含缺陷点阵结构的力学性能影响研究

随着3D打印(增材制造)的快速发展以及航空航天对轻量化结构设计的迫切需求,多孔结构尤其是周期性的点阵结构得到了越来越多的重视。由于当前3D打印工艺水平还不够成熟,打印的点阵结构不可避免地出现各种缺陷,因此需要对含缺陷的点阵结构进行性能评估。首先开展了不同位置点阵杆件缺失对结构力学性能的影响,实验和有限元结果表明中心部位的单根杆件缺失时结构的力学性能下降最多。在此基础上,建立了中心部位杆件的缺失数量与结构力学性能之间的关系表达式。该结果可以为点阵结构在实际工程结构中的应用提供指导。

Study on Mechanical Properties of Lattice Structure With Defects

With the rapid development of 3D printing (Additive Manufacturing) and the urgent demand of aerospace for lightweight structure, porous structure, especially periodic lattice structure, has attracted more and more attention. In view of the fact that 3D printing technology is not mature enough and the printed lattice structure inevitably has defects, therefore, it is necessary to evaluate the performance of lattice structure with defects. Firstly, the influence of the missing of the strut in different positions on the mechanical properties of the structure is carried out. The experimental and finite element results show that the mechanical properties of the structure decrease most when a strut is missing in the center. Furthermore, the relationship between the number of missing members in the center and the mechanical properties of the structure is established. The results can provide guidance for the application of lattice structure in practical engineering structure.