Now showing items 1-20 of 159

    • A four-noded quadrilateral element for composite laminated plates/shell using the refined zigzag theory 

      Oñate Ibáñez de Navarra, Eugenio; Oller Martínez, Sergio Horacio; Eijo, Ariel (2012-06)
      External research report
      Open Access
      A new bilinear 4-noded quadrilateral element (called QLRZ) for the analysis of composite laminated and sandwich plates/shells based on the refined zigzag theory (RZT) proposed by Tessler et al. [1] is presented. The element ...
    • A four-noded quadrilateral element for composite laminated plates/shells using the refined zigzag theory 

      Eijo, Ariel; Oñate Ibáñez de Navarra, Eugenio; Oller Martínez, Sergio Horacio (John Wiley & Sons, 2013-08)
      Article
      Restricted access - publisher's policy
      A new bilinear four-noded quadrilateral element (called quadrilateral linear refined zigzag) for the analysis of composite laminated and sandwich plates/shells based on the refined zigzag theory is presented. The element ...
    • A generalized finite-strain damage model for quasi-incompressible hyperelasticity using hybrid formulation 

      Comellas Sanfeliu, Ester; Bellomo, Facundo J.; Oller Martínez, Sergio Horacio (2016-03)
      Article
      Open Access
      A new generalized damage model for quasi-incompressible hyperelasticity in a total Lagrangian finite-strain framework is presented. A Kachanov-like reduction factor (1 - D) is applied on the deviatoric part of the hyperelastic ...
    • A hierarchical finite element for composite laminated beams using a refined zigzag theory 

      Nallim, Liz G.; Oller Martínez, Sergio Horacio; Oñate Ibáñez de Navarra, Eugenio; Flores, Fernando Gabriel (2017-03)
      Article
      Open Access
      In this work a kinematics for laminated beams enriched with a refined formulation ZigZag (RZT), originally presented by Tessler et al. in 2007, introduced in a hierarchical one dimensional type “p” finite element is ...
    • A homeostatic-driven turnover remodelling constitutive model for healing in soft tissues 

      Comellas Sanfeliu, Ester; Gasser, Thomas Christian; Bellomo, Facundo J.; Oller Martínez, Sergio Horacio (2016-03)
      Article
      Open Access
      Remodelling of soft biological tissue is characterized by interacting biochemical and biomechanical events, which change the tissue's microstructure, and, consequently, its macroscopic mechanical properties. Remodelling ...
    • A laminated structural finite element for the behavior of large non-linear reinforced concrete structures 

      Escudero Torres, Cuauhtemoc; Oller Martínez, Sergio Horacio; Martínez García, Javier; Barbat Barbat, Horia Alejandro (2016-10)
      Article
      Open Access
      In order to correctly predict the kinematics of complex structures, analysis using three-dimensional finite elements (3DFEs) seems to be the best alternative. However, simulation of large multi-layered structures with many ...
    • A localized mapped damage model for orthotropic materials 

      Pelà, Luca; Cervera Ruiz, Miguel; Oller Martínez, Sergio Horacio; Chiumenti, Michele (2014-05-08)
      Article
      Restricted access - publisher's policy
      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 micromechanical approach to modeling the effect of impact induced damage on the vibration response of CFRP laminates 

      Pérez Martínez, Marco Antonio; Gil Espert, Lluís; Oller Martínez, Sergio Horacio; Felippa, Carlos (2015)
      Conference report
      Restricted access - publisher's policy
      This work deals with modeling the effect of low-velocity impact damage upon the vibration response of CFRP laminates through a micro-mechanical description of the induced internal damage. The serial-parallel (SP) continuum ...
    • A new damage model for structures subjected to cyclic loads 

      Barbat Barbat, Horia Alejandro; Oller Martínez, Sergio Horacio; Paredes, Jairo Andrés (2010)
      Conference report
      Restricted access - publisher's policy
      The structures subjected to dynamic loads often show alternative tensioncompression states stress; in such a case, even if certain damage (fracture) is reached during the tension cycle, the structure should maintain its ...
    • A numerical approach to simulate the behavior of fiber reinforced composite materials 

      Car, Eduardo J.; Oller Martínez, Sergio Horacio; Oñate Ibáñez de Navarra, Eugenio (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2000)
      Conference report
      Open Access
    • A numerical model of delamination in composite laminated beams using the LRZ beam element based on the refined zigzag theory 

      Eijo, Ariel; Oñate Ibáñez de Navarra, Eugenio; Oller Martínez, Sergio Horacio (2013-10)
      Article
      Restricted access - publisher's policy
      A method based on the Refined Zigzag Theory (RZT) to model delamination in composite laminated beam structures is presented. The novelty of this method is the use of one-dimensional finite elements to discretize the geometry ...
    • 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 river bed hydrokinetic turbine: a laminated composite material rotor design 

      Oller Aramayo, Sergio A.; Nallim, Liz G.; Oller Martínez, Sergio Horacio; Martínez García, Javier (International Centre for Numerical Methods in Engineering (CIMNE), 2017)
      Book
      Open Access
      This chapter presents the composite materials applied to Water Current Turbine (WCT) hydrokinetic turbines. Here will be briefly described the features of these turbines, the fluid-dynamic behavior of the rotor, and its ...
    • A stress driven growth model for soft tissue considering biological availability 

      Oller Martínez, Sergio Horacio; Bellomo, F.J; Armero, Francisco; Nallim, L.G. (2011)
      Conference report
      Restricted access - publisher's policy
      Some of the key factors that regulate growth and remodeling of tissues are fundamentally mechanical. However, it is important to take into account the role of bioavailability together with the stresses and strains in the ...
    • A temperature-based formulation for finite element analysis of generalized phase-change problems 

      Celentano, Diego Javier; Oñate Ibáñez de Navarra, Eugenio; Oller Martínez, Sergio Horacio (1993-01)
      External research report
      Open Access
    • A Viscoplastic constitutive model with strain rate variables for asphalt mixtures’ numerical simulation 

      González Lopez, Jose Manuel; Miquel Canet, Juan; Oller Martínez, Sergio Horacio; Miró Recasens, José Rodrigo (Elsevier, 2007)
      Article
      Open Access
      The study and development of recycling techniques for pavements is an increasing activity in engineering nowadays. This research line demands a more realistic characterization of the material properties with the aim of ...
    • A viscoplastic model with strain rate constitutive parameters for asphalt mixtures' response simulation 

      González Lopez, Jose Manuel; Miquel Canet, Juan; Oller Martínez, Sergio Horacio (2005)
      Conference report
      Open Access
      The mechanical behavior of the asphalt pavements is a complex phenomenon conditioned by the heterogeneity of the asphalt composite material. Experimental tests in the laboratory show a clear strain rate dependency in the ...
    • Advanced composite material simulation 

      Oller Martínez, Sergio Horacio; Martínez, X; Barbat Barbat, Horia Alejandro; Rastellini, F (2008)
      Conference report
      Restricted access - publisher's policy
      A computational methodology is presented for modelling the material non-linear mechanical behaviour of composite structures made of FRP (Fibre-Reinforced Polymers) laminates. The model is based on the appropriate combination ...
    • Advanced composite material simulation 

      Oller Martínez, Sergio Horacio; Martínez, X; Barbat Barbat, Horia Alejandro; Rastellini, F (2008-01)
      Article
      Open Access
      A computational methodology is presented for modeling the non-linear mechanical behavior of composite structures made of FRP (Fiber-Reinforced Polymers) laminates. The model is based on the appropriate combination of the ...