04.2 - Aerostructures Design, Structural Dynamics, Aeroelasticity
STUDY ON THE OUT-OF-PLANE COMPRESSION PROPERTIES OF MULTISTAGE TITANIUM ALLOY LATTICE METAMATERIALS AT 350°C
H.Y. Huang¹, D. Wang¹, X.F. Du¹, Y.X. Xu¹; ¹School of Aeronautics, Northwestern Polytechnical University, China
Lattice metamaterials can meet the requirements of integrated design of structure and function of future aircraft. However, single-stage lattice metamaterials are prone to buckling at low relative density and thus lose their bearing capacity, while multistage lattice metamaterials can effectively improve the overall mechanical properties of the structure by increasing secondary rods. In this paper, based on single-stage pyramid lattice metamaterials, titanium alloy multistage pyramid lattice metamaterials are designed and fabricated by 3D printing technology. Then, through the out-of-plane compression performance test and numerical simulation of the structure at room temperature (25°C) and high temperature (350°C), the mechanical properties and damage evolution of the structure at different ambient temperatures are obtained. The result shows that compared with the single-stage lattice, the heat exchange area of the multistage pyramid lattice metamaterial designed in this paper increases by 116.51%, the ultimate strength increases by 1.51% at room temperature, and the ultimate strength increases by 12.06% at 350°C. Overall, the multistage lattice can delay the buckling of the structure due to the support of the internal secondary core, moreover increase the heat exchange surface area, so the multistage lattice has excellent bearing/thermal protection integration performance.