On the interplay between roughness and viscoelasticity in adhesive hysteresis

Viscoelasticity and roughness are among the possible causes of adhesive hysteresis displayed by soft contacts. an increased effective work adhesion due to stiffening contact, while is responsible for elastic instabilities. Herein, we explore interplay between viscoelasticity simulating in two dimensions retraction a rigid cylinder, with wavy surface profile, from viscoelastic half-space. The wave amplitude length varied induce instabilities load–to–area response, velocity promote viscoelasticity. Results show that, regime where confined edges contributions waviness nearly independent additive. At low rates, load-area curve typical rough contacts suppressed viscoelasticity: contact stiffens stable decrease area load. This occurs minimal change adhesion. However, when instantaneous limit met at high mechanical appear.