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The slip‐link model: A constitutive equation for general biaxial extension of polymer melts
Author(s) -
Wagner M. H.
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920560104
Subject(s) - constitutive equation , slip (aerodynamics) , materials science , ellipsoid , polymer , planar , deformation (meteorology) , tube (container) , link (geometry) , composite material , mechanics , thermodynamics , mathematics , physics , finite element method , computer science , computer graphics (images) , combinatorics , astronomy
Starting from a slip‐link model, we derive a general strain measure for polymer melts. Predictions are compared to experimental data of uniaxial, planar, ellipsoidal, and equibiaxial extensions of a polyisobutylene (PIB) melt. The data do not support Doi's assumption that the tube diameter remains unchanged by deformation. The relative tube diameter and its inverse, the molecular stress function, can be extracted directly from the data. At small strains, the relative cross section of the tube is inversely proportional to the average stretch of the tube.