| The spacecraft is equipped with expensive scientific instruments and data collection equipment,the spacecraft will collide with the surface of the planet when it lands,the main buffer system in the leg-type lander has a buffer energy-absorbing structure,the effect of its energy absorption determines whether the equipment in the aircraft can be protected.Therefore,the research on the crashworthiness of the buffer energy absorption structure in the landing leg is of great significance.The leg-type lander’s buffer energy-absorbing structure generally adopts a thin-walled metal tube structure or an alum inum honeycomb structure.With the development of science and technology,a high-intensity and light-weight buffer energy-absorbing structure is required to realize the lightweight of the aircraft.The three-dimensional lattice structure of metal has good mechanical properties,but the triply periodic minimal surface lattice structure has not been used as a buffer energy absorbing structure in the landing leg.This research work will be carried out from several aspects:(1)CX stainless steel was selected to print the tensile test specimens for testing the performance parameters of the material through 3D printing technology,and the TPMS structure for testing the mechanical properties of the overall structure was also printed and manufactured.The data obtained through finite element simulation calculations were compared with experimental data to verify the accuracy of the modeling method.(2)TPMS is a porous structure that changes periodically in three directions: X,Y,and Z in three-dimensional space.In this paper,three configurations of the TPMS lattice structure are studied,and the influence of the structure thickness value t and the function value C that affects the shape of the structure on the crashworthiness of the TPMS lattice structure is analyzed.Then,the lattice structure of these three configurations is optimized to obtain the structure with the best impact resistance.(3)According to the optimized design,the TPMS lattice structure with the best crashworthiness was obtained,and it was used as the buffer energy-absorbing structure of the leg-type lander.According to the results of simulation calculations,the force-displacement curves of AA6061 T6 aluminum alloy and CX stainless steel selected for the TPMS lattice structure are compared.They both meet the load requirements of the landing leg.The results show that this new structur e can be used as a buffer energyabsorption structure in the lander. |
