DSpace DSpace UPC
 Català   Castellano   English  

E-prints UPC >
Altres >
Enviament des de DRAC >

Empreu aquest identificador per citar o enllaçar aquest ítem: http://hdl.handle.net/2117/9634

Arxiu Descripció MidaFormat
2009 COMPLASX Samat at al hyperplastic p659.pdfArticle233,48 kBAdobe PDFThumbnail
Veure/Obrir

Citació: Samat, S.; Vaunat, J.; Gens, A. An interior - point algorithm for hyper-plastic models for soils. A: International Conference on Computational Plasticity. "X International Conference on Computational Plasticity". Barcelona: 2009, p. 1-4.
Títol: An interior - point algorithm for hyper-plastic models for soils
Autor: Samat, Sergio; Vaunat, Jean Veure Producció científica UPC; Gens Solé, Antonio Veure Producció científica UPC
Data: 2009
Tipus de document: Conference report
Resum: In numerical analysis of geotechnical problems it is often necessary to use sophisticated elastoplastic constitutive models. Particularly, the presence of friction as the fundamental mechanism to dissipate energy provides most of the models used in this field with a non-associated character. This characteristic introduces theoretical and numerical complexity at time of deriving the models from thermo-mechanical principles and implementing them. The paper presents the formulation and implementation for a family of non-associated models based on the hyper-plasticity approach. The paper starts with the hyper-plastic framework, that proves to be a powerful technique to derive evolution equations using standard thermo-mechanical procedures based on the differentiation of the energy expressions (free Helmholtz energy fs, Gibbs energy gs, and dissipation d), even for non-associated laws. The characterization of the variational structure behind the discrete equations of the Interior-Point projection of approximation is discussed in the second part. Thirdly is described the implementation of the models using convex programming theory. The integration of the incremental response is achieved following a classical primal-dual interior-point algorithm which presents good performance to resolve saddle-point problems. This algorithm has the particularity to solve the optimality conditions associated with a suitably penalized mathematical program taking Newton steps or damped Newton steps toward points on the central path or quasi-central path previously de ned. The global convergence characteristic of the algorithm is achieved introducing an appropriate line search scheme. The algorithm is finally tested on initial-boundary-value problem for an elastoplastic continuum of Cam clay type. The performance of the algorithm is discussed on the basis of the results obtained.
ISBN: 978-84-96736-69-6
URI: http://hdl.handle.net/2117/9634
Apareix a les col·leccions:MSR - Mecànica del Sòls i de les Roques. Ponències/Comunicacions de congressos
ETCG – Departament d’Enginyeria del Terreny, Cartogràfica i Geofísica. Ponències/Comunicacions de congressos
Altres. Enviament des de DRAC
Comparteix:


Stats Mostra les estadístiques d'aquest ítem

SFX Query

Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i industrial corresponents. Sense perjudici de les exempcions legals existents, queda prohibida la seva reproducció, distribució, comunicació pública o transformació sense l'autorització del titular dels drets.

Per a qualsevol ús que se'n vulgui fer no previst a la llei, dirigiu-vos a: sepi.bupc@upc.edu

 

Valid XHTML 1.0! Programari DSpace Copyright © 2002-2004 MIT and Hewlett-Packard Comentaris
Universitat Politècnica de Catalunya. Servei de Biblioteques, Publicacions i Arxius