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    Modelling viscoelastic behaviour of carbón nanotube-reinforced thermo-plastics  Open access

     Otero Gruer, Fermin Enrique; Oller Martinez, Sergio Horacio; Martinez Garcia, Xavier; Salomon, Ramon Omar
    Congreso Argentino de Mecánica Computacional
    p. 1571-1590
    Presentation's date: 2012-11-15
    Presentation of work at congresses

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    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 provides them with excellent physical properties. There are two main nanotube types: single wall nanotubes (SWCNTs), which are made of a single wall tube; and multiwall nanotubes (MWCNTs), which consist in several concentric walls, one inside the other. A key factor for the reinforcement efficiency in a composite it is the interface bonding between the CNTs and the matrix. This work presents a new constitutive model to predict the mechanical performance of composites made of a thermo-plastic matrix reinforced with CNTs. The model takes into account explicitly the mechanical contribution of the interface between the matrix and the CNTs (F. Otero et. al., Comp Structures, 94:2920-2930 (2012)). The constitutive model is based in the mixing theory, which obtains the composite performance from the response of each constituent component, each one simulated with its own constitutive law. The model has been implemented into an in-house FEM code: PLCd. As an application example, this code is used to predict the mechanical properties of a straight beam with different material configurations. In this case, a viscoelastic constitutive model is proposed for the polymeric matrix. The viscous response within the elastic range of the materials is studied. This response shows a high capacity of energy dissipation in composites reinforced with MWCNTs.

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    Numerical modelling of behaviour of carbon nanotube-reinforced composites  Open access

     Otero-Gruer, Fermín; Oller Martinez, Sergio Horacio; Martinez Garcia, Xavier; Salomon, Ramon Omar
    International Conference on Computational Plasticity Fundamentals and Applications
    p. 1-12
    Presentation's date: 2011-09-08
    Presentation of work at congresses

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    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 physical properties [3,4]. There are two main nanotube types: single wall nanotubes (SWNT) and multi wall nanotubes (MWNT). These last ones consist in several concentric walls, one inside the other. In a composite, one the most important factors that condition their mechanical performance is the interfacial tension between matrix and reinforcement. In general, the loads in a composite structure are introduced to the matrix and then are transferred to the reinforcement through the interface [5]. Therefore, the interface can be defined as the region, surrounding the reinforcement, where this stress transfer takes place. The properties of the composite depend on the properties of this region and its ability to transfer the load efficiently. This work proposes a new formulation to predict the mechanical properties and mechanical behaviour of nanotube-reinforced composites. The formulation is based on the mixing theory [6]. It obtains the behaviour of the composite from the mechanical performance of its constitutive materials: matrix, carbon-nanotube and the interface that bonds both of them.

  • Modelling the elastic behaviour of carbon nanotube-reinforced composites

     Otero-Gruer, Fermín; Oller Martinez, Sergio Horacio; Martinez Garcia, Xavier; Salomon, Ramon Omar
    ECCOMAS Thematic Conference on Mechanical Response of Composites
    p. 353-360
    Presentation's date: 2011-09-22
    Presentation of work at congresses

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    Carbon nanotubes (CNTs), since their discovery by Lij ima in 1991 [1], are considered a new generation of reinforcement [2]. Their "nano" size structure makes them potentially free of defects, which provides them with excellent physical properties [3,4]. There are two main nanotube types: single wall nanotubes (SWNT), which are made of a single wall tube; and multiwall nanotubes (MWNT), which consist in several concentric walls, one inside the other. In a composite, one the most important factor is the interfacial tension between matrix and reinforcement. In general, the loads in a composite structure are introduced through the matrix and then are transferred to the reinforcement through the interface [5]. Therefore, the interface can be defined as the region surrounding the reinforcement where this stress transfer takes place. The properties of the composite depend on the properties of this regíon and its ability to transfer the load efficiently. This work proposes a new formulation to predict the mechanical properties of nanotube-reinforced composites. The formulation is based on the mixing theory [6]. It obtains the properties of the composite from the mechanical performance of its constitutive materials: matrix, carbon-nanotube and the interface that bonds both of them.

  • Modelling of behaviour of carbon nanotube-reinforced composites

     Otero, Fermin; Oller Martinez, Sergio Horacio; Martinez Garcia, Xavier; Salomon, Ramon Omar
    Congreso Nacional de Materiales Compuestos
    p. 545-550
    Presentation's date: 2011-07-06
    Presentation of work at congresses

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  • Multiscale reinforcement of semi-crystalline thermoplastic sheets and honeycombs

     Salomon, Ramon Omar; Oñate Ibáñez de Navarra, Eugenio; Oller Martinez, Sergio Horacio; Rastellini Canela, Fernando Gabriel; Martinez Garcia, Xavier; Otero-Gruer, Fermín
    Competitive project

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  • Advanced serial-parallel mixing theory for composite materials analysis. Continuum basis and finite element applications

     Rastellini Canela, Fernando Gabriel; Oller Martinez, Sergio Horacio; Salomon, Ramon Omar; Oñate Ibáñez de Navarra, Eugenio
    International Conference on Computational Plasticity
    p. 50-60
    Presentation's date: 2003
    Presentation of work at congresses

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  • Fatigue analysis of materials and structures using a continuum damage model

     Salomon, Ramon Omar; Oller Martinez, Sergio Horacio; Oñate Ibáñez de Navarra, Eugenio
    The international journal of forming processes
    Vol. 5, num. 2-3-4, p. 493-503
    Date of publication: 2002-09
    Journal article

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  • A continuum mechanics model for mechanical fatigue analysis

     Oller Martinez, Sergio Horacio; Salomon, Ramon Omar; Oñate Ibáñez de Navarra, Eugenio
    Computational materials science
    Vol. 32, num. 2, p. 175-195
    Date of publication: 2005-02
    Journal article

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  • Study and prediction of the mechanical performance of a nanotube-reinforced composite

     Otero, Fermin; Martinez Garcia, Xavier; Oller Martinez, Sergio Horacio; Salomon, Ramon Omar
    Composite structures
    Vol. 94, num. 9, p. 2920-2930
    DOI: 10.1016/j.compstruct.2012.04.001
    Date of publication: 2012-09
    Journal article

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  • Composite materials non-linear modelling for long fibre-reinforced laminates. Continuum basis, computational aspects and validations

     Rastellini Canela, Fernando Gabriel; Oller Martinez, Sergio Horacio; Salomon, Ramon Omar; Oñate Ibáñez de Navarra, Eugenio
    Computers & structures
    Vol. 86, num. 9, p. 879-896
    DOI: 10.1016/j.compstruc.2007.04.009
    Date of publication: 2008
    Journal article

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