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SUMMARY:On energy and momentum transfer to deformable structures from unde
 rwater explosions and air blast - P J Tan\, University College London
DTSTART:20140117T140000Z
DTEND:20140117T150000Z
UID:TALK50091@talks.cam.ac.uk
CONTACT:Ms Helen Gardner
DESCRIPTION:The momentum transfer by a planar wave impinging upon a rigid 
 freestanding plate in water\, a largely incompressible medium\, is well un
 derstood [1]. Kambouchev et al. [2] extended the results of Taylor [1] to 
 include the nonlinear effects of compressibility whilst Hutchinson [3] has
  addressed the issues of energy and momentum transfer to a rigid\, freesta
 nding plate. In this presentation\, key conclusions from the aforementione
 d studies will be critically re-examined in the context of a flexible\, `f
 ully-clamped' elasto-plastic beam both under water and in air. The dynamic
  response of the elasto-plastic beam will be modelled as an equivalent sin
 gle-degree-of-freedom (SDOF) system. A numerical method based on a Lagrang
 ian formulation of the Euler equations of compressible flow and convention
 al shock-capturing techniques\, similar to that employed in [2\, 3]\, are 
 employed to solve numerically the interaction between the blast wave and s
 tructure. Particular emphasis will be placed on elucidating the energy and
  momentum transferred to the structure compared to its rigid\, freestandin
 g counterpart and on whether enhancement in the beneficial effects of FSI 
 remains\, and to what extent. \n\n\nReferences\n\n[1] G. I. Taylor\, in: T
 he pressure and impulse of submarine explosion waves on plates\, edited by
  G.K. Batchelor\, Vol.3 of The Scientific Papers of Sir Geoffrey Ingram Ta
 ylor\, Cambridge University Press\, Cambridge (1963) 287–303.\n[2] N. Ka
 mbouchev\, L. Noels\, R. Radovitzky\, Nonlinear compressibility effects in
  fluid-structure interaction and their implications on the air-blast loadi
 ng of structures\, J. Appl. Phys. 100 (2006) 063519.\n[3] J. W. Hutchinson
 \, Energy and momentum transfer in air shocks\, ASME J. Appl. Mech. 76 (5)
  (2009) 051307.
LOCATION:Oatley Seminar Room\, Department of Engineering
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