Modeling and analyzing the influence of slip velocity on joint surface

Abstract

Millions of joints are utilized in large-scale equipment to interconnect components. However, the intricate nonlinear mechanical behavior exhibited at joint interfaces poses challenges in accurately modeling equivalent joints. The Jenkins element with viscoelasticity is built upon the Iwan model, and a novel Iwan-Stribeck-RIPP (Reduced Iwan Plus Pinning) model is proposed to depict the slip velocity and pinning effects concurrently. Analytical expressions for force-displacement, energy dissipation-displacement, and force-energy dissipation under microslip and macroslip were derived. A joint interface experimental platform was constructed to reveal the influence of slip velocity on the joint interface. The results indicate strong alignment between the analytical solution of the Iwan-Stribeck-RIPP model and the experimental outcomes of the joint interface. Moreover, the model effectively captures both slip velocity and pinning effects. Introducing slip velocity into the new model promises to enhance the accuracy of force-displacement analysis at the joint interface. This enhancement is attributed to the inclusion of both frictional energy and kinetic energy dissipation resulting from the slip velocity in the analytical model of the joint structure.