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A Note on the Elasticity of Polymer Melts Described by Primary Normal Stress Difference (N 1 )
Author(s) -
GarcíaFranco César A.
Publication year - 2013
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201200048
Subject(s) - viscoelasticity , thermodynamics , mathematics , elasticity (physics) , materials science , polymer , constitutive equation , shear rate , mathematical analysis , viscosity , composite material , physics , finite element method
A method is proposed to characterize the elastic behavior of polyolefin melts, by calculating the first normal stress difference, N 1 as a function of shear rate. The method is predicated on Cogswell's abrupt contraction flow analysis.1 These results are compared with experimental measurements and calculated values with a variety of methods, such as: i) Laun's rule2 for obtaining viscometric functions from linear viscoelastic data, ii) methods proposed by A. Khalik, et. al.3,4 and Wagner,5 for calculating N 1 from viscosity data, and iii) N 1 values calculated with the Johnson & Segalman constitutive equation.6 These comparisons yield acceptable agreement.