Recoverable Shear Strain and the Barus Effect in Polymer Extrusion

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  • E. B. Bagley
    Chemical Engineering and Civil and Environmental Engineering Departments, Washington University, St. Louis, Missouri 63130
  • H. J. Duffey
    Chemical Engineering and Civil and Environmental Engineering Departments, Washington University, St. Louis, Missouri 63130

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<jats:p>Following essentially the analysis of Nakajima and Shida but using a one-constant stored energy function a simplified relationship is given between recoverable shear strain imposed on a flowing melt during capillary flow and the magnitude of the extrudate swelling on emerging from the capillary. Where experiments on capillaries of several different (L/R) values cannot be carried out there are some advantages to studies using a zero-length (orifice) die rather than a long capillary.</jats:p>

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