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• Damping performance of lattice structure is obtained by a series of experiments. • A bi-material lattice is designed by filling the metal lattice with epoxy material. • An inverse method is proposed to obtain the loss factor of in-situ epoxy material. • Local damping model is proposed for the lattice structure with locally filled epoxy material. Lattice structure is widely used to achieve lightweight while damping is an indispensable property for evaluating the dynamic properties of lattice structures. This paper studies the damping performance of the lattice structures by experiments and analysis. A series of lattice specimens including single-material and bi-material lattices are prepared. The bi-material lattice is designed by filling the metal lattice with epoxy material. By this way, the stiffness of the bi-material lattice is guaranteed, and the effect of vibration absorption is realized at the same time. Different from the traditional proportional damping method of single-material structure, the non-proportional damping model is used for the bi-material lattice structure. The homogenization method is used to calculate the equivalent complex modulus of the lattice. An inverse method is proposed in this paper to obtain the loss factor of in-situ epoxy material filled in the metal lattice. Finally, lattice specimens with local damping are prepared and tested, and the experimental and simulation data are compared.
Wang et al. (Sat,) studied this question.
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