Research On Damping Characteristic Of Composite Material With Periodic Micro-truss Structures

Sandwich structure with truss cores is a kind of composite material structure with ordered lacunaris microstructures. It is designed by simulating the molecular lattice structures, such as tetrahedron structures, pyramid structures and so on. Considering the potential ability of this structure to absorb the energy and vibration, we established a composite material model with periodic micro-truss structures, and applied a kind of high damping material such as rubber to fill the lacunas. We researched on damping characteristic of the structure by simulating the vibration response of the model.Firstly, the finite element model of sandwich structure with tetrahedron truss cores is established, and put on harmonic analysis on this model. Secondly, based on this model, we establish the finite element model of composite material by filling the lacunas with the high damping material, and simulate the vibration responses of different nodes, which are chosen from the top surface to the bottom surface of the model. Finally, In order to further develop the potential damping characteristics of the structure, a centralized mass is applied to the center of each tetrahedron element of the above model, and the vibration response of the new model is analyzed.Plot the Amplitude-frequency curve of the chosen nodes in the three models, and analyze the damping characteristic of the three models by comparing the vibration response of the same node in different models. Through the contrast, we can conclude that the composite material model has the better performance of energy absorbing and shock absorption, however, the composite material model with centralized mass has more significant advantages.