MODEL CONSIDERING RESIDUAL STIFFNESS AND STIFFNESS DISCONTINUITY OF BOLTED JOINTS

The nonlinear dynamic behavior has an important impact on energy dissipation and vibration damping characteristics of bolted joints. Firstly, the development of tangential dynamic models is summarized and analyzed. Secondly, a five-parameter Iwan model based on a truncated power-law distribution is proposed. The backbone and hysteresis curves are obtained. Thirdly, normalized and dimensionless analysis is performed. On the basis of the above, a more concise four-parameter Iwan model with stiffness continuity is proposed. Finally, the validity of the model is verified by comparing the energy dissipation vs excitation force amplitude curve with the experimental data.