Study of equivalent mechanical parameters out-of-plane of wave-absorbing honeycomb panel and core layer
Obtaining the mechanical properties of wave-absorbing cell wall is an important basis for studying its cutting mechanism and optimizing the cutting process parameters.Due to the characteristics of the preparation process of the absorbing honeycomb and the material properties of the impregnated layer,the mechanical parameters of the panel obtained by the traditional equal wall thickness cell model cannot accurately reflect the mechanical properties of the absorbing honeycomb panel.In this paper,a Y-type cell model with variable thickness is proposed.Based on the principle of equivalent mechanical properties,the mapping relationship between the mechanical parameters of the cell wall and the equivalent mechanical parameters of the absorbing honeycomb is established by using the energy method.The structural parameters of the variable thickness Y-type cell are determined by image processing technique,and the three-dimensional model of the absorbing honeycomb is established by using the periodic array of the variable thickness Y-type cell.Simulation results of the out-of-plane elastic modulus and out-of-plane shear modulus of the honeycomb core are compared with the experimental results,which are not more than 5％.The ultrasonic cutting simulation of absorbing honeycomb based on variable thickness Y-type cell and equal wall thickness cell is carried out respectively.Compared with the experimental results,the error of the main cutting force direction of the former is 13.67％,and the latter is as high as 47.8％.The research work provides a theoretical basis and a new research method for the study of mechanical properties,cutting mechanism and optimization of processing parameters of honeycomb composites with uneven wall thickness distribution.
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