It is often interesting to examine the response of a viscoelastic material to a small-amplitude oscillatory shear rate. This flow allows you to investigate the linear viscoelastic behavior of the material, and yields the storage and loss moduli, and . For the upper-convected Maxwell model,

(7–18)

For oscillatory shear flow fields, the property curves for the storage and loss moduli ( and ) can be computed. Select Storage Modulus and Loss Modulus in the Load Curves (Part I) menu if you want Ansys Polymat to compute these curves.

To compute each of these curves, you will need to specify a minimum and maximum angular frequency ( and ), and the number of sampling points. See Defining Numerical Parameters and Defining Numerical Parameters for information about specifying numerical parameters for viscometric property curves. See Specifying the Curves to be Calculated for information about specifying which curves you want to compute and plot. (Note that, if you use the automatic fitting method, Ansys Polymat will automatically compute and plot the curves for all properties for which experimental data curves have been defined.)