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Jean-michel Bergheau - One of the best experts on this subject based on the ideXlab platform.

  • Numerical study of scratch velocity effect on recovery of Viscoelastic-viscoplastic solids
    International Journal of Mechanical Sciences, 2010
    Co-Authors: Nicolas Aleksy, Guillaume Kermouche, Alain Vautrin, Jean-michel Bergheau
    Abstract:

    The scratch test is a classical way to investigate the abrasive resistance of coatings and substrates. Because of the complex phenomena involved, the use of refined finite element analysis is often required to analyze the influence of specific parameters. In this paper, the influence of the tip velocity on the scratch recovery of polymer-like time-dependent solids is qualitatively investigated. More precisely the response of three constitutive Models is analyzed: an elastic-viscoplastic Model, a Linear Viscoelastic Model and finally a Viscoelastic-viscoplastic Model. This last Model is an original assembly based on the connection in series of the elastic-viscoplastic Model and the Linear Viscoelastic Model. For that, a new method allowing the connection in series of two different rheological Models in a FE code is presented. To analyze the numerical results, the concept of representative stress and representative strain rate of a scratch test is introduced.

  • Numerical study of scratch velocity effect on recovery of Viscoelastic–viscoplastic solids
    International Journal of Mechanical Sciences, 2010
    Co-Authors: Nicolas Aleksy, Guillaume Kermouche, Alain Vautrin, Jean-michel Bergheau
    Abstract:

    The scratch test is a classical way to investigate the abrasive resistance of coatings and substrates. Because of the complex phenomena involved, the use of refined finite element analysis is often required to analyze the influence of specific parameters. In this paper, the influence of the tip velocity on the scratch recovery of polymer-like time-dependent solids is qualitatively investigated. More precisely the response of three constitutive Models is analyzed: an elastic-viscoplastic Model, a Linear Viscoelastic Model and finally a Viscoelastic-viscoplastic Model. This last Model is an original assembly based on the connection in series of the elastic-viscoplastic Model and the Linear Viscoelastic Model. For that, a new method allowing the connection in series of two different rheological Models in a FE code is presented. To analyze the numerical results, the concept of representative stress and representative strain rate of a scratch test is introduced.

Nicolas Aleksy - One of the best experts on this subject based on the ideXlab platform.

  • Numerical study of scratch velocity effect on recovery of Viscoelastic-viscoplastic solids
    International Journal of Mechanical Sciences, 2010
    Co-Authors: Nicolas Aleksy, Guillaume Kermouche, Alain Vautrin, Jean-michel Bergheau
    Abstract:

    The scratch test is a classical way to investigate the abrasive resistance of coatings and substrates. Because of the complex phenomena involved, the use of refined finite element analysis is often required to analyze the influence of specific parameters. In this paper, the influence of the tip velocity on the scratch recovery of polymer-like time-dependent solids is qualitatively investigated. More precisely the response of three constitutive Models is analyzed: an elastic-viscoplastic Model, a Linear Viscoelastic Model and finally a Viscoelastic-viscoplastic Model. This last Model is an original assembly based on the connection in series of the elastic-viscoplastic Model and the Linear Viscoelastic Model. For that, a new method allowing the connection in series of two different rheological Models in a FE code is presented. To analyze the numerical results, the concept of representative stress and representative strain rate of a scratch test is introduced.

  • Numerical study of scratch velocity effect on recovery of Viscoelastic–viscoplastic solids
    International Journal of Mechanical Sciences, 2010
    Co-Authors: Nicolas Aleksy, Guillaume Kermouche, Alain Vautrin, Jean-michel Bergheau
    Abstract:

    The scratch test is a classical way to investigate the abrasive resistance of coatings and substrates. Because of the complex phenomena involved, the use of refined finite element analysis is often required to analyze the influence of specific parameters. In this paper, the influence of the tip velocity on the scratch recovery of polymer-like time-dependent solids is qualitatively investigated. More precisely the response of three constitutive Models is analyzed: an elastic-viscoplastic Model, a Linear Viscoelastic Model and finally a Viscoelastic-viscoplastic Model. This last Model is an original assembly based on the connection in series of the elastic-viscoplastic Model and the Linear Viscoelastic Model. For that, a new method allowing the connection in series of two different rheological Models in a FE code is presented. To analyze the numerical results, the concept of representative stress and representative strain rate of a scratch test is introduced.

Alain Vautrin - One of the best experts on this subject based on the ideXlab platform.

  • Numerical study of scratch velocity effect on recovery of Viscoelastic-viscoplastic solids
    International Journal of Mechanical Sciences, 2010
    Co-Authors: Nicolas Aleksy, Guillaume Kermouche, Alain Vautrin, Jean-michel Bergheau
    Abstract:

    The scratch test is a classical way to investigate the abrasive resistance of coatings and substrates. Because of the complex phenomena involved, the use of refined finite element analysis is often required to analyze the influence of specific parameters. In this paper, the influence of the tip velocity on the scratch recovery of polymer-like time-dependent solids is qualitatively investigated. More precisely the response of three constitutive Models is analyzed: an elastic-viscoplastic Model, a Linear Viscoelastic Model and finally a Viscoelastic-viscoplastic Model. This last Model is an original assembly based on the connection in series of the elastic-viscoplastic Model and the Linear Viscoelastic Model. For that, a new method allowing the connection in series of two different rheological Models in a FE code is presented. To analyze the numerical results, the concept of representative stress and representative strain rate of a scratch test is introduced.

  • Numerical study of scratch velocity effect on recovery of Viscoelastic–viscoplastic solids
    International Journal of Mechanical Sciences, 2010
    Co-Authors: Nicolas Aleksy, Guillaume Kermouche, Alain Vautrin, Jean-michel Bergheau
    Abstract:

    The scratch test is a classical way to investigate the abrasive resistance of coatings and substrates. Because of the complex phenomena involved, the use of refined finite element analysis is often required to analyze the influence of specific parameters. In this paper, the influence of the tip velocity on the scratch recovery of polymer-like time-dependent solids is qualitatively investigated. More precisely the response of three constitutive Models is analyzed: an elastic-viscoplastic Model, a Linear Viscoelastic Model and finally a Viscoelastic-viscoplastic Model. This last Model is an original assembly based on the connection in series of the elastic-viscoplastic Model and the Linear Viscoelastic Model. For that, a new method allowing the connection in series of two different rheological Models in a FE code is presented. To analyze the numerical results, the concept of representative stress and representative strain rate of a scratch test is introduced.

Guillaume Kermouche - One of the best experts on this subject based on the ideXlab platform.

  • Numerical study of scratch velocity effect on recovery of Viscoelastic-viscoplastic solids
    International Journal of Mechanical Sciences, 2010
    Co-Authors: Nicolas Aleksy, Guillaume Kermouche, Alain Vautrin, Jean-michel Bergheau
    Abstract:

    The scratch test is a classical way to investigate the abrasive resistance of coatings and substrates. Because of the complex phenomena involved, the use of refined finite element analysis is often required to analyze the influence of specific parameters. In this paper, the influence of the tip velocity on the scratch recovery of polymer-like time-dependent solids is qualitatively investigated. More precisely the response of three constitutive Models is analyzed: an elastic-viscoplastic Model, a Linear Viscoelastic Model and finally a Viscoelastic-viscoplastic Model. This last Model is an original assembly based on the connection in series of the elastic-viscoplastic Model and the Linear Viscoelastic Model. For that, a new method allowing the connection in series of two different rheological Models in a FE code is presented. To analyze the numerical results, the concept of representative stress and representative strain rate of a scratch test is introduced.

  • Numerical study of scratch velocity effect on recovery of Viscoelastic–viscoplastic solids
    International Journal of Mechanical Sciences, 2010
    Co-Authors: Nicolas Aleksy, Guillaume Kermouche, Alain Vautrin, Jean-michel Bergheau
    Abstract:

    The scratch test is a classical way to investigate the abrasive resistance of coatings and substrates. Because of the complex phenomena involved, the use of refined finite element analysis is often required to analyze the influence of specific parameters. In this paper, the influence of the tip velocity on the scratch recovery of polymer-like time-dependent solids is qualitatively investigated. More precisely the response of three constitutive Models is analyzed: an elastic-viscoplastic Model, a Linear Viscoelastic Model and finally a Viscoelastic-viscoplastic Model. This last Model is an original assembly based on the connection in series of the elastic-viscoplastic Model and the Linear Viscoelastic Model. For that, a new method allowing the connection in series of two different rheological Models in a FE code is presented. To analyze the numerical results, the concept of representative stress and representative strain rate of a scratch test is introduced.

Sang Yong Kim - One of the best experts on this subject based on the ideXlab platform.

  • A Linear Viscoelastic Model of matrix/core–shell modifier polymer blends
    Journal of Polymer Science Part B: Polymer Physics, 2000
    Co-Authors: Joong-hwan Choi, Jong-hoon Ryu, Sang Yong Kim
    Abstract:

    Palierne's emulsion Model is utilized to develop a Linear Viscoelastic Model for the rheological description of matrix/core–shell modifier blends with strong adhesion at the particle/matrix interface. In this Model, the total stress is assumed to be the sum of a mean stress and an additional mean stress. The mean stress due to the Viscoelastic effects in microflows of matrix polymers around the dispersed phase is formulated according to the Palierne approach. The additional mean stress due to strong adhesion at the interface is expressed with the three-parameter Maxwell Model. The rheological behavior of the matrix chains trapped by the shell of the modifier is described by the introduction of the frequency-dependent parameter ξ and its evolution equation. By definition, ξmax changes from zero to unity as the frequency increases. The additional mean stress predominates at low frequencies, and as the frequency increases, the contribution of the mean stress to the total stress becomes more significant. The experimental data obtained for polymethylmethacrylate/core–shell polybutylacrylate blends confirm that the Model developed in this study describes the rheological properties of incompatible blends more properly than the Palierne Model. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 942–953, 2000

  • a Linear Viscoelastic Model of matrix core shell modifier polymer blends
    Journal of Polymer Science Part B, 2000
    Co-Authors: Joong-hwan Choi, Jong-hoon Ryu, Sang Yong Kim
    Abstract:

    Palierne's emulsion Model is utilized to develop a Linear Viscoelastic Model for the rheological description of matrix/core–shell modifier blends with strong adhesion at the particle/matrix interface. In this Model, the total stress is assumed to be the sum of a mean stress and an additional mean stress. The mean stress due to the Viscoelastic effects in microflows of matrix polymers around the dispersed phase is formulated according to the Palierne approach. The additional mean stress due to strong adhesion at the interface is expressed with the three-parameter Maxwell Model. The rheological behavior of the matrix chains trapped by the shell of the modifier is described by the introduction of the frequency-dependent parameter ξ and its evolution equation. By definition, ξmax changes from zero to unity as the frequency increases. The additional mean stress predominates at low frequencies, and as the frequency increases, the contribution of the mean stress to the total stress becomes more significant. The experimental data obtained for polymethylmethacrylate/core–shell polybutylacrylate blends confirm that the Model developed in this study describes the rheological properties of incompatible blends more properly than the Palierne Model. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 942–953, 2000

  • Linear Viscoelastic behavior of acrylonitrile-butadiene-styrene (ABS) polymers in the melt: Interpretation of data with a Linear Viscoelastic Model of matrix/core-shell modifier polymer blends
    Korea-australia Rheology Journal, 2000
    Co-Authors: Joong-hwan Choi, Jong-hoon Ryu, Sang Yong Kim
    Abstract:

    The Linear Viscoelastic behavior of acrylonitrile-butadiene-styrene (ABS) polymers with different rubber content has been investigated in the frame of a Linear Viscoelastic Model, which takes into account the interconnectivity of the dispersed rubber particles. The Model developed in our previous work has been shown to properly predict the low frequency plateau for the storage modulus, which is generally observed in polymer blends containing core-shell-type impact modifiers. In the present study, further experiments have been carried out on ABS polymers with different rubber content to verify the validity of our Linear Viscoelastic Model. It has been found that our Model describes quite properly the rheological behavior of ABS polymers with different rubber content, especially at low frequencies. The experimental data confirm that our Model describes the rheological properties of rubber-modified thermoplastic polymers with strong adhesion at the particle/matrix interface more accurately than the Palierne Model.