CONTACT INTERFACE PARAMETER IDENTIFICATION OF BOLTED JOINT STRUCTURE WITH UNCERTAINTY USING THIN LAYER ELEMENT METHOD

An approach to identifying the contact interface parameters of bolted joint structure with uncertainty is proposed in this paper. Thin layer element theory is firstly adopted to parameterize the contact interface, and then the parameters of thin layer element are identified using the uncertain parameter identification approach. Simulation is conducted to verify the proposed method based on an experimental model, which is an assembled structure with four bolted joints. Adopting the Monte-Carlo sampling method to construct test samples, numerical simulation results show that when considering the uncertainty in contact interface parameters of bolted joint structure, the proposed uncertain parameter identification method can be used to accurately identify the mean value and the standard deviation of the elastic modulus, the normal and tangential stiffness of the contact interface are simulated with satisfactory. The dynamical finite element model with statistical significance can be constructed at the same time.