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Modelling of thermo‐viscoelastic material behaviour of polyurethane close to the glass transition temperature

In this contribution a viscoelastic elastomer is examined with respect to its thermo‐mechanical behaviour. Therefore uniaxial tension tests and relaxation tests are performed at different constant temperatures up to the glass transition region. Hence an experimental data pool is provided. On the theoretical side a finite viscoelastic and incompressible material model is used and enhanced by temperature dependency in order to model the experimentally observed effects. The material parameters are strategically identified by means of biologic evolution strategies. Thereby it turned out that the investigated material cannot be modelled as a thermo‐rheologically simple material. Quite the contrary, a new ansatz is chosen.