ISSN:
1435-1528
Keywords:
Strain measure
;
damping function
;
extensional flow
;
transversely isotropic flow
;
planar flow
;
shear flow
;
Doi-Edwards model
;
molecular stress function
;
classification of extensional flows
;
planarity index
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Abstract From stress-strain experiments in extensional and shearing flows, nonlinear strain measures and effective damping functions are derived for a polyisobutylene melt. The strain measures determined in planar extensional flow and in simple shear flow coincide. Experimental results are compared with predictions of two molecular theories, the Doi-Edwards model and the molecular stress function approach of Wagner and Schaeffer. Discrepancies between theories and experiment lead to a reconsideration of the classification of extensional flows. The symmetry of the flow field is identified and quantified as an important parameter influencing the strain measure, and a unifying strain measure for general extensional and shearing flows of polymer melts is presented.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00366335
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