Model Order Reduction of Assembled Structures with Localized Nonlinearities in Transient Dynamic Analysis
Résumé
The dynamical simulation of assembled structures with bolts or rivets is a complex task due to a large number of subcomponents and the nonlinear interactions between them. The objective of this work is to develop an efficient numerical method to predict the time responses of assembly with localized nonlineartities in the transient regime. Modeling full contact is computationally expensive, especially when multiple resolutions of the model are required, such as in parametric studies, and thus needs to be optimized. This work neglects disbonding between contact surfaces, considering only the tangential behavior mainly responsible for the damping effect. The Iwan 1D element is extended to 2D to take account of this phenomenon in the contact planes. Moreover, a substructuration approach is used to reduce the computational cost of the model. This strategy is applied to a riveted subassembly of an aircraft stabilizer, reducing computation time compared to the full-order model or a highly detailed contact model, which would not be feasible within a reasonable time.