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Ara es mostren els items 1-20 de 105

    • 3D numerical modelling of twisting cracks under bending and torsion of skew notched beams 

      Benedetti, Lorenzo; Cervera Ruiz, Miguel; Chiumenti, Michele (2017-05)
      Article
      Accés obert
      The testing of mode III and mixed mode failure is every so often encountered in the dedicated literature of mechanical characterization of brittle and quasi-brittle materials. In this work, the application of the mixed ...

    • 3D numerical models of FSW processes with non-cylindrical pin 

      Bussetta, Philippe; Dialamishabankareh, Narges; Chiumenti, Michele; Agelet de Saracibar Bosch, Carlos; Cervera Ruiz, Miguel; Ponthot, Jean Philippe (Taylor & Francis, 2015-06)
      Article
      Accés obert
      Friction Stir Welding (FSW) process is a relatively recent welding process (patented in 1991). FSW is a solid-state joining process during which materials to be joined are not melted. During the FSW process, the behaviour ...

    • 3D numerical models using a fluid or a solid formulation of FSW processes with a non-cylindrical pin 

      Bussetta, Philippe; Dialamishabankareh, Narges; Chiumenti, Michele; Agelet de Saracibar Bosch, Carlos; Cervera Ruiz, Miguel; Boman, Romain; Ponthot, Jean Philippe (Springer, 2015-12)
      Article
      Accés obert
      Friction Stir Welding (FSW) process is a relatively recent welding process (patented in 1991). FSW is a solid-state joining process during which materials to be joined are not melted. During the FSW process, the behaviour ...

    • 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
      Accés restringit per política de l'editorial
      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 computational model for the numerical simulation of FSW processes 

      Agelet de Saracibar Bosch, Carlos; Chiumenti, Michele; Santiago, Diego; Cervera Ruiz, Miguel; Dialami, Narges; Lombera, Guillermo (Springer, 2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper a computational model for the numerical simulation of Friction Stir Welding (FSW) processes is presented. FSW is a new method of welding in solid state in which a shouldered tool with a profile probe is rotated ...

    • A fast and accurate two-stage strategy to evaluate the effect of the pin tool profile on metal flow, torque and forces in friction stir welding 

      Dialami, Narges; Cervera Ruiz, Miguel; Chiumenti, Michele; Agelet de Saracibar Bosch, Carlos (2017-03-01)
      Article
      Accés obert
      Pin geometry is a fundamental consideration in friction stir welding (FSW). It influences the thermal behaviour, material flow and forces during the weld and reflects on the joint quality. This work studies four pin ...

    • A hybrid numerical-experimental strategy for predicting mechanical response of components manufactured via FFF 

      Dialamishabankareh, Narges; Chiumenti, Michele; Cervera Ruiz, Miguel; Chasco Goñi, Uxue; Reyes Pozo, Guillermo; Pérez Martínez, Marco Antonio (2022-10)
      Article
      Accés obert
      In this paper a new methodology developed for predicting the mechanical performance of the structures additively manufactured by Fused Filament Fabrication is presented. The novelty of the approach consists in accounting ...

    • A localized mapped damage model for orthotropic materials 

      Pelà, Luca; Cervera Ruiz, Miguel; Oller Martínez, Sergio Horacio; Chiumenti, Michele (2014-05-08)
      Article
      Accés restringit per política de l'editorial
      This paper presents an implicit orthotropic model based on the Continuum Damage Mechanics isotropic models. A mapping relationship is established between the behaviour of the anisotropic material and that of an isotropic ...

    • A mixed stabilized finite element formulation for strain localization analysis 

      Chiumenti, Michele; Cervera Ruiz, Miguel; Agelet de Saracibar Bosch, Carlos (2010)
      Text en actes de congrés
      Accés obert
      This work exploits the concept of stabilization techniques to improve the behaviour of either mixed or pu/mixed u/εlinear/linear triangular elements when strain localization analysis is required. Different stabilization ...

    • A mixed three-field FE formulation for stress accurate analysis including the incompressible limit 

      Chiumenti, Michele; Cervera Ruiz, Miguel; Codina, Ramon (2015-01)
      Article
      Accés obert
      In previous works, the authors have presented the stabilized mixed displacement/pressure formulation to deal with the incompressibility constraint. More recently, the authors have derived stable mixed stress/displacement ...

    • A multi-criteria h-adaptive finite-element framework for industrial part-scale thermal analysis in additive manufacturing processes 

      Filho, Carlos Augusto Moreira; Caicedo Silva, Manuel Alejandro; Cervera Ruiz, Miguel; Chiumenti, Michele; Baiges Aznar, Joan (2022-12)
      Article
      Accés obert
      This work presents an h-adaptive finite-element (FE) strategy to address the numerical simulation of additive manufacturing (AM) of large-scale parts. The wire-arc additive manufacturing is chosen as the demonstrative ...

    • A novel stress-accurate FE technology for highly non-linear analysis with incompressibility constraint: application to the numerical simulation of the FSW process 

      Chiumenti, Michele; Cervera Ruiz, Miguel; Agelet de Saracibar Bosch, Carlos; Dialami, Narges (American Institute of Physics (AIP), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work a novel finite element technology based on a three-field mixed formulation is presented. The Variational Multi Scale (VMS) method is used to circumvent the LBB stability condition allowing the use of linear ...

    • A phenomenological model for the solidification of eutectic and hypoeutectic alloys including recalescence and undercooling 

      Chiumenti, Michele; Cervera Ruiz, Miguel; Salsi, Emilio; Zonato, Andrea (2018-05)
      Article
      Accés obert
      In this work, a novel phenomenological model is proposed to study the liquid-to-solid phase change of eutectic and hypoeutectic alloy compositions. The objective is to enhance the prediction capabilities of the solidification ...

    • A scalable parallel finite element framework for growing geometries: application to metal additive manufacturing 

      Miranda Neiva, Eric; Badia, Santiago; Martín Huertas, Alberto Francisco; Chiumenti, Michele (John Wiley & sons, 2019-09)
      Article
      Accés obert
      This work introduces an innovative parallel, fully-distributed finite element framework for growing geometries and its application to metal additive manufacturing. It is well-known that virtual part design and qualification ...

    • A scalable thermo-mechanical framework for the part-scale analysis in metal additive manufacturing processes 

      Filho, Carlos Augusto Moreira; Caicedo Silva, Manuel Alejandro; Cervera Ruiz, Miguel; Chiumenti, Michele; Baiges Aznar, Joan (2023)
      Comunicació de congrés
      Accés obert
      This work introduces an Additive Manufacturing (AM) Finite Element (FE) framework for the large-scale thermo-mechanical modeling of metal parts. Due to the complexity of the physical phe- nomenon and to meet the demands ...

    • A strategy for the numerical simulation of metal deposition and multi-pass welding processes 

      Dialami, Narges; Chiumenti, Michele; Agelet de Saracibar Bosch, Carlos; Cervera Ruiz, Miguel (Centro Internacional de Métodos Numéricos en Ingeniería (CIMNE), 2009)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work a numerical model is developed to accurately predict temperature evolution and distortions associated to the successive welding layers deposited during the multi-pass welding and metal deposition processes (MD).

    • Accurate and locking-free analysis of beams, plates and shells using solid elements 

      Saloustros, Savvas; Cervera Ruiz, Miguel; Kim, Sungchul; Chiumenti, Michele (Springer, 2021-03)
      Article
      Accés obert
      This paper investigates the capacity of solid finite elements with independent interpolations for displacements and strains to address shear, membrane and volumetric locking in the analysis of beam, plate and shell structures. ...

    • Accurate thermal-induced structural failure analysis under incompressible conditions 

      Filho, Carlos Augusto Moreira; Barbat Vlad, Gabriel; Cervera Ruiz, Miguel; Chiumenti, Michele (Elsevier, 2022-06)
      Article
      Accés restringit per política de l'editorial
      In this work, the performance of the mixed 3-field displacement/deviatoric-strain/pressure (u/e/p) finite element is examined for nonlinear thermo-mechanical structural applications under incompressible behavior. The ...

    • Advances in the numerical simulation of 3D FSW processes 

      Agelet de Saracibar Bosch, Carlos; Chiumenti, Michele; Cervera Ruiz, Miguel; Dialami, Narges; Santiago, Diego; Lombera, Guillermo (2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This work deals with the computational modeling and numerical simulation of 3D Friction Stir Welding (FSW) processes. Eulerian and ALE formulations have been used to solve the quasi-static thermal transient governing ...

    • An accurate approach to simulate friction stir welding processes using adaptive formulation refinement 

      Venghaus, Henning; Chiumenti, Michele; Baiges Aznar, Joan; Juhre, Daniel; Castañar Pérez, Inocencio (Elsevier, 2023-07-07)
      Article
      Accés restringit per política de l'editorial
      A novel Adaptive Formulation Refinement (AFR) strategy for Friction Stir Welding (FSW) problems is presented. In FSW, the accurate computation of strains is crucial to correctly predict the highly non-linear material ...