Now showing items 1-20 of 20

    • A comparative study on homogenization strategies for multi-scale analysis of materials 

      Ortolano González, José María; Hernández Ortega, Joaquín Alberto; Oliver Olivella, Xavier (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2013-02-01)
      Book
      Open Access
      One of the most important engineering tasks over the years has been the design and manufacture of increasingly sophisticated structural materials as a result of the requirements related to the technological progress. In ...
    • A contact domain method for large deformation frictional contact problems. Part 1: Theoretical basis 

      Oliver Olivella, Xavier; Hartmann, S; Cante Terán, Juan Carlos; Weyler Pérez, Rafael; Hernández Ortega, Joaquín Alberto (2009-03)
      Article
      Restricted access - publisher's policy
      In the first part of this work, the theoretical basis of a frictional contact domain method for two-dimensional large deformation problems is presented. Most of the existing contact formulations impose the contact constraints ...
    • A contact domain method for large deformation frictional contact problems. Part 2: Numerical aspects 

      Hartmann, S.; Oliver Olivella, Xavier; Weyler Pérez, Rafael; Cante Terán, Juan Carlos; Hernández Ortega, Joaquín Alberto (2009)
      Article
      Restricted access - publisher's policy
      This second part of the work describes the numerical aspects of the developed contact domain method for large deformation frictional contact problems. The theoretical basis of this contact method is detailed in the first ...
    • A multiscale method for periodic structures using domain decomposition and ECM-hyperreduction 

      Hernández Ortega, Joaquín Alberto (2020-08-15)
      Article
      Restricted access - publisher's policy
      This paper presents a nonlinear multiscale approach for periodic structures in the quasi-static, small strain regime. The approach consists in combining a domain decomposition method in which interface conditions are ...
    • A robust approach to model densification and crack formation in powder compaction processes 

      Hernández Ortega, Joaquín Alberto; Oliver Olivella, Xavier; Cante Terán, Juan Carlos; Weyler Pérez, Rafael (Wiley and Sons, 2011-08-26)
      Article
      Restricted access - publisher's policy
      This paper deals with the question of how to efficiently integrate a constitutive model that describes the densification of powders and the potential formation of cracks in Powder Metallurgy (P/M) cold compaction processes. ...
    • Continuum approach to computational multiscale modeling of propagating fracture 

      Oliver Olivella, Xavier; Caicedo Silva, Manuel Alejandro; Roubin, Emmanuel; Huespe, Alfredo Edmundo; Hernández Ortega, Joaquín Alberto (2015-09)
      Article
      Open Access
      A new approach to two-scale modeling of propagating fracture, based on computational homogenization (FE2), is presented. The specific features of the approach are: a) a continuum setting for representation of the fracture ...
    • Dimensional hyper-reduction of nonlinear finite element models via empirical cubature 

      Hernández Ortega, Joaquín Alberto; Caicedo Silva, Manuel Alejandro; Ferrer Ferré, Àlex (2017-01)
      Article
      Open Access
      We present a general framework for the dimensional reduction, in terms of number of degrees of freedom as well as number of integration points (“hyper-reduction”), of nonlinear parameterized finite element (FE) models. The ...
    • Finite element modelling of ejection cracks in powder metallurgy die compaction processes: case study 

      Hernández Ortega, Joaquín Alberto; Oliver Olivella, Xavier; Cante Terán, Juan Carlos; Weyler Pérez, Rafael (2012)
      Article
      Open Access
      To date, the modelling of crack formation during the ejection stage in powder metallurgy die compaction processes has fallen outside the scope of conventional finite element studies on this process. In this paper, we attempt ...
    • High-performance model reduction procedures in multiscale simulations 

      Hernández Ortega, Joaquín Alberto; Oliver Olivella, Xavier; Huespe, Alfredo Edmundo; Caicedo, Manuel Alejandro (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2012-03-01)
      Book
      Open Access
      Technological progress and discovery and mastery of increasingly sophisticated structural materials have been inexorably tied together since the dawn of history. In the present era — the so-called Space Age —-, the prevailing ...
    • High-performance model reduction techniques in computational multiscale homogenization 

      Hernández Ortega, Joaquín Alberto; Oliver Olivella, Xavier; Huespe, Alfredo Edmundo; Caicedo Silva, Manuel Alejandro; Cante Terán, Juan Carlos (2014-07-01)
      Article
      Open Access
      A novel model-order reduction technique for the solution of the fine-scale equilibrium problem appearing in computational homogenization is presented. The reduced set of empirical shape functions is obtained using a ...
    • Multi-scale (FE2) analysis of material failure in cement/aggregate-type composite structures 

      Oliver Olivella, Xavier; Caicedo, Manuel Alejandro; Roubin, Emmanuel; Hernández Ortega, Joaquín Alberto; Huespe, Alfredo Edmundo (CRC, 2014)
      Conference report
      Open Access
      The work propases a FP multiscale approach to computational modeling of material failure in concreteMlike structures, made of cement/aggregate-type composite materials. Keeping the approach in a classical homogenization ...
    • Numerical methods 

      Agelet de Saracibar Bosch, Carlos; Boman, Romain; Bussetta, Philippe; Cajas García, Juan Carlos; Cervera Ruiz, Miguel; Chiumenti, Michele; Coll Sans, Abel; Dadvand, Pooyan; Hernández Ortega, Joaquín Alberto; Houzeaux, Guillaume; Pasenau de Riera, Miguel; Ponthot, Jean Philippe (Wiley, 2016)
      Part of book or chapter of book
      Restricted access - publisher's policy
      As one of the results of an ambitious project, this handbook provides a well-structured directory of globally available software tools in the area of Integrated Computational Materials Engineering (ICME). The compilation ...
    • Numerical modeling of crack formation in powder forming processes 

      Hernández Ortega, Joaquín Alberto; Oliver Olivella, Xavier; Cante Terán, Juan Carlos; Weyler Pérez, Rafael (2011-01)
      Article
      Open Access
      This paper presents a constitutive model describing the mechanical behavior of metal powders during (uniaxial) cold die compaction processes, placing special emphasis on the modeling of cracks formed during the ejection ...
    • Numerical modeling of crack formation in power compaction processes 

      Hernández Ortega, Joaquín Alberto; Oliver Olivella, Xavier; Cante Terán, Juan Carlos (Universitat Politècnica de Catalunya. Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2009)
      Book
      Open Access
      Powder metallurgy (P/M) is an important technique of manufacturing metal parts from metal in powdered form. Traditionally, P/M processes and products have been designed and developed on the basis of practical rules and ...
    • On particle finite element methods (PFEM) in dynamic solid mechanics problems 

      Oliver Olivella, Xavier; Cante Terán, Juan Carlos; Weyler Pérez, Rafael; Hartmann, S.; Hernández Ortega, Joaquín Alberto (2009)
      Conference report
      Restricted access - publisher's policy
      The work presents the most relevant features of a numerical simulation setting based on the Particle Finite Element Method. The method is especially suitable for dynamic problems in computational solid mechanics where a ...
    • On the numerical modeling of granular material flows via the Particle Finite Element Method (PFEM) 

      Dávalos, César; Cante Terán, Juan Carlos; Hernández Ortega, Joaquín Alberto; Oliver Olivella, Xavier (2015-10)
      Article
      Open Access
      The aim of this work is to describe a numerical framework for reliably and robustly simulating the different kinematic conditions exhibited by granular materials while spreading ---from a stagnant condition, when the ...
    • On the proper characterization of tooling motions and initial conditions in powder die compaction modeling 

      Hernández Ortega, Joaquín Alberto; Cante Terán, Juan Carlos; Oliver Olivella, Xavier; Weyler Pérez, Rafael (2011-08)
      Article
      Open Access
      The present paper is concerned with the finite element modeling of Powder Metallurgy (P/M) cold die compaction process. Rather than on material constitutive theories or on numerical algorithmic issues, attention is confined ...
    • PFEM-based modeling of industrial granular flows 

      Cante Terán, Juan Carlos; Dávalos Chargoy, César Emilio; Hernández Ortega, Joaquín Alberto; Oliver Olivella, Xavier; Jonsén, P.; Gustafsson, G.; Häggblad, H.-Å. (2014-05)
      Article
      Open Access
      The potential of numerical methods for the solution and optimization of industrial granular flows problems is widely accepted by the industries of this field, the challenge being to promote effectively their industrial ...
    • Reduced order modeling strategies for computational multiscale fracture 

      Oliver Olivella, Xavier; Caicedo Silva, Manuel Alejandro; Huespe, Alfredo Edmundo; Hernández Ortega, Joaquín Alberto; Roubin, Emmanuel (2017-01)
      Article
      Open Access
      The paper proposes some new computational strategies for affordably solving multiscale fracture problems through a FE2 approach. To take into account the mechanical effects induced by fracture at the microstructure level ...
    • Two-scale topology optimization in computational material design: an integrated approach 

      Ferrer Ferré, Àlex; Cante Terán, Juan Carlos; Hernández Ortega, Joaquín Alberto; Oliver Olivella, Xavier (John Wiley & Sons, 2018-04)
      Article
      Open Access
      In this work, a new strategy for solving multiscale topology optimization problems is presented. An alternate direction algorithm and a precomputed offline microstructure database (Computational Vademecum) are used to ...