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Finite element modelling of sandwich panels with graded core under various boundary conditions

机译：不同边界条件下带渐变芯夹芯板的有限元建模

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摘要

Sandwich panels are widely used in the aerospace industry instead of solid plates due to their high flexural stiffness-to-weight and flexural strength-to-weight ratios. However due to the mismatch of properties between the face sheets and the core, stress concentrations can occur at the face sheet/core interfaces, often leading to delamination. One possible solution to this problem is the introduction of a graded core - a core in which the properties vary gradually from the face sheets to the core centre, eliminating any abrupt changes in properties. In this paper a 3D finite element method, fully validated through comparison with results from the literature and a 3D elasticity solution, is applied to modelling of sandwich panels with graded core. The approach makes use of graded elements to study the effect of varying the boundary conditions on the elastic deformation of the panel subject to uniformly distributed loading. Comparative analysis of stress and displacement fields in sandwich panels with homogeneous and graded cores is carried out under various combinations of simply supported, clamped and free edges.
机译：夹芯板由于其高的挠曲刚度对重量和挠曲强度对重量比而被广泛用于航空航天工业，而不是实心板。然而，由于面板和芯部之间的特性不匹配，应力集中会在面板/芯部界面处发生，经常导致分层。解决此问题的一种可能的解决方案是引入渐变磁芯-这种磁芯的特性从面板到磁芯中心逐渐变化，从而消除了特性的任何突然变化。本文通过将3D有限元方法与文献结果和3D弹性解决方案进行比较，充分验证了该方法，该方法可用于带渐变芯的夹心板的建模。该方法利用渐变元素来研究改变边界条件对承受均布载荷的面板弹性变形的影响。在具有简单支撑，夹紧边缘和自由边缘的各种组合下，对具有均质和渐变芯的夹芯板的应力和位移场进行了比较分析。

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  • 来源
    《The Aeronautical Journal》 |2012年第1186期|1289-1314|共26页
  • 作者

    M. Kashtalyan; B. Woodward;

  • 作者单位

    Centre for Micro- and Nanomechanics (CEMINACS), School of Engineering University of Aberdeen Aberdeen, UK;

    Centre for Micro- and Nanomechanics (CEMINACS), School of Engineering University of Aberdeen Aberdeen, UK;

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