Now showing items 1-16 of 16

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

      Lloberas Valls, Oriol; Rixen, Daniel J.; Simone, Angelo; Sluys, Lambertus J. (2009)
      Conference report
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      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 ...
    • Applications of domain decomposition techniques for the multiscale modeling of softening materials 

      Lloberas Valls, Oriol; Rixen, Daniel J.; Simone, Angelo; Sluys, Lambertus J. (2009)
      Conference report
      Open Access
      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 ...
    • Computational homogenization for multiscale crack modeling: implementational and computational aspects 

      Nguyen, Vinh Phu; Lloberas Valls, Oriol; Sluys, Lambertus J.; Stroeven, Martijn (John Wiley & sons, 2012-01)
      Article
      Open Access
      A computational homogenization procedure for cohesive and adhesive crack modeling of materials with a heterogeneous microstructure has been recently presented in Computer Methods in Applied Mechanics and Engineering (2010, ...
    • Concurrent multiscale analysis of heterogeneous materials 

      Lloberas Valls, Oriol; Everdij, Frank P. X.; Rixen, Daniel J.; Simone, Angelo; Sluys, Lambertus J. (Vienna University of Technology, 2012)
      Conference report
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      Concurrent multiscale analysis of quasi-brittle heterogeneous materials such as concrete and rock is conducted employing non-overlapping domain decomposition techniques. Initially, a coarse discretization with effective ...
    • Discrete element modeling approach to porosimetry for durability risk estimation of concrete 

      Stroeven, Piet; Le, Nghi L.B.; Stroeven, Martijn; Sluys, Lambertus J. (CIMNE, 2011)
      Conference report
      Open Access
      The paper introduces a novel approach to porosimetry in virtual concrete, denoted as random node structuring (RNS). The fresh state of this particulate material is producedby the DEM system HADES. Hydration simulation is ...
    • Domain decomposition and parallel direct solvers as an adaptive multiscale strategy for damage simulation in materials 

      Everdij, Frank P. X.; Lloberas Valls, Oriol; Simone, Angelo; Rixen, Daniel J.; Sluys, Lambertus J. (Springer, 2016)
      Conference report
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      Understanding physical phenomena of heterogeneous materials is an ongoing active research field in the structural design of buildings and roads. The failure analysis of quasi-brittle materials such as concrete is a particular ...
    • Enhanced domain decomposition techniques for the modeling of softening materials 

      Lloberas Valls, Oriol; Rixen, Daniel J.; Simone, Angelo; Sluys, Lambertus J.; Stroeven, Martijn (2009)
      Conference report
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      In this study a FETI: Finite Element Tearing and Interconnecting [1] technique is adopted and exploited for the efficient and accurate modeling of softening materials such as concrete and rock. A fie scale analysis in which ...
    • Homogenization-based multiscale crack modelling: from micro-diffusive damage to macro-cracks 

      Nguyen, Vinh Phu; Lloberas Valls, Oriol; Stroeven, Martijn; Sluys, Lambertus J. (2011-02)
      Article
      Open Access
      The existence of a representative volume element (RVE) for a class of quasi-brittle materials having a random heterogeneous microstructure in tensile, shear and mixed mode loading is demonstrated by deriving traction–separation ...
    • 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)
      Conference report
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      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)
      Conference report
      Open Access
      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 analysis of heterogeneous brittle materials using domain decomposition techniques 

      Lloberas Valls, Oriol; Rixen, Daniel J.; Simone, Angelo; Sluys, Lambertus J. (2010)
      Conference report
      Restricted access - publisher's policy
      In this contribution we present a multiscale framework for the analysis of brittle materials based on domain decomposition approaches. In particular, the FETI (Finite Element Tearing and Interconnecting) [1] method is ...
    • Objective multiscale analysis of random heterogeneous materials 

      Lloberas Valls, Oriol; Everdij, Frank P. X.; Rixen, Daniel J.; Simone, Angelo; Sluys, Lambertus J. (2013)
      Conference report
      Open Access
      The multiscale framework presented in [1, 2] is assessed in this contribution for a study of random heterogeneous materials. Results are compared to direct numerical simulations (DNS) and the sensitivity to user-defined ...
    • On micro-to-macro connections in strong coupling multiscale modeling of softening materials 

      Lloberas Valls, Oriol; Rixen, Daniel J.; Simone, Angelo; Sluys, Lambertus J. (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2011)
      Conference report
      Open Access
      In this contribution we describe a methodology for the multiscale analysis of heterogeneous quasi-brittle materials. The algorithm is based on the finite element tearing and interconnecting FETI [1] method cast in a ...
    • On the existence of representative volumes for softening quasi-brittle materials: a failure zone averaging scheme 

      Nguyen, Vinh Phu; Lloberas Valls, Oriol; Stroeven, Martijn; Sluys, Lambertus J. (2010-11)
      Article
      Open Access
      The concept of the representative volume element (RVE) for softening materials is revised in this contribution. It is demonstrated by means of numerical simulations that there exists a sample which is statistically ...
    • The concept of Representative Volume Elements for elastic, hardening and softening materials 

      Gitman, Inna M.; Askes, Harm; Sluys, Lambertus J.; Lloberas Valls, Oriol (2004)
      Conference report
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      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, ...
    • The role of domain decomposition techniques for the study of heterogeneous quasi-brittle materials 

      Lloberas Valls, Oriol; Rixen, Daniel J.; Simone, Angelo; Sluys, Lambertus J. (CRC Press, 2010)
      Conference report
      Restricted access - publisher's policy
      We focus on the analysis of fracture in quasi-brittle materials by exploiting the potential of domain decomposition techniques. More specifically, we restrict our attention to the FETI (Finite Element Tearing and ...