Vibration Characteristics of Additive Manufacturing Lattice Sandwich Hybrid Structure Filled with Damping Materials
Titanium alloy lattice sandwich beams were prepared by additive anufacturing(AM)technology,and silicone rubber was used as damping material to fill the lattice gap.The modal shapes of the lattice sandwich cantilever beam with or without filling were tested and compared,and the swept frequency vibration excitation test was carried out.The test results show that the filled damping material will not change the structural vibration mode,but significantly reduce the vibration response amplitude.The dynamic mechanical analysis(DMA)of silicone rubber was carried out,and the frequency domain viscoelastic model parameters were calibrated in combination with the generalized Maxwell model(GMM)viscoelastic model;the parameters of the polynomial form hyperelastic model were calibrated by the uniaxial tensile test of silicone rubber.Based on the viscoelastic model and calibration parameters,the finite element simulation of vibration response of lattice sandwich cantilever beam with filling is carried out,which is consistent with the experimental results.It is proved that the viscoelastic model and its parameter calibration method used in the paper can be effectively used to calculate the vibration characteristics of hybrid structures.
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