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    Geometric Nonlinearity Effects in the Response of Sandwich Wide Panels

    Source: Journal of Applied Mechanics:;2016:;volume( 083 ):;issue: 009::page 91008
    Author:
    Yuan, Zhangxian
    ,
    Kardomateas, George A.
    ,
    Frostig, Yeoshua
    DOI: 10.1115/1.4033651
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In the literature, there are various simplifying assumptions adopted in the kinematic relations of the faces and the core when considering a geometrically nonlinear problem in sandwich structures. Most commonly, only one nonlinear term is included in the faces and the core nonlinearities are neglected. A critical assessment of these assumptions, as well as the effects of including the other nonlinear terms in the faces and the core, is the scope of this paper. The comprehensive investigation of all the nonlinear terms is accomplished by deriving and employing an advanced nonlinear highorder theory, namely, the recently developed “extended highorder sandwich panel theoryâ€‌ (EHSAPT). This theory, which was derived as a linear theory, is first formulated in this paper in its full nonlinear version for the simpler onedimensional case of sandwich wide panels/beams. Large displacements and moderate rotations are taken into account in both faces and core. In addition, a nonlinear EHSAPTbased finite element (FE) is developed. A series of simplified models with various nonlinear terms included are derived accordingly to check the validity of each of these assumptions. Two sandwich panel configurations, one with a “softâ€‌ and one with a “hardâ€‌ core, loaded in threepoint bending, are analyzed. The geometric nonlinearity effects and the relative merits of the corresponding simplifications are analyzed with these two numerical examples. In addition to a relative comparison among all these different assumptions, the results are also compared to the corresponding ones from a commercial FE code.
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      Geometric Nonlinearity Effects in the Response of Sandwich Wide Panels

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    contributor authorYuan, Zhangxian
    contributor authorKardomateas, George A.
    contributor authorFrostig, Yeoshua
    date accessioned2017-05-09T01:25:47Z
    date available2017-05-09T01:25:47Z
    date issued2016
    identifier issn0021-8936
    identifier othermd_138_07_071101.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/160282
    description abstractIn the literature, there are various simplifying assumptions adopted in the kinematic relations of the faces and the core when considering a geometrically nonlinear problem in sandwich structures. Most commonly, only one nonlinear term is included in the faces and the core nonlinearities are neglected. A critical assessment of these assumptions, as well as the effects of including the other nonlinear terms in the faces and the core, is the scope of this paper. The comprehensive investigation of all the nonlinear terms is accomplished by deriving and employing an advanced nonlinear highorder theory, namely, the recently developed “extended highorder sandwich panel theoryâ€‌ (EHSAPT). This theory, which was derived as a linear theory, is first formulated in this paper in its full nonlinear version for the simpler onedimensional case of sandwich wide panels/beams. Large displacements and moderate rotations are taken into account in both faces and core. In addition, a nonlinear EHSAPTbased finite element (FE) is developed. A series of simplified models with various nonlinear terms included are derived accordingly to check the validity of each of these assumptions. Two sandwich panel configurations, one with a “softâ€‌ and one with a “hardâ€‌ core, loaded in threepoint bending, are analyzed. The geometric nonlinearity effects and the relative merits of the corresponding simplifications are analyzed with these two numerical examples. In addition to a relative comparison among all these different assumptions, the results are also compared to the corresponding ones from a commercial FE code.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleGeometric Nonlinearity Effects in the Response of Sandwich Wide Panels
    typeJournal Paper
    journal volume83
    journal issue9
    journal titleJournal of Applied Mechanics
    identifier doi10.1115/1.4033651
    journal fristpage91008
    journal lastpage91008
    identifier eissn1528-9036
    treeJournal of Applied Mechanics:;2016:;volume( 083 ):;issue: 009
    contenttypeFulltext
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