Design And Performance Verification Of Bionic Ant Lattice Structure For Aerospace Bearing Structure By Additive Manufacturing

With the development of large spacecraft such as deep space probe,heavy rocket and large space telescope towards long distance and high load capacity,the related technology of structural lightweight will become an effective means to improve the structural load efficiency of space equipment.As the main bearing forms of aerospace structures,thin-wall structure and connected structure still have the following problems in the lightweight design and manufacturing process: First,the coupling effect of material distribution and multi-scale structure characteristics on component properties leads to difficulties in the performance design of component material and structure matching;Second,the mismatch between the traditional design method and the manufacturing process leads to difficulties in the manufacture of complex components.In order to solve the above problems,this paper proposes a design method to construct three-dimensional lattice structure with excellent mechanical properties by imitating ant leg configuration.Combined with structural optimization design,bionic lightweight structure design and three-dimensional bionic ant lattice structure filling optimization design,multi-scale lightweight structure design method,through the matching optimization design of materials and structures,By using additive manufacturing technology,the manufacturing and performance evaluation of bionic ant lattice structure were carried out,and the lightweight design of aerospace bearing structure was carried out to achieve the research objectives of high performance,high stiffness and low quality.The main research contents include:(1)Taking Black-gold Turkish Camponotus and Messor Structor as bionic objects,the bionic single cell structures based on the leg configuration of the ant are established.Based on the bionic cell structures,two kinds of bionic lattice structures,FFHBTC1 and TTHBTC1,are constructed according to their different stacking modes.Nylon,a non-metal material,is selected to fabricate the bionic lattice structure.The mechanical properties of the bionic ant lattice structures FFHBTC1 and TTHBTC1 based on nylon material are verified by simulation and experimental analysis.(2)Aluminum alloy,a commonly used metal material in aerospace equipment structural components,is chosen as the follow-up research object to conduct research on the mechanical properties of 7075 aluminum alloy biomimetic ant lattice structure based on additive manufacturing.The key printing parameters of 7075 aluminum alloy are obtained by studying the powder characteristics and process strategy,and the bionic ant lattice structures TTHBTC1 and FFHBTC1 based on 7075 aluminum alloy are fabricated by laser powder bed melting(LPBF)technology.The mechanical properties of TTHBTC1 and FFHBTC1 bionic ant lattice structures based on 7075 aluminum alloy are verified by experiments and simulation.(3)The mechanical properties of Ti6Al4 V titanium alloy bionic ant lattice structure based on additive manufacturing technology are studied by selecting titanium alloy,which is commonly used in aerospace bearing structures and has excellent mechanical properties.The powder characteristics,powder forming strategy,forming quality and internal defects of Ti6Al4 V titanium alloy are systematically studied,and the printing process strategy and process parameters suitable for Ti6Al4 V titanium alloy are determined.Laser powder bed melting(LPBF)technology is used to fabricate TTHBTC1 and FFHBTC1 bionic ant lattice structures based on Ti6Al4 V titanium alloy.The mechanical properties of TTHBTC1 and FFHBTC1 bionic ant lattice structures based on Ti6Al4 V titanium alloy are verified by experiments and simulation analysis.(4)Research on multi-scale bionic optimization design of space bearing structureconnector structure is carried out.Taking the structure of an aerospace theodolite connector as the research object,combined with structural optimization design and three-dimensional bionic lattice structure filling optimization design,the optimized design of theodolite connector is completed,and the effectiveness of bionic ant lattice structure TTHBTC1 based on titanium alloy is verified in the lightweight design of aerospace connector structure.(5)The multi-scale bionic optimization design of space bearing structure-thin-wall structure is studied.Taking the vertical support of the wide-angle Aurora Imager as the research object,the multi-scale bionic optimization design of the structure is completed by combining the structural optimization design,the biomimetic lightweight design of the vertebrate femur and the three-dimensional bionic lattice structure filling optimization design technology,and the manufacturing of the complex bearing structure is realized based on the additive manufacturing technology.To verify the effectiveness of bionic ant lattice structure TTHBTC1 based on titanium alloy in lightweight design of aerospace thin-wall structures.