Frictional effects in biomimetic scales engagement
Department of Mechanical and Industrial Engineering, Northeastern University - Boston, MA, 02115, USA
Received: 15 August 2015
Accepted: 11 February 2016
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's 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 the stiffness of the structure. This dual nature of friction which influences both the 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 the frictional limits.
PACS: 46.70.De – Beams, plates, and shells / 46.25.-y – Static elasticity / 46.55.+d – Tribology and mechanical contacts
© EPLA, 2016