Now showing items 1-20 of 124

    • 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 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 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 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 model for the ultrasonic detection of surface-breaking cracks by the scanning laser source technique 

      Arias Vicente, Irene; Achenbach, J. D. (2004-01)
      Article
      Open Access
      A model for the scanning laser source (SLS) technique is presented. The SLS is a novel laser-based inspection method for the ultrasonic detection of small surface-breaking cracks. The generated ultrasonic signal is monitored ...
    • 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 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 ...
    • A variational model of fracture for tearing brittle thin sheets 

      Li, Bin; Millán Zurita, Daniel; Torres Sánchez, Alejandro; Arroyo Balaguer, Marino (2018-10)
      Article
      Open Access
      Tearing of brittle thin elastic sheets, possibly adhered to a substrate, involves a rich interplay between nonlinear elasticity, geometry, adhesion, and fracture mechanics. In addition to its intrinsic and practical interest, ...
    • Adaptive phase-field modeling of fracture propagation in bi-layered materials 

      Khan, Salman; Muixí Ballonga, Alba; Annavarapu, Chandrasekhar; Rodríguez Ferran, Antonio (2023-11-15)
      Article
      Restricted access - publisher's policy
      We study fracture propagation in bi-layered materials using an adaptive phase-field method. The method combines a phase-field representation of fracture with spatial adaptivity to provide mesh refinement in the smeared ...
    • Adaptive phase-field modeling of heterogeneous materials 

      Llorenç i Vilanova, Roger (Universitat Politècnica de Catalunya, 2023-06)
      Bachelor thesis
      Open Access
      Comprendre el comportament de les fractures és crucial per optimitzar el disseny d'estructures i components d'enginyeria, des de les infraestructures civils fins als components d'aeronaus. El model "phase-field" s'ha tornat ...
    • Adaptive refinement for phase-field models of brittle fracture based on Nitsche's method 

      Muixí Ballonga, Alba; Fernández Méndez, Sonia; Rodríguez Ferran, Antonio (Springer, 2020-03-18)
      Article
      Open Access
      A new adaptive refinement strategy for phase-field models of brittle fracture is proposed. The approach provides a computationally efficient solution to the high demand in spatial resolution of phase-field models. The ...
    • Analyse multi-échelle de l'approche énergétique de la rupture des grains au sein de matériaux granulaires 

      Salami, Younes (Universitat Politècnica de Catalunya, 2017-01-11)
      Doctoral thesis
      Open Access
      Covenantee:   École centrale de Nantes
      Au cours des dernières années, les analyses multi-échelles en mécanique des sols granulaires deviennent de plus en plus répandues. L’avantage de ce type d’approches réside dans leur capacité à établir un lien entre les ...