Large Amplitude Oscillatory Shear Applications for the Characterization of Dispersed Systems

Merger, Dimitri; Reinheimer, Kathrin; Grosso, Massimiliano; Brader, Joseph M.; Ballauff, Matthias; Kim, J.; Helgeson, Matthew E.; Wilhelm, Manfred

doi:10.1007/978-3-319-15129-8_6

Cited by 2 publications

(1 citation statement)

References 42 publications

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“…When a large shear strain amplitude is applied, the shape of the elastic Lissajous curves shown in Figure 5 is sharply distorted and the area enclosed by that curves is dramatically increased, and these behaviors are more prononunced under the application of the magnetic field. The above analysis demonstrates that MRG-70 exhibits stronger nonlinear behavior under various shear strain and magnetic field, which is dominated by dissipation of the yielded fiber structure (without magnetic field) or magnetor-induced CIPs chain structures (with magnetic field) (Merger, 2015). Another interesting point can be found from Figure 5(b) and (c) is that, at the magnetic field of 96 and194 kA/m, the stress in elastic Lissajous cureves exhibits an overshoot (local maximun) when the larger stain amplitude is applied.…”

Section: Resultsmentioning

confidence: 93%

Characterization of nonlinear viscoelasticity of magnetorheological grease under large oscillatory shear by using Fourier transform-Chebyshev analysis

Wang

Chang

et al. 2020

Journal of Intelligent Material Systems and Structures

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Magnetorheological (MR) grease, which is a type of magneto-sensitive smart material, exhibits complex viscoelastic behavior under different magnetic fields. Storage and loss moduli from oscillatory test are commonly used to characterize such field-dependent viscoelastic behavior. However, they are not able to represent the higher harmonic nonlinearity appeared in oscillatory responses under large amplitude oscillatory (LAOS) shear. In this paper, an investigation is conducted on the characterization of the filed-dependent nonlinearity of MR grease under LAOS by utilizing of Fourier transform (FT)-Chebyshev analysis. To capture the higher harmonic nonlinearity for the modeling and analysis, a comprehensive test program has been conducted. Firstly, MR grease with 70% weight percentage of carbonyl iron particles (MRG-70) is prepared and the stress response of MRG-70 under the oscillatory shear from small to large strain amplitudes with different magnetic field are measured. Then the higher harmonics in stress response signal are used to detect the intercycle nonlinearity of MRG-70 and compare with the traditional analysis method of dynamic modulus. Further, the elastic and viscous measures from FT-Chebyshev analysis are obtained to capture the inter-/intracycle nonlinear behaviors, that is, strain stiffening/softening, shear thickening/thinning, of MRG-70 under LAOS. It is found that, in the presence of magnetic fields, the onset of the intercycle nonlinearities of MRG-70 is originated from shear thickening of MR grease. With the further increase of the shear strain, MRG-70 exhibits the nonlinearities with different combinations of strain stiffening/softening and shear thickening/thinning.

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Section: Resultsmentioning

confidence: 93%

Characterization of nonlinear viscoelasticity of magnetorheological grease under large oscillatory shear by using Fourier transform-Chebyshev analysis

Wang

Chang

et al. 2020

Journal of Intelligent Material Systems and Structures

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Rheological Characterization ofN‐VinylPyrrolidone andN‐VinylCaprolactam‐Based Polymers

Ozkan¹,

McMullen²

2021

Handbook of Pyrrolidone and Caprolactam Based Materials

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This chapter discusses the rheology of linear and crosslinked polymers based on N‐vinylpyrrolidone and N‐vinylcaprolactam in different physical states, such as dilute solution, complex fluid, or molten fluid. A review of the basic concepts of rheology starting with the development of the Boltzman superposition principle is followed by an in‐depth discussion of linear viscoelasticity. The chapter introduces the concepts related to rheological models of viscoelasticity and how these relate to the dynamics of polymer systems. The basic definition of rheology is the science of flow and deformation of matter. Developments in computational rheology have improved the accuracy of both continuum mechanics and molecular dynamics‐based model predictions. Poly(vinyl pyrolidone) has also been evaluated as a rheology modifier and as an additive to generate porosity in electrospun nanofiber technology for tissue regeneration. Rheological characterization was conducted using a parallel plate rheometer at ambient conditions.

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Large Amplitude Oscillatory Shear Applications for the Characterization of Dispersed Systems

Cited by 2 publications

References 42 publications

Characterization of nonlinear viscoelasticity of magnetorheological grease under large oscillatory shear by using Fourier transform-Chebyshev analysis

Characterization of nonlinear viscoelasticity of magnetorheological grease under large oscillatory shear by using Fourier transform-Chebyshev analysis

Rheological Characterization ofN‐VinylPyrrolidone andN‐VinylCaprolactam‐Based Polymers

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