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Biomimetic scale-covered substrates are architected meta-structuresexhibiting fascinating emergent nonlinearities via the geometry of collectivescales contacts. In spite of much progress in understanding their elasticnonlinearity, their dissipative behavior arising from scales sliding isrelatively uninvestigated in the dynamic regime. Recently discovered is thephenomena of viscous emergence, where dry Coulomb friction between scales canlead to apparent viscous damping behavior of the overall multi-materialsubstrate. In contrast to this structural dissipation, material dissipationcommon in many polymers has never been considered, especially synergesticallywith geometrical factors. This is addressed here for the first time, wherematerial visco-elasticity is introduced via a simple Kelvin-Voigt model forbrevity and clarity. The results contrast the two damping sources in thesearchitectured systems: material viscoelasticity, and geometrical frictionalscales contact. It is discovered that although topically similar in effectivedamping, viscoelsatic damping follows a different damping envelope than dryfriction, including starkly different effects on damping symmetry and specificdamping capacity.

Material-Geometry Interplay in Damping of Biomimetic Scale Beams