Abstract:

The energy dissipation characteristics of bolted joints under dynamic loading is of great importance for describing the complex mechanical properties of mechanical system. Here, the hysteresis nonlinearity model of bolted joints is established by the equivalent Bouc-Wen model and the corresponding calculation method of energy dissipation and the identification method of Bouc-Wen model are presented. In order to verify the correctness of the methods, the experiment data of bolted joints is obtained by simulation of Mindlin model. The parameters of the Bouc-Wen model are identifed, and the energy dissipation characteristics of bolted joints are obtained with different forces controlled. The simulation results showed that the dimensionless tangential load increase as the energy dissipation nonlinear increase. The parameters of the Bouc-Wen model have influence on the energy dissipation that is related to its sensitivity, the more sensitivity, the larger incremental rate of the energy dissipation. The parameters (A, γ andn) of the Bouc-Wen model increases as the energy dissipation separation increases, but the parameterγ the opposite. The energy dissipation characteristics of bolted joints is relevant to the parameters of the Bouc-Wen model, excitation frequency and amplitude. The relationship between the dimensionless tangential load and the energy dissipation can be expressed asη=aΓ^b.

Key words: Bouc-Wen model, energy dissipation characteristics, parameters identification, bolted joints