The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

Akira Watanabe - One of the best experts on this subject based on the ideXlab platform.

  • Strain rate and temperature dependence of Shear properties of epoxy resin with various molecular weight between cross-linkings
    Journal of Materials Science, 1999
    Co-Authors: Minoru Miwa, Akiyoshi Takeno, Teruyuki Yokoi, Akira Watanabe
    Abstract:

    Epoxy resins with various molecular weights between cross-linkings were prepared. In order to examine the strain rate and temperature dependence of the Shear Yield Strength and the Shear Strength, test specimens were subjected to Shear deformation at various strain rates and temperatures. The Shear Yield Strength and the Shear Strength increased almost linearly as the logarithm of the strain rate increased. The strain rate-temperature superposition held for these Shear properties. In particular, an experimental equation of the strain rate-temperature superposition for the Shear Yield Strength was found. The shift factor to obtain a master curve was given with the temperature dependence of an Arrhenius type. Furthermore, the strain rate-temperature-molecular weight between cross-linkings superposition held for the Shear properties.

  • Effects of surface and sizing treatments on axial compressive Strength of carbon fibres
    Journal of Materials Science, 1996
    Co-Authors: Minoru Miwa, Teruyuki Yokoi, A. Takeno, Y. Mori, Akira Watanabe
    Abstract:

    Attempts have been made to estimate the fibre axial compressive Strength of pitch-based graphitized fibres, and the effects of surface- and size-treatment on compressive Strength was investigated. The estimated compressive Strength of fibres decreases with increasing temperature. This decrease in compressive Strength may be accounted for by a decrease in the radial compression force owing to a decrease in the residual thermal stress and a decrease in Young's modulus of the resin matrix. There is a linear relationship between the estimated compressive Strength and radial compression force in a temperature range from room temperature to 80 °C. The real compressive Strength of the fibres, determined by extrapolating this straight line until the radial compression force is zero, increases with increasing Shear Yield Strength at the fibre-matrix interphase. In order to obtain reinforcing fibres with a higher compressive Strength, it will be necessary to surface- and size-treat the fibres.

  • Relation between Shear Strength at the fibre-matrix interphase and Shear properties of resin matrix
    Journal of Materials Science, 1995
    Co-Authors: Minoru Miwa, Akiyoshi Takeno, Kouichi Yamaguchi, Akira Watanabe
    Abstract:

    The Shear Yield Strength and the Shear Strength of a resin matrix increase almost linearly as the logarithm of the strain rate increases. This increasing tendency is almost the same at various temperatures. The strain rate temperature superposition held and an experimental equation was found to estimate the strain rate and temperature dependence of these Shear properties. The strain rate and temperature dependence of the Shear Yield Strength at the fibre-matrix interphase can be also estimated by the same equation. A strong quantitative relation was observed between the strain rate and temperature dependence of the Shear properties of a resin matrix and that of the Shear Yield Strength at the fibre-matrix interphase.

  • Strain rate and temperature dependence of Shear properties of epoxy resin
    Journal of Materials Science, 1995
    Co-Authors: Minoru Miwa, A. Takeimo, H. Yamazaki, Akira Watanabe
    Abstract:

    Epoxy resins with various ratios from two kinds of curing agents, ethylenediamine (EDA) and N,N′-dimethylethylenediamine (MeEDA), were prepared. In order to examine the strain rate and temperature dependence of the Shear Yield Strength and the Shear Strength, test specimens were subjected to Shear deformation at various strain rates and temperature. The Shear Yield Strength and the Shear Strength increased almost linearly as the logarithm of the strain rate increased. The strain rate-temperature superposition held for these Shear properties. In particular, an experimental equation of the strain rate-temperature superposition for the Shear Yield Strength was found. The shift factor to obtain a master curve was given with the temperature dependence of an Arrhenius type. Furthermore, the strain rate-temperature-mixing ratio of curing agent superposition held for the Shear properties, and the shift factor for these superpositions increased with the increase in MeEDA.

M. Salimi - One of the best experts on this subject based on the ideXlab platform.

  • Slab Analysis of Ring Rolling Assuming Constant Shear Friction
    Journal of Materials Engineering and Performance, 2011
    Co-Authors: Ali Parvizi, Karen Abrinia, M. Salimi
    Abstract:

    In this article, an analytic solution for ring rolling process based on the slab method theory is presented, in which the non-uniformity of the normal and Shear stresses across the section of the deforming material throughout the plastic region is considered. The friction factor multiplied by the Shear Yield Strength (τ =  mk ) is used to present friction between the main roll and the ring. The influence of the process parameters such as friction factor, feed speed, main roll rotational speed, and radii of the main roll and mandrel on process outputs is investigated. Complete expressions for the ring rolling pressure, force, and torque are obtained, and the position of neutral point is predicted. Comparison of the analytic results of this model with the experimental results of other investigators and FEM analysis show that they are in good agreement.

M Valsan - One of the best experts on this subject based on the ideXlab platform.

  • finite element analysis of Shear punch testing and experimental validation
    Materials & Design, 2010
    Co-Authors: Sunil Goyal, V Karthik, K V Kasiviswanathan, M Valsan
    Abstract:

    Abstract In this work, finite element analysis (FEA) of the Shear punch testing is carried out to study the specimen deformation up to Yielding and the results are compared and validated with experimental data for four different materials. The elastic portion of the FEA generated load–displacement curve overlaps with the corresponding experimental curve only when the fixture compliances are eliminated in experiments. Based on through thickness plasticity in the FEA study, the Shear Yield stress estimated at an offset of 0.15% of normalized displacement compares well with the experimentally determined Shear Yield Strength and satisfies the von Mises Yield relation σ ys = 1.73 τ ys . The effects of die-punch clearance and specimen thickness on Shear Yield Strength studied using FEA are also discussed.

Ali Parvizi - One of the best experts on this subject based on the ideXlab platform.

  • Slab Analysis of Ring Rolling Assuming Constant Shear Friction
    Journal of Materials Engineering and Performance, 2011
    Co-Authors: Ali Parvizi, Karen Abrinia, M. Salimi
    Abstract:

    In this article, an analytic solution for ring rolling process based on the slab method theory is presented, in which the non-uniformity of the normal and Shear stresses across the section of the deforming material throughout the plastic region is considered. The friction factor multiplied by the Shear Yield Strength (τ =  mk ) is used to present friction between the main roll and the ring. The influence of the process parameters such as friction factor, feed speed, main roll rotational speed, and radii of the main roll and mandrel on process outputs is investigated. Complete expressions for the ring rolling pressure, force, and torque are obtained, and the position of neutral point is predicted. Comparison of the analytic results of this model with the experimental results of other investigators and FEM analysis show that they are in good agreement.

  • An Analytical Approach to Ring Rolling Using Modified Slab Analysis
    Advanced Materials Research, 2011
    Co-Authors: Ali Parvizi, Karen Abrinia, Mohsen Hamedi
    Abstract:

    In this paper, based on the modified slab method theory, an analytical solution for ring rolling process is presented. The non-uniformity of the normal and Shear stresses across the section of the deforming material are considered. The friction factor multiplied by the Shear Yield Strength is used to present friction between the main roll and the ring. Complete expressions for the ring rolling pressure, force and torque are obtained and the position of neutral point is predicted. The influence of the process parameters such as friction factor, main roll rotational speed, feed speed, and others was investigated. Analytical results obtained from the present formulation were compared to previous experimental works and good agreement and improvements were observed.

Minoru Miwa - One of the best experts on this subject based on the ideXlab platform.

  • Strain rate and temperature dependence of Shear properties of epoxy resin with various molecular weight between cross-linkings
    Journal of Materials Science, 1999
    Co-Authors: Minoru Miwa, Akiyoshi Takeno, Teruyuki Yokoi, Akira Watanabe
    Abstract:

    Epoxy resins with various molecular weights between cross-linkings were prepared. In order to examine the strain rate and temperature dependence of the Shear Yield Strength and the Shear Strength, test specimens were subjected to Shear deformation at various strain rates and temperatures. The Shear Yield Strength and the Shear Strength increased almost linearly as the logarithm of the strain rate increased. The strain rate-temperature superposition held for these Shear properties. In particular, an experimental equation of the strain rate-temperature superposition for the Shear Yield Strength was found. The shift factor to obtain a master curve was given with the temperature dependence of an Arrhenius type. Furthermore, the strain rate-temperature-molecular weight between cross-linkings superposition held for the Shear properties.

  • Effects of surface and sizing treatments on axial compressive Strength of carbon fibres
    Journal of Materials Science, 1996
    Co-Authors: Minoru Miwa, Teruyuki Yokoi, A. Takeno, Y. Mori, Akira Watanabe
    Abstract:

    Attempts have been made to estimate the fibre axial compressive Strength of pitch-based graphitized fibres, and the effects of surface- and size-treatment on compressive Strength was investigated. The estimated compressive Strength of fibres decreases with increasing temperature. This decrease in compressive Strength may be accounted for by a decrease in the radial compression force owing to a decrease in the residual thermal stress and a decrease in Young's modulus of the resin matrix. There is a linear relationship between the estimated compressive Strength and radial compression force in a temperature range from room temperature to 80 °C. The real compressive Strength of the fibres, determined by extrapolating this straight line until the radial compression force is zero, increases with increasing Shear Yield Strength at the fibre-matrix interphase. In order to obtain reinforcing fibres with a higher compressive Strength, it will be necessary to surface- and size-treat the fibres.

  • Relation between Shear Strength at the fibre-matrix interphase and Shear properties of resin matrix
    Journal of Materials Science, 1995
    Co-Authors: Minoru Miwa, Akiyoshi Takeno, Kouichi Yamaguchi, Akira Watanabe
    Abstract:

    The Shear Yield Strength and the Shear Strength of a resin matrix increase almost linearly as the logarithm of the strain rate increases. This increasing tendency is almost the same at various temperatures. The strain rate temperature superposition held and an experimental equation was found to estimate the strain rate and temperature dependence of these Shear properties. The strain rate and temperature dependence of the Shear Yield Strength at the fibre-matrix interphase can be also estimated by the same equation. A strong quantitative relation was observed between the strain rate and temperature dependence of the Shear properties of a resin matrix and that of the Shear Yield Strength at the fibre-matrix interphase.

  • Strain rate and temperature dependence of Shear properties of epoxy resin
    Journal of Materials Science, 1995
    Co-Authors: Minoru Miwa, A. Takeimo, H. Yamazaki, Akira Watanabe
    Abstract:

    Epoxy resins with various ratios from two kinds of curing agents, ethylenediamine (EDA) and N,N′-dimethylethylenediamine (MeEDA), were prepared. In order to examine the strain rate and temperature dependence of the Shear Yield Strength and the Shear Strength, test specimens were subjected to Shear deformation at various strain rates and temperature. The Shear Yield Strength and the Shear Strength increased almost linearly as the logarithm of the strain rate increased. The strain rate-temperature superposition held for these Shear properties. In particular, an experimental equation of the strain rate-temperature superposition for the Shear Yield Strength was found. The shift factor to obtain a master curve was given with the temperature dependence of an Arrhenius type. Furthermore, the strain rate-temperature-mixing ratio of curing agent superposition held for the Shear properties, and the shift factor for these superpositions increased with the increase in MeEDA.