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Z. Kokuti, L. Volker-Pop, M. Brandstatter, J. Kokavecz, P. Ailer, L. Palkovics, G. Szabo, A. Czirjak
Exploring the nonlinear viscoelasticity of a high viscosity silicone oil with LAOS
Appl. Rheol. 26:1 (2016) 14289 (9 pages)
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Measurements and modeling of the nonlinear viscoelastic properties of a high viscosity silicone oil (polydimethylsiloxane, PDMS)
are reported. LAOS test were performed with a high precision rotational rheometer to probe the nonlinear response. The measurements
show that the material can be safely considered linear below strain amplitude 1. The viscous Lissajous-Bodwitch
curves indicate intracycle shear thinning, whereas the elastic Lissajous-Bodwitch curves indicate intracycle strain stiffening in
the nonlinear regime. Secondary loops in some of the measured viscous stress curves are attributed to a non-sinusoidal shear
rate signal. A multi-element White-Metzner model is used as a constitutive equation, which accurately describes the LAOS data
in all measured cases. Based on the extension of the measured data by simulations, nonlinear properties are analyzed both for
the elastic and for the viscous part. It is observed that the nonlinearity considerably increases the weight of the higher harmonics
in the shear stress signal. It is predicted that the viscous nonlinearity has a maximum around 50 rad/s angular frequency, and
that the elastic nonlinearity becomes nearly independent of the angular frequency above 30 rad/s.
► Cite this publication as follows:
Kokuti Z, Volker-Pop L, Brandstatter M, Kokavecz J, Ailer P, Palkovics L, Szabo G, Czirjak A: Exploring the nonlinear viscoelasticity of a high viscosity silicone oil with LAOS, Appl. Rheol. 26 (2016) 14289.
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