Space–time model order reduction for nonlinear viscoelastic systems subjected to long-term loading

Space–time model order reduction for nonlinear viscoelastic systems subjected to long-term loading The solution of nonlinear structural problems by means of a space–time model order reduction approach is investigated. The main target is the prediction of the long-term response while reducing both the computation time and the storage requirements considerably. A nonstandard discretization approach is used which treats the internal degrees of freedom as additional unknowns. The resulting nonlinear problem is formulated in a variational setting. The proposed reduced basis represents the behavior of the structure in a complete time interval, e.g. during one load cycle (for cyclic processes). The reduced variables are obtained by a projection of the time-local stationary conditions onto appropriate test functions defined in space–time. This leads to a low-dimensional nonlinear system of equations. Details regarding the theoretical derivation, the discretization and the numerical treatment of the nonlinearity are presented. In the numerical examples the reduced model is compared to FEM reference solutions. Different choices for the test functions are discussed and the postprocessing abilities offered by the reduced model are illustrated. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Meccanica Springer Journals

Space–time model order reduction for nonlinear viscoelastic systems subjected to long-term loading

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Publisher
Springer Netherlands
Copyright
Copyright © 2017 by Springer Science+Business Media B.V.
Subject
Physics; Classical Mechanics; Civil Engineering; Automotive Engineering; Mechanical Engineering
ISSN
0025-6455
eISSN
1572-9648
D.O.I.
10.1007/s11012-017-0734-x
Publisher site
See Article on Publisher Site

Abstract

The solution of nonlinear structural problems by means of a space–time model order reduction approach is investigated. The main target is the prediction of the long-term response while reducing both the computation time and the storage requirements considerably. A nonstandard discretization approach is used which treats the internal degrees of freedom as additional unknowns. The resulting nonlinear problem is formulated in a variational setting. The proposed reduced basis represents the behavior of the structure in a complete time interval, e.g. during one load cycle (for cyclic processes). The reduced variables are obtained by a projection of the time-local stationary conditions onto appropriate test functions defined in space–time. This leads to a low-dimensional nonlinear system of equations. Details regarding the theoretical derivation, the discretization and the numerical treatment of the nonlinearity are presented. In the numerical examples the reduced model is compared to FEM reference solutions. Different choices for the test functions are discussed and the postprocessing abilities offered by the reduced model are illustrated.

Journal

MeccanicaSpringer Journals

Published: Aug 8, 2017

References

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