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ERROR ESTIMATION AND ADAPTIVITY IN ELASTOPLASTICITY
Author(s) -
GALLIMARD L.,
LADEVÈZE P.,
PELLE J. P.
Publication year - 1996
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/(sici)1097-0207(19960130)39:2<189::aid-nme849>3.0.co;2-7
Subject(s) - estimator , discretization , finite element method , computation , discretization error , interval (graph theory) , algorithm , reliability (semiconductor) , computer science , mathematics , mathematical optimization , measure (data warehouse) , statistics , engineering , structural engineering , data mining , mathematical analysis , power (physics) , physics , combinatorics , quantum mechanics
In this paper, a method is developed to control the parameters of a finite element computation for time‐dependent material models. This method allows the user to obtain a prescribed accuracy with a computational cost as low as possible. To evaluate discretization errors, we use a global error measure in constitutive relation based on Drucker's inequality. This error includes, over the studied time interval, the error of the finite element model and the error of the algorithm being used. In order to master the size of the elements of the mesh and the length of the time increments, an error estimator, which permits estimating the errors due to the time discretization, is proposed. These tools are used to elaborate two procedures of adaptivity. Various examples for monotonous or non‐monotonous loadings, for 2‐D or axisymmetric problems, show the reliability of these procedures.