Ara es mostren els items 1-20 de 27

  • 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 ...
  • A framework for robustness assessment in the context of corroded RC structures 

    Cavaco, E. S.; Neves, L. A. C.; Casas Rius, Joan Ramon; Huespe, Alfredo Edmundo (CRC Press, 2010)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Structural robustness is an emergent concept related to the structural response to damage. At the present time, robustness is not well defined and much controversy still remains around this subject. Even if robustness has ...
  • A micromorphic model for steel fiber reinforced concrete 

    Oliver Olivella, Xavier; Mora Méndez, Diego Fernando; Huespe, Alfredo Edmundo; Weyler Pérez, Rafael (2012-10-15)
    Article
    Accés obert
    A new formulation to model the mechanical behavior of high performance fiber reinforced cement composites with arbitrarily oriented short fibers is presented. The formulation can be considered as a two scale approach, ...
  • A phase-field/gradient damage model for brittle fracture in elastic-plastic solids 

    Duda, Fernando P.; Ciarbonetti, A.; Sánchez, P.J.; Huespe, Alfredo Edmundo (2015-02)
    Article
    Accés obert
    The formulation of a phase-field continuum theory for brittle fracture in elastic-plastic solids and its computational implementation are presented in this contribution. The theory is based on a virtual-power formulation ...
  • A phase-field model for solute-assisted brittle fracture in elastic-plastic solids 

    Duda, Fernando P.; Ciarbonetti, Angel; Toro, Sebastian; Huespe, Alfredo Edmundo (2018-03)
    Article
    Accés restringit per política de l'editorial
    A phase-field theory of brittle fracture in elastoplastic solids hosting mobile interstitial solute species is developed in this paper. The theory, which is formulated within the framework of modern continuum mechanics, ...
  • A two-scale failure model for heterogeneous materials: numerical implementation based on the finite element method 

    Toro, Sebastian; Sánchez, Pablo J.; Huespe, Alfredo Edmundo; Giusti, Sebastian Miguel; Blanco, Pedro J.; Feijóo, R.A. (John Wiley & Sons, 2014-02)
    Article
    Accés obert
    In the first part of this contribution, a brief theoretical revision of the mechanical and variational foundations of a Failure-Oriented Multiscale Formulation (FOMF) devised for modeling failure in heterogeneous materials ...
  • Cohesive surface model for fracture based on a two-scale formulation: computational implementation aspects 

    Toro, Sebastian; Sánchez, P.J.; Podestá, J.M.; Blanco, P.J.; Huespe, Alfredo Edmundo; Feijóo, R.A. (2016-10)
    Article
    Accés obert
    The paper describes the computational aspects and numerical implementation of a two-scale cohesive surface methodology developed for analyzing fracture in heterogeneous materials with complex micro-structures. This approach ...
  • Computational material design for acoustic cloaking 

    Méndez, Carlos Alberto; Podestá, J.M.; Lloberas Valls, Oriol; Toro, Sebastian; Huespe, Alfredo Edmundo; Oliver Olivella, Xavier (John Wiley & Sons, 2017-12)
    Article
    Accés obert
    A topology optimization technique based on the topological derivative and the level set function is utilized to design/synthesize the micro-structure of a pentamode material for an acoustic cloaking device. The technique ...
  • Computational modeling of high-performance steel fiber reinforced concrete using a micromorphic approach 

    Huespe, Alfredo Edmundo; Oliver Olivella, Xavier; Mora, Diego Fernando (2013-12)
    Article
    Accés obert
    A finite element methodology for simulating the failure of high performance fiber reinforced concrete composites (HPFRC), with arbitrarily oriented short fibers, is presented. The composite material model is based on a ...
  • Continuum approach to computational multi-scale modeling of fracture 

    Oliver Olivella, Xavier; Caicedo Silva, Manuel Alejandro; Roubin, Emmanuel; Huespe, Alfredo Edmundo (2014-09-01)
    Article
    Accés obert
    This paper presents a FE2 multi-scale framework for numerical modeling of the structural failure of heterogeneous quasi-brittle materials. The model is assessed by application to cementitious materials. Using the Continuum ...
  • 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 ...
  • Control of heat flux using computationally designed metamaterials 

    Fachinotti, Víctor D.; Peralta, Ignacio; Huespe, Alfredo Edmundo; Ciarbonetti, A. (2016)
    Text en actes de congrés
    Accés obert
    To gain control over the diffusive heat flux in a given domain, one has to design metamaterials with a specifc distribution of the generally anisotropic thermal conductivity throughout the domain. Until now, the appropriate ...
  • Crack-path field and strain-injection techniques in computational modeling of propagating material failure 

    Oliver Olivella, Xavier; Dias, I.F.; Huespe, Alfredo Edmundo (2014-01)
    Article
    Accés obert
    The work presents two new numerical techniques devised for modeling propagating material failure, i.e. cracks in fracture mechanics or slip-lines in soil mechanics. The first one is termed crack-path-field technique and ...
  • Crack path field and strain injection techniques in dynamic fracture simulations 

    Lloberas Valls, Oriol; Huespe, Alfredo Edmundo; Oliver Olivella, Xavier; Dias, I.F. (2016)
    Text en actes de congrés
    Accés obert
    Dynamic fracture phenomena are studied employing low cost computational tools based on Finite Elements with Embedded strong discontinuities (E-FEM). Fracture nucleation and propagation are accounted for through the injection ...
  • 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 ...
  • High performance reduced order modeling techniques based on optimal energy quadrature: application to geometrically non-linear multiscale inelastic material modeling 

    Caicedo Silva, Manuel Alejandro; Mroginski, Javier L.; Toro, Sebastian; Raschi, Marcelo; Huespe, Alfredo Edmundo; Oliver Olivella, Xavier (2018-02)
    Article
    Accés restringit per política de l'editorial
    A High-Performance Reduced-Order Model (HPROM) technique, previously presented by the authors in the context of hierarchical multiscale models for non linear-materials undergoing infinitesimal strains, is generalized to ...
  • Material design of elastic structures using Voronoi cells 

    Podestá, J.M.; Méndez, C. G.; Toro, S.; Huespe, Alfredo Edmundo; Oliver Olivella, Xavier (John Wiley & sons, 2018-07)
    Article
    Accés restringit per política de l'editorial
    New tools for the design of metamaterials with periodic microarchitectures are presented. Initially, a two-scale material design approach is adopted. At the structure scale, the material effective properties and their ...
  • Model Order Reduction in computational multiscale fracture mechanics 

    Caicedo Silva, Manuel Alejandro; Oliver Olivella, Xavier; Huespe, Alfredo Edmundo; Lloberas Valls, Oriol (2016-09)
    Article
    Accés obert
    Nowadays, the model order reduction techniques have become an intensive research eld because of the increasing interest in the computational modeling of complex phenomena in multi-physic problems, and its conse- quent ...
  • 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 ...