We propose two different Lagrange multiplier methods for contact problems derived from the augmented Lagrangian variational formulation. Both the obstacle problem, where a constraint on the solution is imposed in the bulk domain and the Signorini problem, where a lateral contact condition is imposed are considered. We consider both continuous and discontinuous approximation spaces for the Lagrange multiplier. In the latter case the method is unstable and a penalty on the jump of the multiplier must be applied for stability. We prove the existence and uniqueness of discrete solutions, best approximation estimates and convergence estimates that are optimal compared to the regularity of the solution.
Accepté le :
DOI : 10.1051/m2an/2018047
Mots-clés : Signorini problem, obstacle problem, finite element method, Lagrange mutlipliers, augmented Lagrangian, error estimates
@article{M2AN_2019__53_1_173_0, author = {Burman, Erik and Hansbo, Peter and Larson, Mats G.}, title = {Augmented {Lagrangian} finite element methods for contact problems}, journal = {ESAIM: Mathematical Modelling and Numerical Analysis }, pages = {173--195}, publisher = {EDP-Sciences}, volume = {53}, number = {1}, year = {2019}, doi = {10.1051/m2an/2018047}, mrnumber = {3937350}, zbl = {1422.65374}, language = {en}, url = {http://www.numdam.org/articles/10.1051/m2an/2018047/} }
TY - JOUR AU - Burman, Erik AU - Hansbo, Peter AU - Larson, Mats G. TI - Augmented Lagrangian finite element methods for contact problems JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 2019 SP - 173 EP - 195 VL - 53 IS - 1 PB - EDP-Sciences UR - http://www.numdam.org/articles/10.1051/m2an/2018047/ DO - 10.1051/m2an/2018047 LA - en ID - M2AN_2019__53_1_173_0 ER -
%0 Journal Article %A Burman, Erik %A Hansbo, Peter %A Larson, Mats G. %T Augmented Lagrangian finite element methods for contact problems %J ESAIM: Mathematical Modelling and Numerical Analysis %D 2019 %P 173-195 %V 53 %N 1 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/m2an/2018047/ %R 10.1051/m2an/2018047 %G en %F M2AN_2019__53_1_173_0
Burman, Erik; Hansbo, Peter; Larson, Mats G. Augmented Lagrangian finite element methods for contact problems. ESAIM: Mathematical Modelling and Numerical Analysis , Tome 53 (2019) no. 1, pp. 173-195. doi : 10.1051/m2an/2018047. http://www.numdam.org/articles/10.1051/m2an/2018047/
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