Mathematical Model of Viscoelastic Behavior of Polyurethane under Compression with Moderately High Strain Rates

The model of viscoelastic polyurethane behavior with brand SKU-PFL-100 under compression up deformation until 25-30% with a deformation rate until 10 с^-1 is presented. Strain-stress curves of polyurethane with different strain rates produced with help of the machine "Instron Electropuls 1000" are used as the experimental data for this modeling. The authors applied the rheological model of Bergstrom -Boyes to define a viscous component of deformation. Stress relationship with an elastic component of deformation is described in two variants: by means of Mooney-Rivlin potential and Arruda-Boyes potential. Obtained values of model parameters are represented. They are found by minimization of deviations function between computation results from experimental data. It is shown that in the considered range of deformations and their rates the model allows to describe a polyurethane behavior with sufficient accuracy for practical purposes. The model is intended for calculation polyurethane elements of shock-absorbers.

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