Mechanical property analysis of a novel peel-speed sensitive flexible fastener

Abstract

A design of peel-speed sensitive flexible fastener was proposed based on a novel modified polyurethane. Taking the microtrichia of the head-arrester system of lestes barbarous as the bionic prototype, the structure of the micro protuberance was designed as self-mating type with hemispherical caps. Considering the nonlinearities of contact behavior and of the material property, a micromechanical model of typical interlocking element is established. Adopting the explicit dynamics finite element method, the mechanical responses of fastener in peeling are analyzed. The detachment of interlocking element is predicated by taking the total strain energy as an indicator. The influences of peel speed and friction coefficient on the mechanical performances are parametrically studied. The results show that the maximum peel force and the strength increased with respect to the enhancing peel speed because of the intrinsic nonlinearity in the constitutive relation of novel modified polyurethane the investigation adopted. With larger friction coefficient, the maximum peel force, the total strain energy and the corresponding de-adhesion displacements are respectively enhanced.