A method to analyse the nonlinear dynamic behaviour of rubber components using standard FE codes

摘要

For filled elastomers damping is caused by two different mechanisms at material level, resulting in viscous (rate dependent) and frictional (amplitude dependent) damping respectively [1,3]. In the one-dimensional case this can be modelled with a rheological model consisting of a viscoelastic component coupled in parallel with an elastoplastic component according to Fig. 1. Constitutive models for rubber used in standard FE codes are usually either hyperelastic or viscoelastic. Elastoplastic models, needed to model the frictional damping, are also normally supplied in order to model the plastic behaviour of highly stressed metal. The aim of this work is to propose an FE procedure that is able to represent the dynamic behaviour of rubber materials including both rate and amplitude dependence as well as nonlinear elastic behaviour. The overlay method offers a method to obtain such a model using only the already implemented constitutive models in standard FE codes. The result is an FE model corresponding to the one-dimensional generalized rheological viscoplastic model discussed in Section 1.