Gradient lattice structure for additive manufacturing and design method thereof

Abstract

The invention relates to the field of spaceflight, in particular to a gradient lattice structure for additive manufacturing and a design method thereof. The embodiment of the gradient lattice structure comprises multiple stages of layered lattices sequentially connected in the preset direction, and each stage of the layered lattices comprise at least one lattice cell unit; and each lattice cell unit comprises multiple rod parts, the multiple basic rod parts intersect at one point, and the lattice cell unit has the triple or quadruple or sextuple spatial rotation symmetry in the preset direction of the intersection points. In the preset direction, the gradient of the configuration of each lattice cell unit in each stage of the layered lattices is increased relative to the configuration of each lattice cell unit in the last stage of the layered lattices. The gradient of the configuration of each lattice cell unit in each stage of the layered lattices is increased relative to the configuration of each lattice cell unit in the last stage of the layered lattices, therefore, the strength and the rigidity of the layered lattices are improved step by step, and performance gradient changesof the whole gradient lattice structure are achieved.

Description

technical field [0001] This application relates to the field of aerospace, in particular, to a gradient lattice structure oriented to additive manufacturing and a design method thereof. Background technique [0002] The lattice structure has good cushioning and energy-absorbing characteristics, and can be used as a landing cushioning and energy-absorbing structure for spacecraft, while the gradient lattice structure has the advantages of high energy-absorbing density, small recoil force, and easy integrated forming of additive manufacturing. It is considered to be one of the most potential next-generation spacecraft energy-absorbing buffer structures. [0003] The existing buffer energy-absorbing gradient lattice structure generally realizes the performance gradient design in two ways: [0004] One approach is to regulate the diameter of the rods of the lattice cells, that is, keep the external dimensions of each lattice cell constant, and only change the diameter of the ro...

AI Technical Summary

Problems solved by technology

[0006] However, at present, due to the limitation of the minimum characteristic size of the formed structure with stable mechanical properties in additive manufacturing, the lattice structure can be manufactured with the same equipment, and the diameter of the lattice cell rod and the outer envelope size of the lattice cell can only be Limited to a narrow size range, resulting in too thin rods or too small lattice cells in an engineering structure of a given macroscopic size, which is feasible in design, but cannot be manufactured

Images