首页|Modeling and analysis of gradient metamaterials for broad fusion bandgaps
Modeling and analysis of gradient metamaterials for broad fusion bandgaps
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A gradient metamaterial with varying-stiffness local resonators is proposed to open the multiple bandgaps and further form a broad fusion bandgap.First,three local resonators with linearly increasing stiffness are periodically attached to the spring-mass chain to construct the gradient metamaterial.The dispersion relation is then derived based on Bloch's theorem to reveal the fusion bandgap theoretically.The dynamic char-acteristic of the finite spring-mass chain is investigated to validate the fusion of multiple bandgaps.Finally,the effects of the design parameters on multiple bandgaps are dis-cussed.The results show that the metamaterial with a non-uniform stiffness gradient pattern is capable of opening a broad fusion bandgap and effectively attenuating the lon-gitudinal waves within a broad frequency region.
local resonance mechanismelastic metamaterialstiffness gradientbandgap fusionbroadband wave attenuation
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