Introduction of the linear contact model in the dynamic model of laminated structure dynamics: An experimental and numerical identification

A numerical model of a laminated stack's dynamics applicable to general laminated structures was developed. A simple linear contact model facilitated the computational efficiency and in this way enabled the modelling of the stack's dynamics using a large number of laminas. The numerical model employs contact elements characterized by stiffness and damping parameters in a tangential contact direction and nonlinear contact stiffness in a normal contact direction. In order to identify the contact element parameters and to validate the developed numerical model of the laminated stack, several stack configurations were investigated using experimental modal analysis. The identified modal parameters were used in the optimization process to extract the contact element parameters. This made it possible to analyse the effects of the steel type, producer type, additional silicon layers and other treatments on the laminated stack's dynamics.

► Eighteen different laminated stack configurations were analysed.
► In development of a numerical model every lamina was modelled.
► Interlaminar contact was modelled using beam and link elements.
► Same type of electrical steel from different manufactures has different properties.