Abstract: In order to prevent air entrapment in the spacecraft, the honeycomb wall of composite honeycombs needs to be perforated when used. Therefore, the influence of the perforation on the equivalent modulus of the honeycomb needs to be considered in the simulation calculation, and a theoretical prediction method for the equivalent modulus of the composite honeycomb with perforations needs to be established. In this paper, the theoretical prediction formula for the equivalent flat compression modulus of the composite honeycomb with perforations is established based on the stress distribution formula of the anisotropic perforated plate under in-plane tensile and compressive loads. The theoretical prediction formula for the out-of-plane shear modulus of the composite honeycomb with perforations is established by the semi-analytical method. An approximate calculation method for the equivalent bending stiffness of the perforated plate is given and a theoretical prediction formula for the equivalent in-plane modulus of the composite honeycomb with perforations is established. In order to verify the validity of the theoretical model, the corresponding finite element analysis was carried out. The results show that the theoretical prediction results of the modulus under different apertures are in good agreement with the numerical simulation calculation results. The reliability of the theoretical model is verified. This paper takes the main bearing plate of a typical remote sensor as the application object, establishes a refined model and a three-dimensional solid equivalent model, and conducts modal analysis. The results show that the frequencies and vibration modes calculated by the two modeling methods are close, the maximum error is up to 4.4%. The research results of this article can provide reference for equivalent modeling of honeycomb with open cells in composite materials in engineering.

Key words: open-cells honeycomb, modulus, theoretical prediction, numerical simulation, modal analysis, composites