Journal
RHEOLOGICA ACTA
Volume 50, Issue 9-10, Pages 741-752Publisher
SPRINGER
DOI: 10.1007/s00397-011-0553-2
Keywords
Oscillatory flow; Normal stresses; Second normal stress difference; Corotating frame
Categories
Funding
- Rheology Research Center
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Using the integral form of a nonlinear corotational model, we derive explicit analytical expressions for the zeroth, second, and fourth harmonics of the second normal stress difference in large-amplitude oscillatory shear (LAOS). This model yields an arbitrary normal stress ratio (ANSR) in any simple shearing deformation, including LAOS. This corotational ANSR model adds one parameter to the corotational Maxwell model, a time constant lambda (0) controlling the ratio I(2)/I(1) for both the real and imaginary parts of each harmonic of the normal stress difference. The explicit analytical expressions for all harmonics of the alternating shear stress and first normal stress difference responses in LAOS match those obtained previously for the corotational Maxwell model. We evaluate the corotational ANSR model for the case of a single Maxwell relaxation time fluid.
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