Study on Compressive Properties of Three Types of Aluminum Alloy Honeycomb Panels

Inspired by the fact that the front wing of Unicorn contains both a column and an air bag wall structure,the traditional aluminum alloy honeycomb panel is improved in this paper.A column structure is set at the end of the honeycomb wall of the aluminum alloy honeycomb panel core panel,that is,a wall end column beetle panel.Because about 10% of the columella in the front wing of Unicorn Fairy distributed in the middle of the honeycomb wall,the columella in the middle of the honeycomb wall was added for joint research.Three kinds of plates are taken as the research object to carry out test and finite element analysis.In order to fully simulate the performance of the integrated molded honeycomb panel and consider that the 3D printing technology cannot print aluminum alloy materials,the resin is used as the material in the experiment,and the 3D printing technology is used to make the integrated honeycomb panel specimen for testing to verify the accuracy of the computer simulation.In the experiment,three different configurations of honeycomb panels,namely,traditional honeycomb panel,wall center pillar beetle panel and wall end pillar beetle panel,were made with resin materials through 3D printing technology,and side pressure tests were carried out on them.It can be seen from the experimental data that the ultimate lateral compression bearing capacity of the wall end post beetle board is increased from 27.9 kN to 34.7 kN compared with the traditional honeycomb board;compared with the traditional honeycomb panel,the lateral compression ultimate bearing capacity of the wall pillar beetle panel is increased from 27.9 kN to 31.9 kN.It can be seen that the lateral pressure performance of wall end post beetle board is better than that of honeycomb board and wall center post beetle board.Secondly,the finite element model was established to compare with the experimental data for verification.Due to the influence of the holes left by the 3D printing process,the failure form of the test piece was slightly different from the stress distribution of the finite element model,but the low stress area in the center of the upper and lower edges of the plate was the same as the experiment.It can be seen from the comparison between the finite element simulation value and the experimental value that the average error between the simulation results and the experimental results is only 3.366%,which verifies the validity of the finite element model.Thirdly,three kinds of honeycomb panel finite element models based on aluminum alloy material properties were established,and the side pressure finite element analysis was carried out.The results show that compared with the traditional honeycomb panel,the yield bearing capacity and ultimate bearing capacity of the wall end post beetle panel are improved by 2.6% and 4.7% respectively.Finally,the four factors that affect the lateral compression performance of the beetle board,namely,the ratio of the column radius r to the side length L of the hexagonal honeycomb core α,the thickness of the beetle board core layer h₁,the thickness of the upper and lower panels h₂,and the thickness of the beetle board core layer honeycomb wall d,were compared and analyzed.Among them,the diameter length ratio increased from 0.312 5 to 0.5,the yield bearing capacity and the ultimate bearing capacity increased by 5.3% and 6% respectively;the wall thickness of the core layer of the beetle board increased from 1mm to 1.4mm,and the yield bearing capacity and ultimate bearing capacity increased by 3.3% and 6.5% respectively;the thickness of the core layer of the beetle board increased from 6 mm to 12 mm,and the yield bearing capacity and ultimate bearing capacity increased by 2.2% and 5.1% respectively;the thickness of the surface layer of the beetle board increased from 1 mm to 2.5 mm,and the yield bearing capacity and ultimate bearing capacity increased by 244% and 236% respectively.It is concluded that the thickness of the beetle board panel has a significant impact on the side pressure performance.