On the Use of a Kolsky Torsion Bar to Study the Transient Large-Strain Response of Polymer Melts at High Shear Rates

[+] Author and Article Information
Y. Hu, R. Feng

Department of Engineering Mechanics, University of Nebraska-Lincoln, Lincoln, NE 68588-0526

J. Appl. Mech 71(4), 441-449 (Sep 07, 2004) (9 pages) doi:10.1115/1.1756142 History: Received September 06, 2001; Revised November 20, 2003; Online September 07, 2004
Copyright © 2004 by ASME
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Grahic Jump Location
Schematic of KTB rheometric experiment. (a) Experimental setup based on a Kolsky torsion bar system. (b) Torsional wave propagation during the experiment.
Grahic Jump Location
Schematic of the rheometer assembly. (a) Thermal chamber and asymmetrically paired bars. (b) Cone-and-plate rheometric cell.
Grahic Jump Location
Shear rate and shear stress profiles from a typical KTB rheometric experiment on the DuPont-20 LDPE melt at 190°C. The thicker line with respect to the left axis is the rate profile. The thinner line with respect to the right axis is the stress profile.
Grahic Jump Location
Comparison of shear stress measurements with and without thin Teflon film. The initial temperatures for both experiments were 190°C. The solid line is the measurement with Teflon film and under a plateau shear rate of 3900 s−1 . The broken line is the measurement without Teflon film and under a plateau shear rate of 3970 s−1 .
Grahic Jump Location
Shear stress profiles for various shear rates and 190°C initial temperature
Grahic Jump Location
Shear stress-shear strain relations for various shear rates and 190°C initial temperature. The circles indicate the maximum shear strains reached in the experiments.
Grahic Jump Location
Variation of transient response with initial temperature. The mean plateau shear rate is 3990 s−1 and the deviation is ±90 s−1 .
Grahic Jump Location
Viscous stress jumps for various shear rates and 190°C initial temperature
Grahic Jump Location
Comparison of the ratios of shear stress to shear rate with the apparent shear viscosity results on similar LDPE melts. The squares are the steady-state data and estimates for the DuPont-20 LDPE melt at 190°C. The triangles are the results corrected for the shear strain hardening. The circles and the broken line are respectively the capillary results of the apparent shear viscosity of a PEMEX LDPE melt, 6, and that of a Union Carbide LEDP melt, 14, both at 190°C.




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