Analysis of the nonlinear characteristics of the bonding surfaces of the bolted structure

Bolted connections are extensively used in mechanical structures including spacecraft, aircraft and agricultural machine. When a bolted structure is subjected to external excitation, nonlinear phenomena such as sticking and slipping occur at the bonding surfaces, which have important effects on the performance of the connected structure. Therefore, in this paper, the restoring force function of the bonding surfaces of the bolted connection structure is derived based on improved Iwan model and the probability density distribution function of the slip force in the form of primary distribution, and then the restoring force-displacement hysteresis curve of the bonding surfaces under cyclic excitation loading is obtained. Finally, the nonlinear characteristics of the bonding surfaces of the bolted cantilever beam structure is investigated by simulation studies. The research results provide a significant reference for the nonlinear characteristic analysis of the bolted structure.