Dynamic characterization and numerical modelling of automotive rubber connections

A hybrid numerical-experimental methodology for the dynamic characterization of automotive rubber connections is presented. In order to predict the dynamic response of automotive structures, a finite element (FE) modelling approach is often used. A critical factor in the achievement of accurate dynamic or static predictions is modelling of non-linear connections between closures and car body. An experimental method is proposed for characterizing the dynamic behaviour of automotive weather strips. By means of a dedicated test bed, a frequency-dependent model of complex stiffness is identified for both normal and tangential loading conditions. The stiffness variability with quasi-static deformation amplitude and deformed shape is also investigated. The experimental data are then used to identify a linear FE model of vehicle rubber connections within the range 0-300 Hz. A simplified car door model and frequency response function (FRF) correlations are used to obtain an experimental validation of the proposed modelling approach.