Accurate Prediction of Thermal Deformation of Honeycomb Sandwich Panels.

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  • ハニカムサンドイッチパネルの高精度熱変形予測
  • ハニカムサンドイッチパネル ノ コウセイド ネツ ヘンケイ ヨソク

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Abstract

This paper is to show an accurate method to predict thermal deformations of honeycomb sandwich panels having composite skins. First of all, problems of the conventional method with utilizing the laminate theory are pointed out. In order to develop an effective predicting method, a model of a detailed structure of a unit cell of a sandwich panel is developed utilizing the 3-D finite element method. A periodic boundary condition is introduced to the model to represent the repetitive structures of the sandwich panel. The effective elastic modulus of the cell foil is obtained from the result of an out-of-plane compressive test on the honeycomb core. The adhesive between the skin and the core is modeled with considering its shape and quantity. The difference between the CTE according to this model and the actually measured figure is approximately 0.1×10-6/K. The paper further attempts to explain the anisotropic character of the sandwich panel. The result of the analysis suggests that the direction-dependency of the CTE is underestimated with the fact that the effective elastic modulus at a portion where a ribbon is bonded with another ribbon is different from the effective elastic modulus at a portion where the ribbon is on its own.

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