Exploració per tema "Materials -- Models matemàtics"

Ara es mostren els items 1-12 de 12

    • A consistent characteristic length for smeared cracking models 

      Oliver Olivella, Xavier (John Wiley & sons, 1989-02)
      Article
      Accés restringit per política de l'editorial
      A numerical scheme for crack modelling by means of continuous displacement fields is presented. In two-dimensional problems a crack is modelled as a limiting case of two singular lines (with continuous displacements, but ...

    • A domain decomposition approach to multiscale analysis for structures with softening materials 

      Lloberas Valls, Oriol; Rixen, Daniel J.; Simone, Angelo; Sluys, Lambertus J. (2009)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this contribution we present a domain decomposition framework for the multiscale analysis of softening materials. In particular we focus on the finite element tearing and interconnecting (FETI) technique implemented in ...

    • A finite thickness band method for ductile fracture analysis 

      Huespe, Alfredo Edmundo; Needleman, Alan; Oliver Olivella, Xavier; Sánchez, Pedro José (2009)
      Article
      Accés obert
      We present a finite element method with a finite thickness embedded weak discontinuity to analyze ductile fracture problems. The formulation is restricted to small geometry changes. The material response is characterized ...

    • An axisymmetric PFEM formulation for bottle forming simulation 

      Ryzhakov, Pavel (Springer, 2017-01)
      Article
      Accés obert
      A numerical model for bottle forming simulation is proposed. It is based upon the Particle Finite Element Method (PFEM) and is developed for the simulation of bottles characterized by rotational symmetry. The PFEM strategy ...

    • Applications of domain decomposition techniques for the multiscale modeling of softening materials 

      Lloberas Valls, Oriol; Rixen, Daniel J.; Simone, Angelo; Sluys, Lambertus J. (2009)
      Text en actes de congrés
      Accés obert
      In this contribution we describe a methodology for the study of softening brittle materials at different scales of observation. The goal is to account for a higher resolution at those areas that undergo the non-linear ...

    • Comparative study of different discrete element models and evaluation of equivalent micromechanical parameters 

      Rojek, Jerzy; Labra, C.; Su, O.; Oñate Ibáñez de Navarra, Eugenio (2012-06)
      Article
      Accés obert
      Comparative studies of different discrete element models of a rock-type material are presented. The discrete element formulation employs spherical particles with the cohesive interaction model combining linear elastic ...

    • Multi-scale modeling of softening materials 

      Lloberas Valls, Oriol; Simone, Angelo; Sluys, Lambertus J. (International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), 2008)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents an assessment of a two-scale framework for the study of softening materials such as concrete. The procedure is based on a hierarchical Finite Element (FE) scheme in which computations are performed both ...

    • Multiscale analysis of damage using dual and primal domain decomposition techniques 

      Lloberas Valls, Oriol; Everdij, Frank P. X.; Rixen, Daniel J.; Simone, Angelo; Sluys, Lambertus J. (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2014)
      Text en actes de congrés
      Accés obert
      In this contribution, dual and primal domain decomposition techniques are studied for the multiscale analysis of failure in quasi-brittle materials. The multiscale strategy essentially consists in decomposing the structure ...

    • Multiscale computational homogenization 

      Otero Gruer, Fermín Enrique; Oller Martínez, Sergio Horacio; Martínez García, Javier (Centro de Investigación en Matemáticas, 2017)
      Capítol de llibre
      Accés restringit per política de l'editorial

    • Phase-2 reentry in cardiac tissue: role of the slow calcium pulse 

      Rodríguez Cantalapiedra, Inma; Peñaranda Ayllón, Angelina; Echebarría Domínguez, Blas; Bragard, Jean (2010-07-13)
      Article
      Accés obert
      Phase-2 re-entry is thought to underlie many causes of idiopathic ventricular arrhythmias as, for instance, those occurring in Brugada syndrome. In this paper, we study under which circumstances a region of depolarized tissue ...

    • Study of the utilization of model order reduction in the multiscale analysis of composite lattice structures 

      Núñez Labiella, Alejandro (Universitat Politècnica de Catalunya, 2014-06)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      The study and implementation of the algorithm to solve non-linear bar is presented.This implemented algorithm is used for the study of the multiscale analysis of trusseswith non-linear bar. On the other hand, it is presented ...

    • The concept of Representative Volume Elements for elastic, hardening and softening materials 

      Gitman, Inna M.; Askes, Harm; Sluys, Lambertus J.; Lloberas Valls, Oriol (2004)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The concept of the Representative Volume Element (RVE) is analysed in the present paper. For elastic materials, one can determine the size of the RVE. However, for other applications, such as the case of softening materials, ...