Summary
Wave dynamics of viscoelastic metamaterials, governed by their architecture, is strongly influenced by viscous losses in the constituent materials. These losses have not been properly quantified yet for additively manufactured metamaterials. This work presents a thorough characterization of the viscoelastic properties of additively manufactured polymers and analyzes the dynamics of metamaterial structures made of them, both numerically and experimentally. In particular, we performed the dynamic mechanical thermal analysis and tensile testing for two polymers commonly used in FDM 3D printing and employed the obtained master curves for the complex elasticity moduli in FEA simulations of a simple viscoelastic metamaterial. The calculation results were validated in transmission measurements using non-contact ultrasonic laser vibrometry. Our findings shed light on the peculiarities of wave control in viscoelastic additively manufactured metamaterials and form a basis for reliable prediction of their dynamic behavior at (ultra)sonic frequencies.
