In blow-moulding, film production and other processes, polymers are biaxially stretched. For the layout of those processes, for Finite-Element Analysis (FEA) and for raw material development, the mechanical material behaviour of the polymer materials must be known. Therefore, the stress/strain behaviour of the material at forming temperatures and high strain rates is investigated in this paper. A new measurement device is described called the Membrane-Inflation Rheometer. It is capable to measure stress/strain behaviour of polymers under equibiaxial deformation and process relevant conditions concerning temperature and strain rate. The algorithm for data evaluation is explained. Some results for different polymer materials are presented.
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