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T. Janda, "Hypoplastic Model for Clays: Issues Specific to the Finite Element Implementation", in , (Editors), "Proceedings of the Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 193, 2013. doi:10.4203/ccp.102.193

Keywords: hypoplasticity, finite element implementation, clay, Runge-Kutta method, constitutive modeling, critical state.

Summary

This paper focuses on problems related to the implementation of the hypoplastic model for clays in the finite element method. Attention is first paid to the choice of the integration procedure of the stress-strain relation. Three adaptive Runge-Kutta methods of different orders are compared in terms of the efficiency, accuracy and sensitivity to the prescribed tolerance. The second topic covers the inability of the model to treat a zero stress state. In the actual finite element implementation this drawback is usually solved by maintaining the stress in the constitutive model shifted by a certain value when compared to the true stress expressed at the integration points. The influence of this stress offset on the accuracy of the predicted settlement is demonstrated on a simple problem of a vertically loaded flexible foundation placed on the terrain.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 102 PROCEEDINGS OF THE FOURTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: Paper 193 Hypoplastic Model for Clays: Issues Specific to the Finite Element Implementation T. Janda Department of Mechanics, Faculty of Civil Engineering Czech Technical University in Prague, Czech Republic doi:10.4203/ccp.102.193 purchase the full-text of this paper Full Bibliographic Reference for this paper T. Janda, "Hypoplastic Model for Clays: Issues Specific to the Finite Element Implementation", in , (Editors), "Proceedings of the Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 193, 2013. doi:10.4203/ccp.102.193 Keywords: hypoplasticity, finite element implementation, clay, Runge-Kutta method, constitutive modeling, critical state. Summary This paper focuses on problems related to the implementation of the hypoplastic model for clays in the finite element method. Attention is first paid to the choice of the integration procedure of the stress-strain relation. Three adaptive Runge-Kutta methods of different orders are compared in terms of the efficiency, accuracy and sensitivity to the prescribed tolerance. The second topic covers the inability of the model to treat a zero stress state. In the actual finite element implementation this drawback is usually solved by maintaining the stress in the constitutive model shifted by a certain value when compared to the true stress expressed at the integration points. The influence of this stress offset on the accuracy of the predicted settlement is demonstrated on a simple problem of a vertically loaded flexible foundation placed on the terrain. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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