Ara es mostren els items 1-20 de 25

    • 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)
      Llibre
      Accés obert
      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
      Accés restringit per política de l'editorial
      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
      Accés restringit per política de l'editorial
      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
      Accés obert
      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
      Accés restringit per política de l'editorial
      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. ...
    • CECM: a continuous empirical cubature method with application to the dimensional hyperreduction of parameterized finite element models 

      Hernández Ortega, Joaquín Alberto; Bravo Martínez, José Raúl; Ares de Parga Regalado, Sebastian (Elsevier, 2024-01)
      Article
      Accés obert
      We propose a method for finding optimal quadrature/cubature rules with positive weights for parameterized functions in 1D, 2D or 3D spatial domains. The method takes as starting point the values of the functions at the ...
    • 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
      Accés obert
      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
      Accés obert
      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 ...
    • Empirical Interscale Finite Element Method (EIFEM) for modeling heterogeneous structures via localized hyperreduction 

      Hernández Ortega, Joaquín Alberto; Giuliodori Picco, Agustina; Soudah Prieto, Eduardo (Elsevier, 2024-01)
      Article
      Accés obert
      This work proposes a special type of Finite Element (FE) technology – the Empirical Interscale FE method – for modeling heterogeneous structures in the small strain regime, for both dynamic and static analyses. The method ...
    • 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
      Accés obert
      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)
      Llibre
      Accés obert
      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
      Accés obert
      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 ...
    • Hyper-reduction for Petrov–Galerkin reduced order models 

      Ares de Parga Regalado, Sebastian; Bravo Martínez, José Raúl; Hernández Ortega, Joaquín Alberto; Zorrilla Martínez, Rubén; Rossi, Riccardo (Elsevier, 2023-11)
      Article
      Accés restringit per política de l'editorial
      Projection-based Reduced Order Models are based on the idea of minimizing the discrete residual of a “full order model” (FOM) while at the same time constraining the unknowns to live in a space of reduced dimension. For ...
    • 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)
      Text en actes de congrés
      Accés obert
      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 ...
    • Multiscale modeling of prismatic heterogeneous structures based on a localized hyperreduced-order method 

      Giuliodori Picco, Agustina; Hernández Ortega, Joaquín Alberto; Soudah Prieto, Eduardo (2023-03)
      Article
      Accés obert
      This work aims at deriving special types of one-dimensional Finite Elements (1D FE) for efficiently modeling heterogeneous prismatic structures, in the small strains regime, by means of reduced-order modeling (ROM) and ...
    • 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)
      Capítol de llibre
      Accés restringit per política de l'editorial
      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 bare and polymer-covered braided stents using torsional and tensile springs connectors 

      Giuliodori Picco, Agustina; Hernández Ortega, Joaquín Alberto; Fernández Sánchez, David; Galve, Iñaki; Soudah Prieto, Eduardo (2021-06)
      Article
      Accés obert
      Computational modeling of braided stents using the finite element (FE) method has become an essential tool in the design and development of these medical devices. One of the most challenging issues in such a task is ...
    • 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
      Accés obert
      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)
      Llibre
      Accés obert
      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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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 ...