David M. Hoyle
Transient overshoot extensional rheology of long-chain branched polyethylenes: Experimental and numerical comparisons between filament stretching and cross-slot flow
Hoyle, David M.; Huang, Q.; Auhl, D.; Hassell, D.; Rasmussen, H.K.; Skov, A.L.; Harlen, O.G.; Hassager, O.; McLeish, T.C.B.
Authors
Q. Huang
D. Auhl
D. Hassell
H.K. Rasmussen
A.L. Skov
O.G. Harlen
O. Hassager
T.C.B. McLeish
Abstract
This work analyses the high-strain extensional behavior of long-chain branched polyethylenes, employing two novel extensional rheometer devices, the filament stretching rheometer and the cross-slot extensional rheometer. The filament stretching rheometer uses an active feedback loop to control the imposed strain rate on a filament, allowing Hencky strains of around 7 to be reached. The cross-slot extensional rheometer uses optical birefringence patterns to determine the steady-state extensional viscosity from planar stagnation point flow. The two methods probe different strain-rate regimes and in this paper we demonstrate the agreement when the operating regimes overlap and explore the steady-state extensional viscosity in the full strain-rate regime that these two complimentary techniques offer. For long-chain branched materials, the cross-slot birefringence images show a double cusp pattern around the outflow centre line (named W-cusps). Using constitutive modeling of the observed transient overshoot in extension seen in the filament stretching rheometer and using finite element simulations we show that the overshoot explains the W-cusps seen in the cross-slot extensional rheometer, further confirming the agreement between the two experimental techniques.
Citation
Hoyle, D. M., Huang, Q., Auhl, D., Hassell, D., Rasmussen, H., Skov, A., …McLeish, T. (2013). Transient overshoot extensional rheology of long-chain branched polyethylenes: Experimental and numerical comparisons between filament stretching and cross-slot flow. Journal of Rheology, 57(1), 293-313. https://doi.org/10.1122/1.4767982
Journal Article Type | Article |
---|---|
Publication Date | Jan 1, 2013 |
Deposit Date | Jan 21, 2013 |
Publicly Available Date | Mar 28, 2024 |
Journal | Journal of Rheology |
Print ISSN | 0148-6055 |
Electronic ISSN | 1520-8516 |
Publisher | American Institute of Physics |
Peer Reviewed | Peer Reviewed |
Volume | 57 |
Issue | 1 |
Pages | 293-313 |
DOI | https://doi.org/10.1122/1.4767982 |
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Copyright Statement
© 2013 The Society of Rheology. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of rheology, 57(1): 293-313 and may be found at https://doi.org/10.1122/1.4767982
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