An Investigation on 3d Printing Board Lattice Structure Material

Abstract
Structural lightweight design is the process of reducing the amount of material in a component to reduce its overall weight without sacrificing reliability or function. It is the most common application in aerospace, automotive manufacturing and Marine ships, and has received extensive attention from the industry and academia. TPMS combined with 3D printing technology can realize the integrated production of porous structures, solve the problem of processing micro-size material components, and is an important technical support in the process of structural lightweight. In this paper, by designing different TPMS porous structures and optimizing the 3D printing parameters process, polylactic acid (PLA) was successfully printed by material fusion deposition molding (FDM) method, and the tensile and compression characteristics of different structures were analyzed through mechanical properties testing. The experimental results show：

The print specimen is divided into three stages in the whole tensile process, which are elastic stage, yield stage and fracture stage, and the failure form is brittle failure. Among them, the tensile properties of D structure are the best, while the tensile properties of F-RD structure and N structure are relatively poor.
The printed specimen has two forms in the whole compression stage process, FRD structure and D structure have three stages, that is, the rising stage, the gentle stage, the second rising stage, and the N structure has only two stages, that is, the rising stage and the second rising stage. Among them, F-RD structure and D structure have relatively good compression performance, The shape variables are all about 55% under 13MPa, while N structure has poor compression performance, At 13MPa, the shape variable is only 15%.
The type D sample has horizontal pore type, the more uniform the stress is, and the lower the number of stress concentration sites in the same position interface, the better tensile and compressive properties. FRD sample has large pores, but the number is small, the force is more uniform, and the overall tensile and compressive properties are slightly lower than D sample. N-type samples have the largest number of pores, small pores and large distribution area. In the same section, there are many stress concentration locations, which seriously affect the tensile and compressive properties, so the N-type tensile and compressive properties are the worst.