Modeling and performance study of lattice modeling of hollow variable section beam based on selective laser melting technology
Aiming at the problems of uneven force,unreasonable material distribution and single function of the lattice structure,a hollow variable section beam lattice was designed.The lattice was mainly composed of hollow variable section beam and crownless hollow sphere,which optimized the node connection mode and improved the material distribution.Compared with the traditional body center cubic lattice,it had many advantages.The structural geometric analysis of hollow variable section beam points was completed,and the functional relationship between lattice structural parameters and relative density and mechanical properties was derived based on the geometric data model of lattice and Timoshenko beam theory.A hollow variable section beam lattice with a single cell side length of 10 mm was designed and subjected to quasi-static compression simulation on a variable cross-section beam lattice with the same relative density but different curvature radii.The variable cross-section beam lattice was prepared using selective laser melting technology,and the morphology analysis and quasi-static compression test were carried out.The results showed that the compression simulation results were consistent with the trend of experimental results,and the hollow variable section beam lattice had better performance than the traditional body-centered cubic lattice,and the mechanical properties were the best when the radius of curvature of the outer contour was 4 mm,and the bearing capacity was increased by 43%compared with the ordinary lattice.The outer contour and inner hole finish of the variable section beam were high,and the deviation of the scanning extraction model was within 0.25 mm compared with the original model.
NETL
NSTL
万方数据
维普
