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Agglomeration Effect

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S. Kamarian – 1st expert on this subject based on the ideXlab platform

  • Vibrational behavior of non-uniform piezoelectric sandwich beams made of CNT-reinforced polymer nanocomposite by considering the Agglomeration Effect of CNTs
    Polymer Composites, 2017
    Co-Authors: S. Kamarian, Masoud Bodaghi, A Pourasghar, Salman Talebi

    Abstract:

    The present work deals with natural frequency analysis of non-uniform nanocomposite beams with surface-bonded piezoelectric layers by considering the Agglomeration Effect of Carbon Nanotubes (CNTs). The material properties of the nanocomposite beam are predicted employing Eshelby-Mori-Tanaka approach based on an equivalent fiber and compared with available experimental data in the literature. The equation of motion is derived employing Hamilton’s principle and Generalized Differential Quadrature technique as an efficient and accurate numerical tool is employed for free vibration analysis of the structures. Detailed parametric studies are carried out to examine influences of CNTs volume fraction, CNTs Agglomeration, thickness of piezoelectric layers, piezoelectric constant, dielectric constant, boundary conditions etc., on the behavior of freely vibrating smart structure. Results represent that for some cases, consideration of Agglomeration Effect of CNTs is not required while for some other cases it has a significant role on the response. The numerical results also reveal that using thick piezoelectric layer does not necessarily improve the natural frequency of the structure.

  • Vibrational behavior of non-uniform piezoelectric sandwich beams made of CNT-reinforced polymer nanocomposite by considering the Agglomeration Effect of CNTs
    Polymer Composites, 2016
    Co-Authors: S. Kamarian, A Pourasghar, Bodaghi, Salman Talebi

    Abstract:

    The present work deals with natural frequency analysis of non-uniform nanocomposite beams with surface-bonded piezoelectric layers by considering the Agglomeration Effect of Carbon Nanotubes (CNTs). The material properties of the nanocomposite beam are predicted employing Eshelby-Mori-Tanaka approach based on an equivalent fiber and compared with available experimental data in the literature. The equation of motion is derived employing Hamilton’s principle and Generalized Differential Quadrature technique as an efficient and accurate numerical tool is employed for free vibration analysis of the structures. Detailed parametric studies are carried out to examine influences of CNTs volume fraction, CNTs Agglomeration, thickness of piezoelectric layers, piezoelectric constant, dielectric constant, boundary conditions etc., on the behavior of freely vibrating smart structure. Results represent that for some cases, consideration of Agglomeration Effect of CNTs is not required while for some other cases it has a significant role on the response. The numerical results also reveal that using thick piezoelectric layer does not necessarily improve the natural frequency of the structure. POLYM. COMPOS., 2016. © 2016 Society of Plastics Engineers

  • free vibration analysis of functionally graded nanocomposite sandwich beams resting on pasternak foundation by considering the Agglomeration Effect of cnts
    Journal of Sandwich Structures and Materials, 2015
    Co-Authors: S. Kamarian, Masoud Bodaghi, M Shakeri, A Pourasghar

    Abstract:

    In the present work, by considering the Agglomeration Effect of single-walled carbon nanotubes, free vibration characteristics of functionally graded (FG) nanocomposite sandwich beams resting on Pasternak foundation are presented. The carbon nanotubes (CNTs) volume fraction is graded through the thicknesses of face sheets according to a generalized power–law distribution. The material properties of the FG nanocomposite sandwich beam are estimated using the Eshelby–Mori–Tanaka approach based on an equivalent fiber. The equations of motion are derived based on Timoshenko beam theory and employing Hamilton’s principle. Generalized differential quadrature technique as an efficient and accurate numerical tool is employed to obtain the natural frequencies of the structure. The verification study represents the accuracy of the solution for free vibration analysis of the nanocomposite sandwich beams resting on elastic foundation. Detailed parametric studies are carried out to investigate the influences of CNTs ag…

Shaker A. Meguid – 2nd expert on this subject based on the ideXlab platform

  • Modeling and characterization of carbon nanotube Agglomeration Effect on electrical conductivity of carbon nanotube polymer composites
    Journal of Applied Physics, 2014
    Co-Authors: S Gong, Z. H. Zhu, Jing Li, Shaker A. Meguid

    Abstract:

    This paper investigated the Effect of carbon nanotube (CNT) Agglomeration on the electrical conductivity of CNT-polymer composites by experimental characterization and theoretical modeling. The present experimental results show that the acid treatment of CNTs has significantly alleviated the CNT Agglomeration in CNT-polymer composites and improved the electrical conductivity of the composites compared with CNT-polymer composites made from the same pristine CNTs. The improvement by the acid treatment is further studied by a multiscale CNT percolation network model that considers the CNT Agglomeration based on experimental observation. Numerical results are in good agreement with the experimental data. The smaller the size of CNT agglomerates is in the experiments, the closer the measured electrical conductivity of CNT-polymer composites is to its theoretical limit. The current study verifies that (i) the CNT Agglomeration is the main cause that leads to a lower electrical conductivity of CNT-polymer composites than their theoretical limit, and (ii) the current multiscale percolation network model can quantitatively predict the electrical conductivity of CNT-polymer composites with CNT Agglomeration. The comprehensiveness of the developed modeling approach enables an evaluation of results in conjunction with experimental data in future works.

  • Carbon nanotube Agglomeration Effect on piezoresistivity of polymer nanocomposites
    Polymer (United Kingdom), 2014
    Co-Authors: S Gong, Z. H. Zhu, Shaker A. Meguid

    Abstract:

    Carbon nanotube (CNT) Agglomeration exists inevitably in all CNT-polymer composites. This paper quantified the Effect of CNT Agglomeration on the piezoresistivity of CNT-polymer composites. A new multiscale model of 3-dimensional deformable CNT percolating networks has been developed, where the CNT agglomerates were modeled as second phases embedded randomly in the polymer matrix. The newly developed model agrees quantitatively with experimental data. The study found that the CNT Agglomeration is responsible for the reduced electrical conductivity and nonlinearity of piezoresistivity with respect to the zero strain. Its Effect can be quantified by the newly developed model. Parametric analyses were conducted to show the Effects of morphology and electrical properties of CNTs, the Poisson’s ratio of CNT-polymer composites and the extent, internal density and size of CNT Agglomeration on the electrical conductivity and piezoresistivity. The current work provides a useful analysis tool for designing smart sensing and multifunctional polymer composites.

A Pourasghar – 3rd expert on this subject based on the ideXlab platform

  • Vibrational behavior of non-uniform piezoelectric sandwich beams made of CNT-reinforced polymer nanocomposite by considering the Agglomeration Effect of CNTs
    Polymer Composites, 2017
    Co-Authors: S. Kamarian, Masoud Bodaghi, A Pourasghar, Salman Talebi

    Abstract:

    The present work deals with natural frequency analysis of non-uniform nanocomposite beams with surface-bonded piezoelectric layers by considering the Agglomeration Effect of Carbon Nanotubes (CNTs). The material properties of the nanocomposite beam are predicted employing Eshelby-Mori-Tanaka approach based on an equivalent fiber and compared with available experimental data in the literature. The equation of motion is derived employing Hamilton’s principle and Generalized Differential Quadrature technique as an efficient and accurate numerical tool is employed for free vibration analysis of the structures. Detailed parametric studies are carried out to examine influences of CNTs volume fraction, CNTs Agglomeration, thickness of piezoelectric layers, piezoelectric constant, dielectric constant, boundary conditions etc., on the behavior of freely vibrating smart structure. Results represent that for some cases, consideration of Agglomeration Effect of CNTs is not required while for some other cases it has a significant role on the response. The numerical results also reveal that using thick piezoelectric layer does not necessarily improve the natural frequency of the structure.

  • Vibrational behavior of non-uniform piezoelectric sandwich beams made of CNT-reinforced polymer nanocomposite by considering the Agglomeration Effect of CNTs
    Polymer Composites, 2016
    Co-Authors: S. Kamarian, A Pourasghar, Bodaghi, Salman Talebi

    Abstract:

    The present work deals with natural frequency analysis of non-uniform nanocomposite beams with surface-bonded piezoelectric layers by considering the Agglomeration Effect of Carbon Nanotubes (CNTs). The material properties of the nanocomposite beam are predicted employing Eshelby-Mori-Tanaka approach based on an equivalent fiber and compared with available experimental data in the literature. The equation of motion is derived employing Hamilton’s principle and Generalized Differential Quadrature technique as an efficient and accurate numerical tool is employed for free vibration analysis of the structures. Detailed parametric studies are carried out to examine influences of CNTs volume fraction, CNTs Agglomeration, thickness of piezoelectric layers, piezoelectric constant, dielectric constant, boundary conditions etc., on the behavior of freely vibrating smart structure. Results represent that for some cases, consideration of Agglomeration Effect of CNTs is not required while for some other cases it has a significant role on the response. The numerical results also reveal that using thick piezoelectric layer does not necessarily improve the natural frequency of the structure. POLYM. COMPOS., 2016. © 2016 Society of Plastics Engineers

  • free vibration analysis of functionally graded nanocomposite sandwich beams resting on pasternak foundation by considering the Agglomeration Effect of cnts
    Journal of Sandwich Structures and Materials, 2015
    Co-Authors: S. Kamarian, Masoud Bodaghi, M Shakeri, A Pourasghar

    Abstract:

    In the present work, by considering the Agglomeration Effect of single-walled carbon nanotubes, free vibration characteristics of functionally graded (FG) nanocomposite sandwich beams resting on Pasternak foundation are presented. The carbon nanotubes (CNTs) volume fraction is graded through the thicknesses of face sheets according to a generalized power–law distribution. The material properties of the FG nanocomposite sandwich beam are estimated using the Eshelby–Mori–Tanaka approach based on an equivalent fiber. The equations of motion are derived based on Timoshenko beam theory and employing Hamilton’s principle. Generalized differential quadrature technique as an efficient and accurate numerical tool is employed to obtain the natural frequencies of the structure. The verification study represents the accuracy of the solution for free vibration analysis of the nanocomposite sandwich beams resting on elastic foundation. Detailed parametric studies are carried out to investigate the influences of CNTs ag…