The Experts below are selected from a list of 6114 Experts worldwide ranked by ideXlab platform

Jie Yang - One of the best experts on this subject based on the ideXlab platform.

  • nonlinear free vibration of functionally graded graphene platelets reinforced Porous nanocomposite Plates resting on elastic foundation
    Composite Structures, 2018
    Co-Authors: Da Chen, Jie Yang
    Abstract:

    Abstract This paper presents an investigation on free vibration of functionally graded (FG) Porous nanocomposite Plates reinforced with a small amount of graphene platelets (GPLs) and supported by the two-parameter elastic foundations with different boundary conditions. Four different porosity distributions of the parent metal were reinforced by four various GPLs dispersion patterns (evenly or unevenly) along the thickness direction. To obtain graded distribution in both porosity and GPLs, the Young’s modulus, shear modulus and density of nanocomposites are assumed to vary through the thickness direction due to variation of internal pores and the volume fraction of GPLs. By employing Halpin-Tsai micromechanics model, effective elastic modulus of the nanocomposites is obtained according to the assumption of closed-cell cellular solids under Gaussian Random Field scheme. The governing equations of FG GPLs-reinforced metal foams resting on elastic foundations are derived from Hamilton’s principle by the means of classic plate theory with the consideration of von Karman strain-displacement relation. Applying the differential quadrature method, the dimensionless natural frequencies of Porous nanocomposite Plates with different boundary conditions are obtained and present method is thoroughly validated with the results in open literature. The comprehensive parametric studies on different porosity coefficients, GPL dispersion patterns, weight fraction of GPL, aspect ratios, thickness ratios and parameters of elastic foundation on free vibration of FG GPLs-reinforced Porous Plates with various boundary conditions. An interesting finding is that the increase of porosity coefficients would lead to the linearly decrease of both mass density and stiffness of the Plates, but the increase of porosity coefficients does not always induce the decrease of natural frequencies. Moreover, both porosity distribution and GPL dispersion pattern have a distinct effect on dynamic characteristics, the former plays a more important role than the latter in analysing mechanical properties of FG GPLs-reinforced Plates.

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

  • an analytical study on the free vibration of moderately thick fluid infiltrated Porous annular sector Plates
    Journal of Vibration and Control, 2018
    Co-Authors: A S Rezaei, A R Saidi
    Abstract:

    An exact analytical approach based on Mindlin plate theory is considered for free vibration analysis of fluid-saturated Porous annular sector Plates. The interconnected network of pores is saturated by inviscid fluid and the fluid is trapped in the network. The plate’s radial edges are considered to be simply supported and four auxiliary functions are used to evaluate the natural frequencies of Porous Plates under undrained condition. The mechanical properties of the material are considered to vary through the thickness by expressing shear modulus and density in terms of a simple cosine rule in case of Plates with pores free of fluid. The present method is validated by comparing it with the results of other accurate solutions found in the literature. The influence of the coefficient of plate porosity, geometrical parameters as well as the effect of fluid on natural frequency response of Porous annular sector Plates under various boundary conditions are comprehensively investigated. It is found that the pr...

Da Chen - One of the best experts on this subject based on the ideXlab platform.

  • nonlinear free vibration of functionally graded graphene platelets reinforced Porous nanocomposite Plates resting on elastic foundation
    Composite Structures, 2018
    Co-Authors: Da Chen, Jie Yang
    Abstract:

    Abstract This paper presents an investigation on free vibration of functionally graded (FG) Porous nanocomposite Plates reinforced with a small amount of graphene platelets (GPLs) and supported by the two-parameter elastic foundations with different boundary conditions. Four different porosity distributions of the parent metal were reinforced by four various GPLs dispersion patterns (evenly or unevenly) along the thickness direction. To obtain graded distribution in both porosity and GPLs, the Young’s modulus, shear modulus and density of nanocomposites are assumed to vary through the thickness direction due to variation of internal pores and the volume fraction of GPLs. By employing Halpin-Tsai micromechanics model, effective elastic modulus of the nanocomposites is obtained according to the assumption of closed-cell cellular solids under Gaussian Random Field scheme. The governing equations of FG GPLs-reinforced metal foams resting on elastic foundations are derived from Hamilton’s principle by the means of classic plate theory with the consideration of von Karman strain-displacement relation. Applying the differential quadrature method, the dimensionless natural frequencies of Porous nanocomposite Plates with different boundary conditions are obtained and present method is thoroughly validated with the results in open literature. The comprehensive parametric studies on different porosity coefficients, GPL dispersion patterns, weight fraction of GPL, aspect ratios, thickness ratios and parameters of elastic foundation on free vibration of FG GPLs-reinforced Porous Plates with various boundary conditions. An interesting finding is that the increase of porosity coefficients would lead to the linearly decrease of both mass density and stiffness of the Plates, but the increase of porosity coefficients does not always induce the decrease of natural frequencies. Moreover, both porosity distribution and GPL dispersion pattern have a distinct effect on dynamic characteristics, the former plays a more important role than the latter in analysing mechanical properties of FG GPLs-reinforced Plates.

  • Buckling and free vibration analyses of functionally graded graphene reinforced Porous nanocomposite Plates based on Chebyshev-Ritz method
    'Elsevier BV', 2018
    Co-Authors: Yang Jie, Da Chen, Kitipornchai Sritawat
    Abstract:

    This paper is concerned with the buckling and free vibration behaviors of functionally graded (FG) Porous nanocomposite Plates reinforced with graphene platelets (GPLs). The Porous Plates are constructed based on a multiplayer model with GPLs uniformly or non-uniformly distributed in the metal matrix containing open-cell internal pores. The modified Halpin-Tsai micromechanics model, the extended rule of mixture, and the typical mechanical properties of open-cell metal foams are used to determine the effective properties of the Porous nanocomposite. By using the first-order shear deformation plate theory (FSDT) to account for the transverse shear strain and Chebyshev-Ritz method to discretize the displacement fields, the governing equations are derived and then solved to calculate the critical uniaxial, biaxial and shear buckling loads and natural frequencies of the Plates with different porosity distributions and GPL dispersion patterns. After a convergence and validation study to verify the present analysis, a comprehensive parametric investigation on the influences of the weight fraction and geometric parameters of GPL nanofiller and the porosity coefficient is conducted to identify the most effective way to achieve improved buckling and vibration resistances of the Porous nanocomposite plate

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

  • an analytical study on the free vibration of moderately thick fluid infiltrated Porous annular sector Plates
    Journal of Vibration and Control, 2018
    Co-Authors: A S Rezaei, A R Saidi
    Abstract:

    An exact analytical approach based on Mindlin plate theory is considered for free vibration analysis of fluid-saturated Porous annular sector Plates. The interconnected network of pores is saturated by inviscid fluid and the fluid is trapped in the network. The plate’s radial edges are considered to be simply supported and four auxiliary functions are used to evaluate the natural frequencies of Porous Plates under undrained condition. The mechanical properties of the material are considered to vary through the thickness by expressing shear modulus and density in terms of a simple cosine rule in case of Plates with pores free of fluid. The present method is validated by comparing it with the results of other accurate solutions found in the literature. The influence of the coefficient of plate porosity, geometrical parameters as well as the effect of fluid on natural frequency response of Porous annular sector Plates under various boundary conditions are comprehensively investigated. It is found that the pr...

Koki Horikoshi - One of the best experts on this subject based on the ideXlab platform.

  • preparation and characterisation of nanofibrous cellulose plate as a new solid support for microbial culture
    Soft Matter, 2007
    Co-Authors: Shigeru Deguchi, Mikiko Tsudome, Yihong Shen, Kaoru Tsujii, Koki Horikoshi
    Abstract:

    Porous Plates made of nanofibrous crystalline cellulose were prepared, and used as a solid support for microbial cultures. Representative mesophilic microorganisms (Escherichia coli, Bacillus subtilis, and Saccharomyces cerevisiae) grew on the cellulose plate, just as well as they did on the conventional agar plate. In situ optical microscopic examination revealed that the cellulose plate remained unchanged up to 280 °C at a constant pressure of 25 MPa. Due to the structural stability at high temperatures, a representative thermophile, Thermus thermophilus, was cultured successfully on the cellulose plate at 80 °C. Mouse fibroblast cells did not show significant adhesion or extension on the cellulose plate.

  • preparation and characterisation of nanofibrous cellulose plate as a new solid support for microbial culture
    Soft Matter, 2007
    Co-Authors: Shigeru Deguchi, Mikiko Tsudome, Yihong Shen, Kaoru Tsujii, Satoshi Konishi, Susumu Ito, Koki Horikoshi
    Abstract:

    Porous Plates made of nanofibrous crystalline cellulose were prepared, and used as a solid support for microbial cultures. Representative mesophilic microorganisms (, , and ) grew on the cellulose plate, just as well as they did on the conventional agar plate. optical microscopic examination revealed that the cellulose plate remained unchanged up to 280 °C at a constant pressure of 25 MPa. Due to the structural stability at high temperatures, a representative thermophile, , was cultured successfully on the cellulose plate at 80 °C. Mouse fibroblast cells did not show significant adhesion or extension on the cellulose plate.