EQUIVALENT ELASTIC PARAMETERS OF THE HONEYCOMB CORE
蜂窝芯层的等效弹性参数

The result of Gibson's formula that describes equivalent elastic parameters of cellular material is simple and applied easily. However because the stiffness corresponding with extension or contraction deformation of honeycomb wallboard is neglected, it causes indeterminedness shown by the elastic matrix of material of core in numeral analyzing honeycomb sandwich panels. In this paper it is again discussed that the influence of extension or contraction deformation of honeycomb wallboard on in-plane stiffness 5 and the Gibson's formula is corrected. Not only the results in this paper overcome the shortcoming of the Gibson's formula, but also a simplified scheme to consider in-plane stiffness of honeycomb core is proposed. This scheme can be easily applied to calculate honeycomb sandwich structures.