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Theses

Application de méthodes inverses au dépouillement de l'essai aux barres de Hopkinson.

Abstract : The aim of the present work is the optimisation of the analysis of the split Hopkinson pressure bar Test in cases where the c1assical method cannot apply. The c1assical assumption is the equilibrium of forces acting on by the specimen during the loading. In this case he behaviour can be given as a stress - strain curve because of the similarity with the quasi-static case and the assumption of homogeneity of mechanical fields in the specimen~. However the assumption of equilibrium is not verified for any test. As a consequence, in these' Situations the specimen must be considered as a structure, taking account of inertial effects, and no longer an element of matter and one has to find the specimen's behaviour through the forces and the velocities' measured on ifs faces during the experiment. This is an inverse problem for which the information lies in the duality of the given boundary conditions. A solution is proposed for the generalized inverse problem: determine the behaviour of a structure with both forces and velocities given on the boundary as function-; of time. The presented method provides a solution for the considered ill-posed problem (and toll near problems like Cauca' of the evolution of a structure. The construction of this s' . asked upon t' compatibility gap developped and discussed in this work.
Mots-clés : Barres de Hopkinson
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https://pastel.archives-ouvertes.fr/pastel-00000895
Contributor : Ecole Polytechnique <>
Submitted on : Friday, July 30, 2010 - 1:32:58 PM
Last modification on : Thursday, September 24, 2020 - 4:00:21 PM
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  • HAL Id : pastel-00000895, version 1

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Laurent Rota. Application de méthodes inverses au dépouillement de l'essai aux barres de Hopkinson.. Sciences de l'ingénieur [physics]. Ecole Polytechnique X, 1997. Français. ⟨pastel-00000895⟩

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