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L J Sluys - One of the best experts on this subject based on the ideXlab platform.

  • a partition of unity finite element method for simulating non linear debonding and Matrix Failure in thin fibre composites
    International Journal for Numerical Methods in Engineering, 2011
    Co-Authors: F K F Radtke, A Simone, L J Sluys
    Abstract:

    We present a partition of unity finite element method for simulating non-linear debonding and Matrix Failure in thin fibre composites. Fibres are superimposed on a background mesh without meshing them. The constitutive behaviour of the Matrix material, the fibre material and the fibre–Matrix bond can be independently defined. A concise derivation of the discrete governing equations is given for two classes of continuum damage models describing the Matrix material. A non-linear bond-slip law including debonding and fibre pull-out behaviour is used. Several examples illustrate the potential of the proposed approach. Copyright © 2010 John Wiley & Sons, Ltd.

  • A partition of unity finite element method for simulating non‐linear debonding and Matrix Failure in thin fibre composites
    International Journal for Numerical Methods in Engineering, 2010
    Co-Authors: F K F Radtke, A Simone, L J Sluys
    Abstract:

    We present a partition of unity finite element method for simulating non-linear debonding and Matrix Failure in thin fibre composites. Fibres are superimposed on a background mesh without meshing them. The constitutive behaviour of the Matrix material, the fibre material and the fibre–Matrix bond can be independently defined. A concise derivation of the discrete governing equations is given for two classes of continuum damage models describing the Matrix material. A non-linear bond-slip law including debonding and fibre pull-out behaviour is used. Several examples illustrate the potential of the proposed approach. Copyright © 2010 John Wiley & Sons, Ltd.

  • Simulation of Progressive Failure in Composite Laminates
    Lecture Notes in Computational Science and Engineering, 2009
    Co-Authors: F.p. Van Der Meer, L J Sluys
    Abstract:

    Fiber reinforced polymers are materials with excellent mechanical properties and relativelymuch design freedom.However, because complex Failuremechanisms originating from the microstructure of the material may occur, realistic simulation of the Failure process is still a challenge. Two alternative models for the modeling of Failure in composite laminates are presented. The first is a continuum damage model that is supposed to cover all ply Failure mechanisms. A limitation of the continuum approach with respect to the modeling of Matrix Failure is illustrated.Therefore, a discontinuousmodel has been developed for Matrix Failure specifically

F K F Radtke - One of the best experts on this subject based on the ideXlab platform.

Haydn N. G. Wadley - One of the best experts on this subject based on the ideXlab platform.

  • Damage evolution and acoustic emission mechanisms in {alpha}{sub 2} + {beta}/SCS-6 titanium Matrix composites
    Acta Materialia, 1997
    Co-Authors: David J. Sypeck, Haydn N. G. Wadley
    Abstract:

    Damage evolution and acoustic emission mechanisms have been investigated during the tensile deformation of two {alpha}{sub 2} + {beta} titanium aluminide Matrix composites reinforced with SCS-6 silicon carbide fiber. The alloys had distinctly different {beta} phase morphologies and resulting ductilities. A Ti-14Al-21Nb Matrix composite with a Matrix Failure strain significantly greater than the fiber exhibited annular microcracking of a brittle {beta}-depleted Matrix zone surrounding the fibers. Acoustic emission measurements indicated that this damage process increased rapidly near the composite yield point and continued at a constant rate thereafter. Acoustic emission detection of fiber fracture indicated that Failure occurred after about four fiber fractures at a significantly lower stress than predicted by a global load sharing model. A Ti-13Al-15Nb-4Mo-2V-7Ta Matrix composite with a Matrix Failure strain less than the fiber exhibited multiple Matrix cracking. Acoustic emission measurements indicated that Matrix cracking initiated well below the stress where primary Matrix cracks were first visually observed. Failure occurred after numerous fiber fractures at a significantly lower fiber stress than predicted by a fiber bundle model. Damage evolution data obtained from the calibrated acoustic emission measurements were combined with a simple micro-mechanical model to predict the inelastic contribution of Matrix cracking to the overallmore » deformation behavior.« less

  • Damage evolution and acoustic emission mechanisms in α2 + β/SCS-6 titanium Matrix composites
    Acta Materialia, 1997
    Co-Authors: David J. Sypeck, Haydn N. G. Wadley
    Abstract:

    Damage evolution and acoustic emission mechanisms have been investigated during the tensile deformation of two α 2 + β titanium aluminide Matrix composites reinforced with SCS-6 silicon carbide fiber. The alloys had distinctly different β phase morphologies and resulting ductilities. A Ti-14 Al-21 Nb Matrix composite with a Matrix Failure strain significantly greater than the fiber exhibited annular microcracking of a brittle β-depleted Matrix zone surrounding the fibers. Acoustic emission measurements indicated that this damage process increased rapidly near the composite yield point and continued at a constant rate thereafter. Acoustic emission detection of fiber fracture indicated that Failure occurred after about four fiber fractures at a significantly lower stress than predicted by a global load sharing model. A Ti-13 Al-15 Nb-4Mo-2V-7Ta Matrix composite with a Matrix Failure strain less than the fiber exhibited multiple Matrix cracking. Acoustic emission measurements indicated that Matrix cracking initiated well below the stress where primary Matrix cracks were first visually observed. Failure occurred after numerous fiber fractures at a significantly lower fiber stress than predicted by a fiber bundle model. Damage evolution data obtained from the calibrated acoustic emission measurements were combined with a simple micro-mechanical model to predict the inelastic contribution of Matrix cracking to the overall deformation behavior.

A Simone - One of the best experts on this subject based on the ideXlab platform.

David J. Sypeck - One of the best experts on this subject based on the ideXlab platform.

  • Damage evolution and acoustic emission mechanisms in {alpha}{sub 2} + {beta}/SCS-6 titanium Matrix composites
    Acta Materialia, 1997
    Co-Authors: David J. Sypeck, Haydn N. G. Wadley
    Abstract:

    Damage evolution and acoustic emission mechanisms have been investigated during the tensile deformation of two {alpha}{sub 2} + {beta} titanium aluminide Matrix composites reinforced with SCS-6 silicon carbide fiber. The alloys had distinctly different {beta} phase morphologies and resulting ductilities. A Ti-14Al-21Nb Matrix composite with a Matrix Failure strain significantly greater than the fiber exhibited annular microcracking of a brittle {beta}-depleted Matrix zone surrounding the fibers. Acoustic emission measurements indicated that this damage process increased rapidly near the composite yield point and continued at a constant rate thereafter. Acoustic emission detection of fiber fracture indicated that Failure occurred after about four fiber fractures at a significantly lower stress than predicted by a global load sharing model. A Ti-13Al-15Nb-4Mo-2V-7Ta Matrix composite with a Matrix Failure strain less than the fiber exhibited multiple Matrix cracking. Acoustic emission measurements indicated that Matrix cracking initiated well below the stress where primary Matrix cracks were first visually observed. Failure occurred after numerous fiber fractures at a significantly lower fiber stress than predicted by a fiber bundle model. Damage evolution data obtained from the calibrated acoustic emission measurements were combined with a simple micro-mechanical model to predict the inelastic contribution of Matrix cracking to the overallmore » deformation behavior.« less

  • Damage evolution and acoustic emission mechanisms in α2 + β/SCS-6 titanium Matrix composites
    Acta Materialia, 1997
    Co-Authors: David J. Sypeck, Haydn N. G. Wadley
    Abstract:

    Damage evolution and acoustic emission mechanisms have been investigated during the tensile deformation of two α 2 + β titanium aluminide Matrix composites reinforced with SCS-6 silicon carbide fiber. The alloys had distinctly different β phase morphologies and resulting ductilities. A Ti-14 Al-21 Nb Matrix composite with a Matrix Failure strain significantly greater than the fiber exhibited annular microcracking of a brittle β-depleted Matrix zone surrounding the fibers. Acoustic emission measurements indicated that this damage process increased rapidly near the composite yield point and continued at a constant rate thereafter. Acoustic emission detection of fiber fracture indicated that Failure occurred after about four fiber fractures at a significantly lower stress than predicted by a global load sharing model. A Ti-13 Al-15 Nb-4Mo-2V-7Ta Matrix composite with a Matrix Failure strain less than the fiber exhibited multiple Matrix cracking. Acoustic emission measurements indicated that Matrix cracking initiated well below the stress where primary Matrix cracks were first visually observed. Failure occurred after numerous fiber fractures at a significantly lower fiber stress than predicted by a fiber bundle model. Damage evolution data obtained from the calibrated acoustic emission measurements were combined with a simple micro-mechanical model to predict the inelastic contribution of Matrix cracking to the overall deformation behavior.