The Frank tensor as a boundary condition in intrinsic linearized elasticity

Nicolas Van  Goethem

doi:10.3934/jgm.2016013

Article Contents

2016, Volume 8, Issue 4: 391-411. Doi: 10.3934/jgm.2016013

This issue Previous Article No monodromy in the champagne bottle, or singularities of a superintegrable system Next Article The Tulczyjew triple in mechanics on a Lie group

The Frank tensor as a boundary condition in intrinsic linearized elasticity

Nicolas Van Goethem^1,

1.
Universidade de Lisboa, Faculdade de Ciências, Departamento de Matemática, CMAF+CIO, Alameda da Universidade, C6, 1749-016 Lisboa

Received: November 30, 2015

Revised: August 31, 2016

Published: November 2016

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Abstract

The Frank tensor plays a crucial role in linear elasticity, and in particular in the presence of dislocation lines, since its curl is exactly the elastic strain incompatibility. Furthermore, the Frank tensor also appears in Cesaro decomposition, and in Volterra theory of dislocations and disclinations, since its jump is the Frank vector around the defect line. The purpose of this paper is to show to which functional space the compatible strain $e$ belongs in order to imply a homogeneous boundary conditions for the induced displacement field on a portion $\Gamma_0$ of the boundary. This will allow one to define the homogeneous, or even the mixed problem of linearized elasticity in a variational setting involving the strain $e$ in place of displacement $u$. With other purposes, this problem was originaly treated by Ph. Ciarlet and C. Mardare, and termed the intrinsic formulation. In this paper we propose alternative conditions on $e$ expressed in terms of $e$ and the Frank tensor Curl$^t$ $e$ only, yielding a clear physical understanding and showing as equivalent to Ciarlet-Mardare boundary condition.

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Mathematics Subject Classification: Primary: 35J48, 35J58; Secondary: 53A05, 74A45, 74B99.

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