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Masatoshi Miki – One of the best experts on this subject based on the ideXlab platform.

  • Static load dispersion analysis of solid–air composites: Effect of Adhesive Film on the load dispersion
    Journal of Materials Processing Technology, 2004
    Co-Authors: Tsutao Katayama, Hidetake Yamamoto, Mutsumi Inoue, Masatoshi Miki
    Abstract:

    Abstract In order to propose a new movement of the material design, the load dispersion of the solid–air composites caused by the hydrostatic pressures is investigated by applying numerical analysis. To simplify the evaluation of the load dispersion, the solid–air load transmission is supposed, where each mechanical field of closed cell is independent and that two different fields being in both sides of a cell wall satisfy the equilibrium of forces through the cell wall. The nonlinear deformation under indentation was incrementally simulated by using the finite element formulation based on displacement method. The effect of Adhesive Film on the load dispersion is considered in the numerical model. It was shown that the assumption of the solid–air load transmission is useful in evaluating the static load dispersion because the numerical results were well in agreement with the experimental ones. And it was clarified that a few structural design parameters become effective for the load dispersion.

  • Static Load Dispersion Analysis of Solid-Air Composites-Effect of Adhesive Film on the Load Dispersion-
    Journal of the Society of Materials Science Japan, 2003
    Co-Authors: Masatoshi Miki, Tsutao Katayama, Hidetake Yamamoto
    Abstract:

    In order to propose a new movement of the composite material design, the load dispersion of the solid-air composites caused by the hydrostatic pressures is investigated by applying numerical analysis. To simplify the evaluation of the load dispersion, the admissible stress field is supposed, where each stress field of closed cell is independent and that two different fields being in both sides of a cell wall satisfy the equilibrium of forces through the cell wall. The non-linear deformation under indentation was incrementally simulated by using the finite element formulation based on displacement method. The effect of Adhesive Film on the load dispersion is considered in the numerical model. It was shown that the assumption of admissible stress field on the interfacial load transmission is useful in evaluating the static load dispersion because the numerical results were well in agreement with the experimental ones. And it was clarified that a few structural design parameters become effective for the load dispersion.

Tsutao Katayama – One of the best experts on this subject based on the ideXlab platform.

  • Static load dispersion analysis of solid–air composites: Effect of Adhesive Film on the load dispersion
    Journal of Materials Processing Technology, 2004
    Co-Authors: Tsutao Katayama, Hidetake Yamamoto, Mutsumi Inoue, Masatoshi Miki
    Abstract:

    Abstract In order to propose a new movement of the material design, the load dispersion of the solid–air composites caused by the hydrostatic pressures is investigated by applying numerical analysis. To simplify the evaluation of the load dispersion, the solid–air load transmission is supposed, where each mechanical field of closed cell is independent and that two different fields being in both sides of a cell wall satisfy the equilibrium of forces through the cell wall. The nonlinear deformation under indentation was incrementally simulated by using the finite element formulation based on displacement method. The effect of Adhesive Film on the load dispersion is considered in the numerical model. It was shown that the assumption of the solid–air load transmission is useful in evaluating the static load dispersion because the numerical results were well in agreement with the experimental ones. And it was clarified that a few structural design parameters become effective for the load dispersion.

  • Static Load Dispersion Analysis of Solid-Air Composites-Effect of Adhesive Film on the Load Dispersion-
    Journal of the Society of Materials Science Japan, 2003
    Co-Authors: Masatoshi Miki, Tsutao Katayama, Hidetake Yamamoto
    Abstract:

    In order to propose a new movement of the composite material design, the load dispersion of the solid-air composites caused by the hydrostatic pressures is investigated by applying numerical analysis. To simplify the evaluation of the load dispersion, the admissible stress field is supposed, where each stress field of closed cell is independent and that two different fields being in both sides of a cell wall satisfy the equilibrium of forces through the cell wall. The non-linear deformation under indentation was incrementally simulated by using the finite element formulation based on displacement method. The effect of Adhesive Film on the load dispersion is considered in the numerical model. It was shown that the assumption of admissible stress field on the interfacial load transmission is useful in evaluating the static load dispersion because the numerical results were well in agreement with the experimental ones. And it was clarified that a few structural design parameters become effective for the load dispersion.

Hidetake Yamamoto – One of the best experts on this subject based on the ideXlab platform.

  • Static load dispersion analysis of solid–air composites: Effect of Adhesive Film on the load dispersion
    Journal of Materials Processing Technology, 2004
    Co-Authors: Tsutao Katayama, Hidetake Yamamoto, Mutsumi Inoue, Masatoshi Miki
    Abstract:

    Abstract In order to propose a new movement of the material design, the load dispersion of the solid–air composites caused by the hydrostatic pressures is investigated by applying numerical analysis. To simplify the evaluation of the load dispersion, the solid–air load transmission is supposed, where each mechanical field of closed cell is independent and that two different fields being in both sides of a cell wall satisfy the equilibrium of forces through the cell wall. The nonlinear deformation under indentation was incrementally simulated by using the finite element formulation based on displacement method. The effect of Adhesive Film on the load dispersion is considered in the numerical model. It was shown that the assumption of the solid–air load transmission is useful in evaluating the static load dispersion because the numerical results were well in agreement with the experimental ones. And it was clarified that a few structural design parameters become effective for the load dispersion.

  • Static Load Dispersion Analysis of Solid-Air Composites-Effect of Adhesive Film on the Load Dispersion-
    Journal of the Society of Materials Science Japan, 2003
    Co-Authors: Masatoshi Miki, Tsutao Katayama, Hidetake Yamamoto
    Abstract:

    In order to propose a new movement of the composite material design, the load dispersion of the solid-air composites caused by the hydrostatic pressures is investigated by applying numerical analysis. To simplify the evaluation of the load dispersion, the admissible stress field is supposed, where each stress field of closed cell is independent and that two different fields being in both sides of a cell wall satisfy the equilibrium of forces through the cell wall. The non-linear deformation under indentation was incrementally simulated by using the finite element formulation based on displacement method. The effect of Adhesive Film on the load dispersion is considered in the numerical model. It was shown that the assumption of admissible stress field on the interfacial load transmission is useful in evaluating the static load dispersion because the numerical results were well in agreement with the experimental ones. And it was clarified that a few structural design parameters become effective for the load dispersion.

Gérard Bernhart – One of the best experts on this subject based on the ideXlab platform.

  • Experimental study and in-situ FBG monitoring of process-induced strains during autoclave co-curing, co-bonding and secondary bonding of composite laminates
    Composites Part A: Applied Science and Manufacturing, 2021
    Co-Authors: Laure Moretti, Philippe Olivier, Bruno Castanié, Gérard Bernhart
    Abstract:

    The geometric stability of bonded structural parts, such as self-stiffened panels, is a critical issue in aeronautics. However, autoclave curing and bonding of large complex integrated primary structures often induce distortions compromising their geometric stability. Composite cure-induced strains and distortions have been extensively studied in the literature but the influence of the Adhesive on these distortions has often been overlooked. More experimental data are therefore necessary to properly understand its influence on process-induced strains and its behaviour during cure. The present paper reports a wide range of new experimental investigations showing the non-negligible influence of the Adhesive on cure-induced distortions of composite assemblies. The experimental data presented include post-cure distortion measurements, optical microscope imaging, micro-tomography imaging and FBG in-situ strain monitoring during an autoclave bonding process. These experiments demonstrate the impact of the Adhesive Film behaviour and of the manufacturing bonding process on final distortions and strains of composite assemblies.

  • Implementation of a Simulation Tool of Strains Induced During the Co-bonding of Autoclave-cured Parts
    , 2019
    Co-Authors: Philippe Olivier, Laure Moretti, Bruno Castanié, Léonard Serrano, Gérard Bernhart
    Abstract:

    Our on-going research focusses upon composite structural parts such as stiffened panels with co-bonded stringers. This study is aiming to developing a numerical tool based on commercial softwares (e.g. Abaqus ® and Fortran ®) enabling after-cure deformations to be predicted for co-bonded composite parts. Several simulations moduli were developed to describe i the thermochemical, ii the thermomechanical behaviours of prepreg plies and structural Adhesive Film and iii the mould/part interaction. An experimental work was conducted in parallel in order to get firstly simulation input parameters (i.e. material behaviour laws) and secondly experimental deformations on co-bonded composite specimen. The materials used were the Hexcel U.D. prepreg tape M21EV/IMA and the Cytec FM300M structural Adhesive Film. During a first step (first cure cycle), the process-induced strains of the laminated panel that will be stiffened with stringers were computed and compared to experimental ones. During the second step (second cure cycle) the process-induced strains and deformation were computed on the cured laminate but also on the stringer foot and on the structural Adhesive as shown in Fig. 1. Lastly comparing experimental results to simulations shows clearly the interest of considering a 2 steps manufacturing process with 2 cure cycles instead of a single one in which all the components (i.e. panel, Adhesive and stringer foot) are cured together.

Yongjin Li – One of the best experts on this subject based on the ideXlab platform.

  • investigations on the morphologies and properties of epoxy acrylic rubber nanoclay nanocomposites for Adhesive Films
    Composites Science and Technology, 2014
    Co-Authors: Lian Wang, Xiaoxue Shui, Xin Zheng, Yongjin Li
    Abstract:

    Abstract The epoxy/acrylic rubber (ACM)/montmorillonite (MMT) nanocomposites have been prepared by simple solvent blending. The morphologies, storage modulus, glass transition temperatures, and physical properties have been investigated systematically. The decreased sizes and increased numbers of the epoxy domains in the epoxy/ACM blends were observed with the incorporation of MMT. The crosslinked epoxy/ACM binary blends show partially miscible phase structure, while the epoxy/ACM/MMT nanocomposites exhibit a more complete phase-separated behavior and an increased Tg of epoxy phase. It was found that the catalytic effect of MMT on the crosslinking reaction of epoxy resiresin accounts for the more complete separation of the two phases. A novel crosslinking induced clay exfoliation has been observed for the ternary nanocomposites. More surprisingly, a synergistic effect of MMT on both toughness and tensile modulus of epoxy/ACM blend were observed, probably originated from the fine domain sizes and appropriate interface-dispersed MMT platelets in the ternary nanocomposites. The fabricated materials have been used as the Adhesive Films for polyimide Films and copper foils. The Adhesive strength of the binary epoxy/ACM blends was found to be dependent on the thickness of the Adhesive Films. Moreover, a preferable increment in the Adhesive property of epoxy/ACM/3 wt% MMT Adhesive Film was observed, resulting from the synergistic effect of the fine degree of crosslinking and tearing fracture of the Adhesive Film.