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On the initiation of melt fracture
Author(s) -
McIntire L. V.
Publication year - 1972
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1972.070161115
Subject(s) - weissenberg number , shearing (physics) , viscoelasticity , carreau fluid , materials science , constitutive equation , fracture (geology) , mechanics , mathematics , rheology , composite material , thermodynamics , physics , finite element method
The importance of (τ 11 − τ 22 )/τ 12 (sometimes called the Weissenberg number) in determining the onset of melt fracture is examined using classical linearized hydrodynamic stability analysis. The constitutive relation used is that proposed by Bird and Carreau. It is shown that simple shearing flow of a viscoelastic fluid becomes unstable at a critical value of the Weissenberg number. Implications with regard to polymer processing are discussed.