Frictional Effects in Biomimetic Scales Engagement

TL;DR

This paper analytically investigates how dry Coulomb friction influences the nonlinear bending behavior of biomimetic scale-covered elastic substrates, revealing dual locking mechanisms and increased stiffness due to friction.

Contribution

It introduces an analytical model that captures the effects of friction on scale engagement, highlighting the dual locking mechanisms and their impact on nonlinear behavior.

Findings

Friction causes static and kinetic lock mechanisms.

Friction increases the overall stiffness of the structure.

Maximum frictional work occurs at intermediate friction coefficients.

Abstract

Scales engagement can contribute significantly to nonlinear bending behavior of elastic substrates with rigid biomimetic scales. In this letter, we investigate the role of friction in modulating the nonlinearity that arises due to self-contact of scales through an analytical investigation. We model the friction as dry Coulomb type friction between rigid links and the substrate is taken to be linear elastic. Our results reveal that frictional effects give rise to two possible locking mechanisms, namely static friction lock and kinetic friction lock. These locks arise due to a combination of interfacial behavior and geometry. In addition to these extremes, the frictional behavior is found to increase stiffness of the structure. This dual nature of friction which influences both system operation and its terminal limit results in the maximum relative frictional work to lie at intermediate friction coefficients and not at the extremes of frictional limits.