Now showing items 1-20 of 135

    • 3D zero-thickness interface model for fracture of cement-based materials with chemical degradation 

      Martínez Estévez, Ariadna; Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (2022-03)
      Article
      Open Access
      In the framework of the Finite Element Method, zero-thickness interface elements have been widely used to model fracturing processes in quasi-brittle materials in a broad variety of problems. In particular, interface ...
    • A blended shifted-fracture/phase-field framework for sharp/diffuse crack modeling 

      Li, Kangan; Rodríguez Ferran, Antonio; Scovazzi, Guglielmo (2023-02-28)
      Article
      Open Access
      The shifted fracture method (SFM) is an embedded method that enables sharp crack representations while using mesh-fitted data structures. In the SFM, the true crack is embedded in the computational grid, but the crack ...
    • A comparative review of XFEM, mixed FEM and phase-field models for quasi-brittle cracking 

      Cervera Ruiz, Miguel; Barbat Vlad, Gabriel; Chiumenti, Michele; Wu, Jian-Ying (2022-03)
      Article
      Restricted access - publisher's policy
      In this work, a critical comparison between three different numerical approaches for the computational modelling of quasi-brittle structural failure is presented. Among the many finite element approaches devised to solve ...
    • A comparison of the state of the art models for constitutive modelling of concrete 

      Caner, Ferhun Cem (2021-02-01)
      Article
      Open Access
      Concrete is undoubtedly the most important and widely used construction material of the last centuries. Nevertheless, mathematical models that can accurately capture the particular material behaviour under all loading ...
    • A continuous damage model to mimic sharp cracks in quasi-brittle materials 

      Casado-Antolin, Montserrat (Universitat Politècnica de Catalunya, 2018-06)
      Master thesis
      Open Access
      A usual trick in various modelling approaches for computational fracture (i.e. damage models, phase-field approaches) is to include an artificial residual stiffness. This is done to avoid singularity of the tangent stiffness ...
    • A continuous-discontinuous model for crack branching 

      Tamayo Mas, Elena; Feliu Fabà, Jordi; Casado Antolín, Montserrat; Rodríguez Ferran, Antonio (John Wiley & sons, 2019-10-05)
      Article
      Open Access
      A new continuous-discontinuous model for fracture that accounts for crack branching in a natural manner is presented. It combines a gradient-enhanced damage model based on nonlocal displacements to describe diffuse cracks ...
    • A continuous-discontinuous model to introduce fluid pressure in a crack. 

      Casado Antolín, Montserrat (Universitat Politècnica de Catalunya, 2016-07-14)
      Bachelor thesis
      Open Access
      Cracking of quasi-brittle materials (such as concrete, rocks,) may be modelled by means of continuous, discontinuous or continuous-discontinuous models. The latter combine a continuous damage model for the initial stages ...
    • A continuous-discontinusous model to simulate crack branching in quasi-brittle failure 

      Feliu Fabà, Jordi (Universitat Politècnica de Catalunya, 2016-07-20)
      Master thesis
      Open Access
      Understanding the material failure of quasi-brittle materials, such as concrete, is of vital importance in civil engineering. A continuous-discontinuous model using X-FEM enrichment can be useful when an explicit representation ...
    • A coupled fluid FEM-DEM technique for predicting blasting operations in tunnels 

      Zárate Araiza, José Francisco; González Lopez, Jose Manuel; Miquel Canet, Juan; Löhner, Rainald; Oñate Ibáñez de Navarra, Eugenio (2018-12)
      Article
      Open Access
      We present recent developments in the coupling of the finite element method (FEM) and the discrete element method (DEM) for the analysis of rock blasting operations in tunnels. The coupled FEM-DEM technique has been proven ...
    • A crack-tracking technique for localized cohesive-frictional damage 

      Saloustros, Savvas; Pelà, Luca; Cervera Ruiz, Miguel (2015-12-01)
      Article
      Open Access
      This paper extends the use of crack-tracking techniques within the smeared crack approach for the numerical simulation of cohesive-frictional damage on quasi-brittle materials. The mechanical behaviour is described by an ...
    • 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 fracture mechanics approach to develop high crash resistant microstructures by press hardening 

      Casellas Padró, Daniel; Frómeta Gutiérrez, David; Lara, Antoni; Molas Busquets, Sílvia; Jonsén, Par (2017)
      Conference report
      Open Access
      Crashworthiness is a relevant engineering property for car parts. However it is not easy to measure at laboratory scale and complex impact tests have to be carried out to determine it. Crash re-sistance for high strength ...
    • A frequency-based approach for the detection and classification of structural changes using t-SNE 

      Agis Cherta, David; Pozo Montero, Francesc (Multidisciplinary Digital Publishing Institute (MDPI), 2019-11-21)
      Article
      Open Access
      This work presents a structural health monitoring (SHM) approach for the detection and classification of structural changes. The proposed strategy is based on t-distributed stochastic neighbor embedding (t-SNE), a nonlinear ...
    • A fully Lagrangian formulation for fluid-structure interaction problems with free-surface flows and fracturing solids 

      Cornejo Velázquez, Alejandro; Franci, Alessandro; Zárate Araiza, José Francisco; Oñate Ibáñez de Navarra, Eugenio (2021-07)
      Article
      Open Access
      This paper presents a novel coupled formulation for fluid-structure interaction (FSI) problems involving free-surface fluid flows, fracture phenomena, solid mutual contact and large displacements. The numerical formulation ...
    • A hybridizable discontinuous Galerkin phase-field model for brittle fracture 

      Muixí Ballonga, Alba; Fernández Méndez, Sonia; Rodríguez Ferran, Antonio (2019-05-01)
      Article
      Open Access
      Phase-field models for brittle fracture consider smeared representations of cracks, which are described by a continuous field that varies abruptly in the transition zone between unbroken and broken states. Computationally, ...
    • A new continuous-discontinuous damage model: cohesive cracks via an accurate energy-transfer process 

      Tamayo Mas, Elena; Rodríguez Ferran, Antonio (2014-02)
      Article
      Open Access
      A new continuous-discontinuous strategy to describe failure of quasi-brittle materials is presented. For the early stages of the failure process, a gradient-enhanced model based on smoothed displacements is employed. As ...
    • A Proper Generalized Decomposition (PGD) approach to crack propagation in brittle materials: with application to random field material properties 

      Garikapati, Hasini; Zlotnik, Sergio; Díez, Pedro; Verhoosel, Clemens V.; van Brummelen, Harald (Springer, 2020-02)
      Article
      Open Access
      Understanding the failure of brittle heterogeneous materials is essential in many applications. Heterogeneities in materialproperties are frequently modeled through random fields, which typically induces the need to solve ...
    • A rule of mixtures approach for delamination damage analysis in composite materials 

      Taherzadeh Fard, Alireza; Cornejo Velázquez, Alejandro; Jiménez Reyes, Sergio; Barbu, Lucia Gratiela (2023-09)
      Article
      Open Access
      The present study aims at investigating the delamination behavior of laminated composites in different loading modes within a homogenization theory of mixtures. The delamination damage phenomenon is introduced at the bulk ...
    • A three-dimensional FEM–DEM technique for predicting the evolution of fracture in geomaterials and concrete 

      Zárate Araiza, José Francisco; Cornejo, Alejandro; Oñate Ibáñez de Navarra, Eugenio (Springer, 2018-07)
      Article
      Open Access
      This paper extends to three dimensions (3D), the computational technique developed by the authors in 2D for predicting the onset and evolution of fracture in a finite element mesh in a simple manner based on combining the ...
    • A unified non-linear energy dissipation-based plastic-damage model for cyclic loading 

      Cornejo Velázquez, Alejandro; Jiménez Reyes, Sergio; Barbu, Lucia Gratiela; Oller Martínez, Sergio Horacio; Oñate Ibáñez de Navarra, Eugenio (2022-10)
      Article
      Open Access
      A new energy-dissipation-based rate-independent constitutive law within the framework of elastoplasticity coupled with damage is proposed. With this methodology, the inelastic strains and the stiffness degradation exhibited ...