The friction effects in the stick-slip phenomena of the human skin

In tribosystems that include contact with a flexible body, friction-induced vibration may be present. Dimensionless analysis coupled with numerical manipulation was employed to model the discontinuity between the static and kinetic behaviour of the friction. The present paper discusses the nature of stick-slip between a human fingertip and standard printing paper, intending to describe the theoretical stability conditions of movement. The amplitude of the stick-slip phenomenon is analised as a function of the human skin's rheological and tribological properties, the system's rigidity, and the sliding contact velocity.