Now showing items 1-20 of 99

  • 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 computational multiscale homogenization framework accounting for inertial effects: application to acoustic metamaterials modelling 

    Roca Cazorla, David; Lloberas Valls, Oriol; Cante Terán, Juan Carlos; Oliver Olivella, Xavier (2018-03)
    Article
    Open Access
    A framework, based on an extended Hill–Mandel principle accounting for inertial effects (Multiscale Virtual Work principle), is developed for application to acoustic problems in the context of metamaterials modelling. The ...
  • A consistent characteristic length for smeared cracking models 

    Oliver Olivella, Xavier (John Wiley & sons, 1989-02)
    Article
    Restricted access - publisher's policy
    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 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 ...
  • Advanced numerical techniques for modeling tensile crack propagation in gravity dams 

    Dias, I.F.; Oliver Olivella, Xavier; Lemos, J.V.; Lloberas Valls, Oriol (Laboratório Nacional de Engenharia Civil, 2015)
    Conference report
    Open Access
    Cracks propagating deep inside gravity dams can seriously affect their structural safety. Due to the potential catastrophic scenarios associated to the collapse of large concrete dams, it is a fundamental issue to ...
  • A finite strain, finite band method for modeling ductile fracture 

    Huespe, Alfredo Edmundo; Needleman, Alan; Oliver Olivella, Xavier; Sánchez, Pedro J (2012-01)
    Article
    Open Access
    We present a finite deformation generalization of the finite thickness embedded discontinuity formulation presented in our previous paper [A.E. Huespe, A. Needleman, J. Oliver, P.J. Sánchez, A finite thickness band method ...
  • A finite thickness band method for ductile fracture analysis 

    Huespe, Alfredo Edmundo; Needleman, Alan; Oliver Olivella, Xavier; Sánchez, Pedro José (2009)
    Article
    Open Access
    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 macroscopic damage-plastic constitutive law for modeling quasi-brittle fracture and ductile behavior of concrete 

    Sánchez, P.J.; Huespe, Alfredo Edmundo; Oliver Olivella, Xavier; Díaz, G.; Sonzogni, Victorio Enrique (2012-04)
    Article
    Open Access
    A new phenomenological macroscopic constitutive model for the numerical simulation of quasi-brittle fracture and ductile concrete behavior, under general triaxial stress conditions, is presented. The model is particularly ...
  • 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
    Open Access
    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, ...
  • Análisis no lineal de tanques criogénicos bajo cargas térmicas 

    Oliver Olivella, Xavier; Oñate Ibáñez de Navarra, Eugenio; Peraire Guitart, Jaume; Chueca Castedo, Rosa Mariana (1985-04)
    Article
    Open Access
  • An analysis of strong discontinuities induced by strain-softening in rate-independent inelastic solids 

    Simó, Juan Carlos; Oliver Olivella, Xavier; Armero, Francisco (Springer, 1993-09)
    Article
    Restricted access - publisher's policy
    Ket qualitative features of solutions exhibiting strong discontinuities in rate-independent inelastic solids are identified and exploited in the design of a new class of finite element approximations. The analysis shows ...
  • A plastic-damage model for concrete 

    Lubliner, Jacob; Oliver Olivella, Xavier; Oller Martínez, Sergio Horacio; Oñate Ibáñez de Navarra, Eugenio (1989)
    Article
    Restricted access - publisher's policy
    In this paper a constitutive model based on an internal variable-formulation of plasticity theory for the non-linear analysis of concrete is presented. The model uses a new yield criterion which matches experimental data ...
  • A plasticity model for simulation of industrial powder compaction processes 

    Oliver Olivella, Xavier; Oller Martínez, Sergio Horacio; Cante Terán, Juan Carlos (1996-08)
    Article
    Restricted access - publisher's policy
    A constitutive model, based on large strain plasticity, for simulation of industrial powder compaction processes is presented. The elastic response is stated in terms of a hyperelastic model based on a hookean elastic free ...
  • A rate-dependent isotropic damage model for the seismic analysis of concrete dams 

    Cervera Ruiz, Miguel; Oliver Olivella, Xavier; Manzoli, Osvaldo (Wiley, 1996-09)
    Article
    Open Access
    In this paper a rate-dependent isotropic damage model developed for the numerical analysis of concrete dams subjected to seismic excitation is presented. The model is shown to incorporate two features essential for seismic ...
  • 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. ...
  • A sensibility analysis to geometric and cutting conditions using the particle finite element method (PFEM) 

    Rodriguez Prieto, Juan Manuel; Arrazola, Pedro; Cante Terán, Juan Carlos; Kortabarria, Arratibel; Oliver Olivella, Xavier (Red Hook, 2013)
    Conference report
    Open Access
    The (PFEM) is employed to simulate orthogonal metal cutting of 42CD4 steel. The objectives of this work are mainly three: The first one is to validate PFEM strategies as an efficient tool for numerical simulation of metal ...
  • A strain-based plastic viscous-damage model for massive concrete structures 

    Faria, R; Oliver Olivella, Xavier; Cervera Ruiz, Miguel (1998-05)
    Article
    Open Access
    Within the framework of continuum damage mechanics, a new constitutive damage model for massive concrete is presented, mainly intended for the seismic analysis of gravity and arch dams. Consistent with thermodynamic ...
  • A study on finite elements for capturing strong discontinuities 

    Oliver Olivella, Xavier; Huespe, Alfredo Edmundo; Samaniego Alvarado, Esteban (John Wiley & sons, 2003-04)
    Article
    Open Access
    The work focuses on the presently existing families of finite elements with embedded discontinuities and explores the possibilities of obtaining symmetric statically consistent finite elements that alleviate the stress-locking ...
  • Computational design of locally resonant acoustic metamaterials 

    Roca Cazorla, David; Yago Llamas, Daniel; Cante Terán, Juan Carlos; Lloberas Valls, Oriol; Oliver Olivella, Xavier (2019-03)
    Article
    Restricted access - publisher's policy
    The so-called Locally Resonant Acoustic Metamaterials (LRAM) are considered for the design of specifically engineered devices capable of stopping waves from propagating in certain frequency regions (bandgaps), this making ...