JKR model JKR theory Lennard–Jones Technology: general issues adhesion adhesion enhancement adhesion hysteresis basin of attraction bi-stability contact mechanics contact nonlinearities corrosion dissipation dynamic vibration absorber elbow erosion experiments finite element method friction friction testers friction-induced vibrations gas-solid flow interface stiffness mass-on-moving-belt multi-stability nonlinear dynamic response nonlinear dynamics numerical modelling numerical simulation passive vibrations mitigation rough surfaces