Time homogenization for clays subjected to large numbers of cycles
| Autor: | Pierre-Yves Hicher, Aurélie Papon, Zhen-Yu Yin, Yvon Riou |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
business.industry Bubble 0211 other engineering and technologies Computational Mechanics 02 engineering and technology Structural engineering Plasticity Physics::Classical Physics Geotechnical Engineering and Engineering Geology Triaxial shear test Homogenization (chemistry) Finite element method Physics::Geophysics Pressuremeter test Nonlinear system 020303 mechanical engineering & transports 0203 mechanical engineering Creep Mechanics of Materials General Materials Science business 021101 geological & geomatics engineering |
| Zdroj: | International Journal for Numerical and Analytical Methods in Geomechanics. 37:1470-1491 |
| ISSN: | 0363-9061 |
| DOI: | 10.1002/nag.2092 |
| Popis: | This paper discusses the reliability and the efficiency of a time homogenization method employed to reduce the computational time during cyclic loading for two common geotechnical tests and two elastoplastic models for clays. The method of homogenization is based upon splitting time into two separate scales. The first time scale relates to the period of cyclic loading and the second to the characteristic time of the fatigue phenomenon. The time homogenization method is applied to simulate an undrained triaxial test (homogeneous stress state) and a pressuremeter test (nonhomogeneous stress state) under one-way cyclic loading on normally consolidated clay. This method is coupled with two elastoplastic models dedicated to cyclic behavior of clay (a bounding surface plasticity model and a bubble model). Both linear and nonlinear elasticities are considered. The difficulty encountered when applying this method to models introducing nonlinear elasticity and kinematic hardening is pointed out. The performance of time homogenization related to the main parameters is numerically investigated by comparison with conventional finite element simulations. |
| Databáze: | OpenAIRE |
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