by the propagation of a compaction (shock) wave travelling through the material. A second order nonlinear ordinary differential equation is derived to predict the displacement of the face-plate and the compression of the cellular layer by coupling the reflected over-pressure with the stresses at the interface between the face-plate and the cellular material.The cellular material may attenuate or enhance the shock transmitted to the structure. Extensive simulations are carried out to define the attenuation/enhancement boundary for a range of initial peak pressures and cladding parameters. Herein, enhancement is considered to occur if the shock front reaches the support. A new method of accounting for fluid–structure interaction (FSI) is derived. The predictions are compared to those with no FSI as well as an existing model that accounts for the FSI effect, but for a free-standing plate.",
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author = "M Aleyaasin and Harrigan, {J J} and Reid, {S R}",
note = "Acknowledgement: The second author is grateful for the support provided by Lloyd׳s Register Foundation (LRF) to The Lloyd׳s Register Foundation Centre for Safety and Reliability Engineering at the University of Aberdeen. LRF supports the advancement of engineering-related education, and funds research and development that enhances safety of life at sea, on land and in the air.",
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AU - Aleyaasin, M

AU - Harrigan, J J

AU - Reid, S R

N1 - Acknowledgement: The second author is grateful for the support provided by Lloyd׳s Register Foundation (LRF) to The Lloyd׳s Register Foundation Centre for Safety and Reliability Engineering at the University of Aberdeen. LRF supports the advancement of engineering-related education, and funds research and development that enhances safety of life at sea, on land and in the air.

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N2 - AbstractThe air-blast response of a sacrificial cladding consisting of a cellular material with a front face-plate is investigated. The cellular material is sandwiched between a rigid face-plate and a rigid support. The support represents the structure that is to be protected. The air blast is assumed to be an exponentially decaying pulse. The cellular material is idealised as rigid, perfectly-plastic, locking and the deformation is governed by the propagation of a compaction (shock) wave travelling through the material. A second order nonlinear ordinary differential equation is derived to predict the displacement of the face-plate and the compression of the cellular layer by coupling the reflected over-pressure with the stresses at the interface between the face-plate and the cellular material.The cellular material may attenuate or enhance the shock transmitted to the structure. Extensive simulations are carried out to define the attenuation/enhancement boundary for a range of initial peak pressures and cladding parameters. Herein, enhancement is considered to occur if the shock front reaches the support. A new method of accounting for fluid–structure interaction (FSI) is derived. The predictions are compared to those with no FSI as well as an existing model that accounts for the FSI effect, but for a free-standing plate.

AB - AbstractThe air-blast response of a sacrificial cladding consisting of a cellular material with a front face-plate is investigated. The cellular material is sandwiched between a rigid face-plate and a rigid support. The support represents the structure that is to be protected. The air blast is assumed to be an exponentially decaying pulse. The cellular material is idealised as rigid, perfectly-plastic, locking and the deformation is governed by the propagation of a compaction (shock) wave travelling through the material. A second order nonlinear ordinary differential equation is derived to predict the displacement of the face-plate and the compression of the cellular layer by coupling the reflected over-pressure with the stresses at the interface between the face-plate and the cellular material.The cellular material may attenuate or enhance the shock transmitted to the structure. Extensive simulations are carried out to define the attenuation/enhancement boundary for a range of initial peak pressures and cladding parameters. Herein, enhancement is considered to occur if the shock front reaches the support. A new method of accounting for fluid–structure interaction (FSI) is derived. The predictions are compared to those with no FSI as well as an existing model that accounts for the FSI effect, but for a free-standing plate.

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