Now showing items 1-19 of 19

    • A dynamic spring element model for the prediction of longitudinal failure of polymer composites 

      Tavares, Rodrigo Paiva; Otero Gruer, Fermín Enrique; Baiges Aznar, Joan; Turon Travesa, Albert; Camanho, Pedro P. (2019-04)
      Article
      Open Access
      A spring element model that takes into account the dynamic effects associated with fibre failure in composite materials is presented. The model is implemented in a parallel environment to allow a better performance in the ...
    • A methodology to generate design allowables of composite laminates using machine learning 

      Furtado, Carolina; Pereira, L.F.; Tavares, Rodrigo Paiva; Salgado, Henrique M.; Otero Gruer, Fermín Enrique; Catalanotti, Guiuseppe; Arteiro, Albertino; Bessa, Miguel A.; Camanho, Pedro P. (2021-12)
      Article
      Restricted access - publisher's policy
      This work represents the first step towards the application of machine learning techniques in the prediction of statistical design allowables of composite laminates. Building on data generated analytically, four machine ...
    • A synchrotron computed tomography dataset for validation of longitudinal tensile failure models based on fibre break and cluster development 

      Breite, Christian; Melnikov, Alexander; de Morais, Alfredo Balacó; Maire, Eric; Otero Gruer, Fermín Enrique; Gorbatikh, Larissa (Elsevier, 2021-12)
      Article
      Open Access
      We performed in-situ tensile tests on two carbon fibre/epoxy composites with continuous scanning using synchrotron computed tomography (CT). Both composites were cross-ply laminates, and two specimens were tested for each ...
    • An efficient multi-scale method for non-linear analysis of composite structures 

      Otero Gruer, Fermín Enrique; Martínez García, Javier; Oller Martínez, Sergio Horacio; Salomon Rotlisbeger, Ramon Omar (2015-11-01)
      Article
      Open Access
      The use of multi-scale procedures is encouraged by the continuous increase of computational capacity, but it is still a challenge performing a non-linear analysis of real composite structures without the aid of large ...
    • An invariant based transversely-isotropic constitutive model for unidirectional fibre reinforced composites considering the matrix viscous effects 

      Gerbaud, Paul William; Otero Gruer, Fermín Enrique; Bussetta, Philippe; Camanho, Pedro P. (2019-11)
      Article
      Open Access
      Fibres Reinforced Polymers (FRPs) are found in several applications in aeronautics, space and in the automotive industry. These applications are exposed to loading conditions, including impact, which results in a complex ...
    • Blind benchmarking of seven longitudinal tensile failure models for two virtual unidirectional composites 

      Breite, Christian; Melnikov, Alexander; Turon Travesa, Albert; de Morais, Alfredo Balacó; Otero Gruer, Fermín Enrique; Mesquita, F; Costa Balanzat, Josep; Mayugo Majó, Joan Andreu; Guerrero García, José María; Gorbatikh, Larissa (2021-01)
      Article
      Restricted access - publisher's policy
      Many models for prediction of longitudinal tensile failure of unidirectional (UD) composites have been developed in the last decades. These models require significant assumptions and simplifications, but their consequences ...
    • Damage evolution in open-hole laminated composite plates subjected to in-plane loads 

      Moure, M. M.; Otero Gruer, Fermín Enrique; Garcia Castillo, S. K.; Sanchez Saez, S.; Barbero, E; Barbero, Ever (2015-12-01)
      Article
      Open Access
      Damage evolution of notched composite laminates is analysed in this work using a discrete damage model, which estimates matrix damage evolution and fibre failure. The fibre damage is regularised with a Weibull distribution, ...
    • Effects of local stress fields around broken fibres on the longitudinal failure of composite materials 

      Tavares, Rodrigo Paiva; Guerrero Cruz, José Manuel; Otero Gruer, Fermín Enrique; Turon Travesa, Albert (2018-08-28)
      Article
      Open Access
      An in-depth analysis of the stress fields that surround a broken fibre in fibre reinforced composites is performed and the effects of different material properties are analysed. The stress fields obtained using a spring ...
    • Experimental characterization and constitutive modeling of the non-linear stress–strain behavior of unidirectional carbon–epoxy under high strain rate loading 

      Koerber, Hannes; Kuhn, Peter; Ploeck, Marina; Otero Gruer, Fermín Enrique; Gerbaud, Paul William; Rolfes, Raimund; Camanho, Pedro P. (Springer, 2018-12)
      Article
      Open Access
      The mechanical response of IM7-8552 carbon epoxy was investigated for transverse tension and transverse tension/in-plane shear loadings at static and dynamic strain rates using transverse tension and off-axis tension ...
    • Modelling viscoelastic behaviour of carbón nanotube-reinforced thermo-plastics 

      Otero Gruer, Fermín Enrique; Oller Martínez, Sergio Horacio; Martínez García, Javier; Salomón, Ramón Omar (Asociación Argentina de Mecánica Computacional, 2012)
      Conference report
      Open Access
      Carbon nanotubes (CNTs), since their discovery by Lijima (S. Lijima, Nature, 354:56-58 (1991)), are considered a new generation of reinforcement. Their "nano" size structure makes them potentially free of defects, which ...
    • Multiscale computational homogenization 

      Otero Gruer, Fermín Enrique; Oller Martínez, Sergio Horacio; Martínez García, Javier (Centro de Investigación en Matemáticas, 2017)
      Part of book or chapter of book
      Restricted access - publisher's policy
    • Multiscale computational homogenization: review and proposal of a new enhanced-first-order method 

      Otero Gruer, Fermín Enrique; Oller Martínez, Sergio Horacio; Martínez García, Javier (2018-04)
      Article
      Open Access
      The continuous increase of computational capacity has encouraged the extensive use of multiscale techniques to simulate the material behaviour on several fields of knowledge. In solid mechanics, the multiscale approaches ...
    • Multiscale numerical modelling of microstructured reinforced composites 

      Otero Gruer, Fermín Enrique (Universitat Politècnica de Catalunya, 2016-02-09)
      Doctoral thesis
      Open Access
      Most of the existing materials around us can be considered composite materials, since they are composed by several phases or components at certain spatial scale. The physical and chemical properties of composites, as occurs ...
    • Multiscale numerical modelling of microstructured reinforced composites 

      Otero Gruer, Fermín Enrique; Oller Martínez, Sergio Horacio; Martínez García, Javier (International Centre for Numerical Methods in Engineering (CIMNE), 2016)
      Book
      Open Access
      Most of the existing materials around us can be considered composite materials, since they are composed by several phases or components at certain spatial scale. The physical and chemical properties of composites, as occurs ...
    • Numerical homogenization for composite materials analysis: comparison with other micro mechanical formulations 

      Otero Gruer, Fermín Enrique; Oller Martínez, Sergio Horacio; Martínez García, Javier; Salomón, Ramón Omar (2015-04)
      Article
      Open Access
      This work presents a two-scale homogenization procedure to analyze three dimension composite structures by FEM. The theory implemented is compared with other micro-structural formulations: micro models and serial parallel ...
    • Numerical modelling of behaviour of carbon nanotube-reinforced composites 

      Otero Gruer, Fermín Enrique; Oller Martínez, Sergio Horacio; Martínez García, Javier; Salomon, O. (CIMNE, 2011)
      Conference report
      Open Access
      Since their discovery by Lijima in 1991[1], carbon nanotubes (CNTs), are considered a new generation of reinforcement [2]. Their "nano" size structure makes them potentially free of defects, which provides them with excellent ...
    • Strategy for an efficient material non-linear multiscale analysis 

      Martínez García, Javier; Otero Gruer, Fermín Enrique; Oller Martínez, Sergio Horacio (2015)
      Conference report
      Open Access
      As the internal microstructure of composite materials becomes more complex, multi-scale methods are gaining strength. These allow obtaining the material performance from the analysis of a representative volume element. The ...
    • Structural analyses of GLARE-GFRP transition for integrated VHF antenna on a fuselage panel 

      Turon Pujol, Francesc; Otero Gruer, Fermín Enrique; Martínez García, Javier (2020)
      Conference report
      Open Access
      The objective of this paper is to describe the numerical simulation of the transition zones in the multifunctional fuselage panel design to integrate a VHF (Very High Frequency) antenna. The panel is made of GLARE (Glass ...
    • Structural analyses of orthogrid fuselage panel for integrated Ku-band SatCom antenna 

      Turon Pujol, Francesc; Otero Gruer, Fermín Enrique; Martínez García, Javier (International Centre for Numerical Methods in Engineering (CIMNE), 2019)
      Conference lecture
      Open Access
      The aim of this work is to describe the structural analysis of a multifunctional aircraft fuselage panel. The structure of the panel has an embedded antenna tiles. The panel consists of UniDirectional (UD) carbon fibre ...