Abstract
In this paper, the effect of height h of the hexagonal honeycomb core on the elastic modulus is studied by using numerical results of finite element method. For honeycomb subjected to in-plane loading, there exist deformations in the height direction for cell walls due to effect of Poisson's ratio. Because these deformations are different for adjacent walls if they are not joined together along the common edge, the in-plane stiffnesses should be analyzed as a 3-dimensional problem, in which the deformations in the height direction are considered. Also it is shown that there is no influence of height to the elastic moduls for the honeycomb under the plane strain condition. Based on this fact, an equation to calculate elastic modulus in the direction of apex E2 from their values under the plane strain condition is proposed, and its validity is verified by using numerical results of FEM.
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