Analysis of bolt bonding surfaces by the finite element method based on the equivalent Iwan model

Abstract

Aiming at the force-displacement relationship and its energy dissipation of the bolted bonding surface under the action of small-amplitude tangential displacement, a finite element model with the Iwan model is established and used to investigate the stiffness and energy dissipation phenomena of the bolted bonding surface. First, the force-displacement relationship of the Iwan model is converted into stress-strain relationship through the hybrid hardened intrinsic model, and the subroutine based on UMAT and UHARD realizes the elastic-plastic change of the Iwan model during the contact of the bonding surface in the finite-element model of the stress-strain representation; then, the three-dimensional modeling and the joint simulation of the subroutine are carried out by using the ABAQUS finite-element software; finally, through the experimental data, the validity is verified, and the effects of multiple factors on the bolt bonding surface are analyzed. Finally, the validity is verified by experimental data to analyze the influence of multiple factors on the force-displacement relationship of the bolt bonding surface, and the polynomial function of the loading and unloading curves is established by using the interpolation fitting method to explore the energy dissipation phenomenon of the bolt bonding surface. The results show that the finite element method can accurately reflect the hysteresis and energy dissipation phenomenon of the force-displacement relationship of the bonding surface, and has the ability to investigate the relevant influencing factors. Through this study, it provides a basis for the study of the finite element method of the bolt bonding surface.