Injective weak solutions in second-gradient nonlinear elasticity

Timothy J. Healey; Stefan Krömer

ESAIM: Control, Optimisation and Calculus of Variations (2008)

  • Volume: 15, Issue: 4, page 863-871
  • ISSN: 1292-8119

Abstract

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We consider a class of second-gradient elasticity models for which the internal potential energy is taken as the sum of a convex function of the second gradient of the deformation and a general function of the gradient. However, in consonance with classical nonlinear elasticity, the latter is assumed to grow unboundedly as the determinant of the gradient approaches zero. While the existence of a minimizer is routine, the existence of weak solutions is not, and we focus our efforts on that question here. In particular, we demonstrate that the determinant of the gradient of any admissible deformation with finite energy is strictly positive on the closure of the domain. With this in hand, Gâteaux differentiability of the potential energy at a minimizer is automatic, yielding the existence of a weak solution. We indicate how our results hold for a general class of boundary value problems, including “mixed” boundary conditions. For each of the two possible pure displacement formulations (in second-gradient problems), we show that the resulting deformation is an injective mapping, whenever the imposed placement on the boundary is itself the trace of an injective map.

How to cite

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Healey, Timothy J., and Krömer, Stefan. "Injective weak solutions in second-gradient nonlinear elasticity." ESAIM: Control, Optimisation and Calculus of Variations 15.4 (2008): 863-871. <http://eudml.org/doc/90941>.

@article{Healey2008,
abstract = { We consider a class of second-gradient elasticity models for which the internal potential energy is taken as the sum of a convex function of the second gradient of the deformation and a general function of the gradient. However, in consonance with classical nonlinear elasticity, the latter is assumed to grow unboundedly as the determinant of the gradient approaches zero. While the existence of a minimizer is routine, the existence of weak solutions is not, and we focus our efforts on that question here. In particular, we demonstrate that the determinant of the gradient of any admissible deformation with finite energy is strictly positive on the closure of the domain. With this in hand, Gâteaux differentiability of the potential energy at a minimizer is automatic, yielding the existence of a weak solution. We indicate how our results hold for a general class of boundary value problems, including “mixed” boundary conditions. For each of the two possible pure displacement formulations (in second-gradient problems), we show that the resulting deformation is an injective mapping, whenever the imposed placement on the boundary is itself the trace of an injective map. },
author = {Healey, Timothy J., Krömer, Stefan},
journal = {ESAIM: Control, Optimisation and Calculus of Variations},
keywords = {Gradient estimate; injective deformations; Euler-Lagrange equation; nonlinear elasticity; gradient estimate},
language = {eng},
month = {7},
number = {4},
pages = {863-871},
publisher = {EDP Sciences},
title = {Injective weak solutions in second-gradient nonlinear elasticity},
url = {http://eudml.org/doc/90941},
volume = {15},
year = {2008},
}

TY - JOUR
AU - Healey, Timothy J.
AU - Krömer, Stefan
TI - Injective weak solutions in second-gradient nonlinear elasticity
JO - ESAIM: Control, Optimisation and Calculus of Variations
DA - 2008/7//
PB - EDP Sciences
VL - 15
IS - 4
SP - 863
EP - 871
AB - We consider a class of second-gradient elasticity models for which the internal potential energy is taken as the sum of a convex function of the second gradient of the deformation and a general function of the gradient. However, in consonance with classical nonlinear elasticity, the latter is assumed to grow unboundedly as the determinant of the gradient approaches zero. While the existence of a minimizer is routine, the existence of weak solutions is not, and we focus our efforts on that question here. In particular, we demonstrate that the determinant of the gradient of any admissible deformation with finite energy is strictly positive on the closure of the domain. With this in hand, Gâteaux differentiability of the potential energy at a minimizer is automatic, yielding the existence of a weak solution. We indicate how our results hold for a general class of boundary value problems, including “mixed” boundary conditions. For each of the two possible pure displacement formulations (in second-gradient problems), we show that the resulting deformation is an injective mapping, whenever the imposed placement on the boundary is itself the trace of an injective map.
LA - eng
KW - Gradient estimate; injective deformations; Euler-Lagrange equation; nonlinear elasticity; gradient estimate
UR - http://eudml.org/doc/90941
ER -

References

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