Abstract

Amorphous polymers show a time dependent response to an external solicitation. The time dependent response is usually measured in terms of shear response, whereas the bulk response is a more difficult to measure. In the framework of linear viscoelasticity at least two viscoelastic functions are needed in order to evaluate the mechanical behavior of viscoelastic amorphous polymers. Often the one of viscoelastic function is available in terms of creep compliance and the other one is available in terms of relaxation modulus: a reliable procedure for the inter-conversion is needed. Here the inter-conversions between relaxation moduli and creep compliances are described and a numerical method for the inter-conversion is presented. It is showed that the numerical solution lays on the analytical one and it is also less time consuming.

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