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

M Aleyaasin, J J Harrigan, S R Reid

Research output: Contribution to journalArticle

22 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

Keywords

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

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