15795 articles – 31782 references  [version française]
 HAL: hal-00654809, version 1
 Theoret. Appl. Mech. 38, 2 (2011) pp. 125-154,
 On some nonlinear inverse problems in elasticity
 Stephane Andrieux 1, H.D. Bui 1, 2
 (2011)
 In this paper, we make a review of some inverse problems in elasticity, in statics and dynamics, in acoustics, thermoelasticity and viscoelasticity. Crack inverse problems have been solved in closed form, by considering a nonlinear variational equation provided by the reciprocity gap functional. This equation involves the unknown geometry of the crack and the boundary data. It results from the symmetry lost between current fields and adjoint fields which is related to their support. The nonlinear equation is solved step by step by considering linear inverse problems. The normal to the crack plane, then the crack plane and finally the geometry of the crack, defined by the support of the crack displacement discontinuity, are determined explicitly. We also consider the problem of a volumetric defect viewed as the perturbation of a material constant in elastic solids which satisfies the nonlinear Calderon's equation. The nonlinear problem reduces to two successive ones: a source inverse problem and a Volterra integral equation of the first kind. The first problem provides information on the inclusion geometry. The second one provides the magnitude of the perturbation. The geometry of the defect in the nonlinear case is obtained in closed form and compared to the linearized Calderon's solution. Both geometries, in linearized and nonlinear cases, are found to be the same.
 1: Laboratoire de Mécanique des Structures Industrielles Durables (LAMSID) CNRS : UMR2832 – EDF 2: Laboratoire de mécanique des solides (LMS) CNRS : UMR7649 – Polytechnique - X – MINES ParisTech - École nationale supérieure des mines de Paris
 Subject : Physics/Mechanics/Mechanics of the solidesEngineering Sciences/Mechanics/Mechanics of the solides
 Keyword(s): Nonlinear fracture mechanics – symmetry loss – material constants perturbation – defect geometry.
 hal-00654809, version 1 http://hal.archives-ouvertes.fr/hal-00654809 oai:hal.archives-ouvertes.fr:hal-00654809 From: H. D. Bui <> Submitted on: Friday, 23 December 2011 09:24:04 Updated on: Friday, 23 December 2011 09:24:04