| Due to its excellent specific strength,specific stiffness,shock absorption and energy absorption,the lattice structure has a very broad application prospect in aerospace,automobile manufacturing,medical and other fields.With the rapid development of additive manufacturing technology,more and more experts and scholars have turned their attention to the integrated design and manufacturing of components with complex lattice structures.In this paper,based on the mechanical characteristics of the BCC lattice structure in the quadrangular pyramid lattice structure,the optimization design is carried out,and the variable density lattice filling design of the quadrangular pyramid lattice structure is studied,and finally it is applied to the low pressure valve block of the aviation EHA Lightweight design.The main research contents of this paper are as follows:Firstly,in view of the stress characteristic of BCC lattice structure mainly concentrated in the joint region,the joint region reinforced configuration,namely S-GBCC lattice configuration,was proposed,and its mathematical model was established to analyze the influence mechanism of structural parameters on its mechanical properties.Secondly,based on the SLM technology,the S-GBCC lattice configuration samples with different parameters were produced,and the topography was analyzed,and the static compression test was completed to verify the correctness of the analytical model.Established the S-GBCC lattice solid model,completed the finite element analysis of the solid model,and verified the accuracy of the simulation model compared with the experimental results;proposed a new beam element fitting simulation for the S-GBCC variable cross-section lattice structure The method improves the calculation efficiency of simulation analysis of variable cross-section lattice structure.Thirdly,using the hexahedral mesh technology in finite element,a variable density design method based on discrete unit volume and topology optimization is proposed,and the variable density lattice filling of the quadrangular pyramid lattice structure is realized through the secondary development of the software.The integrated operation system of variable-density lattice modeling and simulation is developed,and the filling effect is verified through simple numerical examples.Finally,the finite element modeling and topology optimization analysis of the aviation EHA medium and low pressure valve block are carried out,and the variable density lattice filling method of the quadrangular pyramid lattice structure is used to carry out a lightweight design,and its performance parameters are analyzed through finite element simulation,Meet the design requirements. |
