Identification of nonlinear bolted lap joint models

Lap joints have significant influence on the response of structures due to their localised nonlinear stiffness and damping. In this paper, dynamic behaviour of bolted joints is modelled and their parameters are identified using experimentally measured data. A thin layer of virtual elasto-plastic material is used to model the joint contact interface. In identification of the thin layer parameters, nonlinear responses measured at constant force amplitudes are used. The identified model predictions at different load levels are compared with corresponding measured responses. Good agreement is achieved between the two sets indicating successful parameterisation and identification of the joint interface model.

► A thin layer interface element is employed to model bolted joints in structures.
► A virtual elasto-plastic material behaviour is adapted for the interface layer.
► The virtual material simulates the interface stick-micro/macro-slip behaviour.
► Parameters of the interface material are identified using experimental observations.