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Evaluating the exit pressure method for measurements of normal stress difference at high shear rates

Dahang Tang, Flavio H. Marchesini (UGent) , Ludwig Cardon (UGent) and Dagmar D'hooge (UGent)
(2020) JOURNAL OF RHEOLOGY. 64(3). p.739-750
Author
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Abstract
A challenge for polymer rheology is the reliable determination of shear dependent first normal stress difference (N-1 values) at high shear rates (>10 s(-1)). Here, we evaluate the correctness of the commonly applied exit pressure method focusing on polypropylene and high and low density polyethylene melts at 200 degrees C. It is demonstrated that the linear extrapolation of pressure values toward the die exit, which is a key step in the application of the exit pressure method, is affordable to determine N-1 values despite that these extrapolated exit pressure values are characterized by a relative deviation of 25%-40%. The validity of the exit pressure method is further supported by an excellent match with rheological data from the Laun rule (exponent close to 0.7) and a representative simulation of extrudate swelling data in the width and height direction, considering tuned parameters for the Phan-Thien-Tanner constitutive model. Also, the absence of a significant viscous heating effect near the die exit is highlighted based on numerical analysis. (c) 2020 The Society of Rheology.
Keywords
Mechanical Engineering, General Materials Science, Mechanics of Materials, Condensed Matter Physics, FINITE-ELEMENT-METHOD, COX-MERZ RULE, EXTRUDATE SWELL, NUMERICAL-SIMULATION, POLYMER MELTS, RHEOLOGICAL PROPERTIES, FLOW BEHAVIOR, SLIT-DIE, CAPILLARY, POLYPROPYLENE

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MLA
Tang, Dahang, et al. “Evaluating the Exit Pressure Method for Measurements of Normal Stress Difference at High Shear Rates.” JOURNAL OF RHEOLOGY, vol. 64, no. 3, 2020, pp. 739–50, doi:10.1122/1.5145255.
APA
Tang, D., Marchesini, F. H., Cardon, L., & D’hooge, D. (2020). Evaluating the exit pressure method for measurements of normal stress difference at high shear rates. JOURNAL OF RHEOLOGY, 64(3), 739–750. https://doi.org/10.1122/1.5145255
Chicago author-date
Tang, Dahang, Flavio H. Marchesini, Ludwig Cardon, and Dagmar D’hooge. 2020. “Evaluating the Exit Pressure Method for Measurements of Normal Stress Difference at High Shear Rates.” JOURNAL OF RHEOLOGY 64 (3): 739–50. https://doi.org/10.1122/1.5145255.
Chicago author-date (all authors)
Tang, Dahang, Flavio H. Marchesini, Ludwig Cardon, and Dagmar D’hooge. 2020. “Evaluating the Exit Pressure Method for Measurements of Normal Stress Difference at High Shear Rates.” JOURNAL OF RHEOLOGY 64 (3): 739–750. doi:10.1122/1.5145255.
Vancouver
1.
Tang D, Marchesini FH, Cardon L, D’hooge D. Evaluating the exit pressure method for measurements of normal stress difference at high shear rates. JOURNAL OF RHEOLOGY. 2020;64(3):739–50.
IEEE
[1]
D. Tang, F. H. Marchesini, L. Cardon, and D. D’hooge, “Evaluating the exit pressure method for measurements of normal stress difference at high shear rates,” JOURNAL OF RHEOLOGY, vol. 64, no. 3, pp. 739–750, 2020.
@article{8661376,
  abstract     = {{A challenge for polymer rheology is the reliable determination of shear dependent first normal stress difference (N-1 values) at high shear rates (>10 s(-1)). Here, we evaluate the correctness of the commonly applied exit pressure method focusing on polypropylene and high and low density polyethylene melts at 200 degrees C. It is demonstrated that the linear extrapolation of pressure values toward the die exit, which is a key step in the application of the exit pressure method, is affordable to determine N-1 values despite that these extrapolated exit pressure values are characterized by a relative deviation of 25%-40%. The validity of the exit pressure method is further supported by an excellent match with rheological data from the Laun rule (exponent close to 0.7) and a representative simulation of extrudate swelling data in the width and height direction, considering tuned parameters for the Phan-Thien-Tanner constitutive model. Also, the absence of a significant viscous heating effect near the die exit is highlighted based on numerical analysis. (c) 2020 The Society of Rheology.}},
  author       = {{Tang, Dahang and Marchesini, Flavio H. and Cardon, Ludwig and D'hooge, Dagmar}},
  issn         = {{0148-6055}},
  journal      = {{JOURNAL OF RHEOLOGY}},
  keywords     = {{Mechanical Engineering,General Materials Science,Mechanics of Materials,Condensed Matter Physics,FINITE-ELEMENT-METHOD,COX-MERZ RULE,EXTRUDATE SWELL,NUMERICAL-SIMULATION,POLYMER MELTS,RHEOLOGICAL PROPERTIES,FLOW BEHAVIOR,SLIT-DIE,CAPILLARY,POLYPROPYLENE}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{739--750}},
  title        = {{Evaluating the exit pressure method for measurements of normal stress difference at high shear rates}},
  url          = {{http://dx.doi.org/10.1122/1.5145255}},
  volume       = {{64}},
  year         = {{2020}},
}
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