Réponse d'une plaque couplée à un liquide et soumise à une pression mobile. Aspects théoriques et expérimentaux en détonique.

Abstract : The thesis studies the response of a flat plate coupled with a liquid and submitted to an expanding pressure field created by a detonation. A detonation is the most violent mode of explosion that creates a shock wave which generates a moving pressure with high levels of pressure and velocity. The main purpose is to investigate the dynamic response of the coupled system during the shock wave propagation. Once the detonation loading is recalled, the equations of motion are established. They are well adapted for fast dynamics imposed by the external loading. The plate equations are written according to the Mindlin Reissner assumptions. They can take into account the geometrical and material nonlinearities. The behaviour is based on the Prandtl-Reuss law with isotopic hardening. The fluid is described by the acoustic equations. The analytical study leads to the closed form solutions for the problem of an infinite strip lying on an infinite liquid domain and submitted to a moving constant level load. The stationary solutions represent the response of the coupled system. The numerical solutions for the real problem of a coupled plate are obtained using the second order finite differences method. The time integration of the equations is performed with an explicit scheme. The experimental set up is presented. Various examples of dynamic responses of plates in contact with water and submitted to detonations are compared to numerical solutions.
Document type :
Theses
Mechanics [physics.med-ph]. Université d'Orléans, 2006. French


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Submitted on : Thursday, September 7, 2006 - 4:44:03 PM
Last modification on : Thursday, September 7, 2006 - 4:52:08 PM

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  • HAL Id : tel-00091961, version 1

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Gregory Girault. Réponse d'une plaque couplée à un liquide et soumise à une pression mobile. Aspects théoriques et expérimentaux en détonique.. Mechanics [physics.med-ph]. Université d'Orléans, 2006. French. <tel-00091961>

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