Lennon, Kyle R.; Geri, Michela; McKinley, Gareth H.; Swan, James W. published the artcile< Medium amplitude parallel superposition (MAPS) rheology. Part 2: Experimental protocols and data analysis>, Computed Properties of 123-03-5, the main research area is medium amplitude parallel superposition rheol.
An exptl. protocol is developed to directly measure the new material functions revealed by medium amplitude parallel superposition (MAPS) rheol. This protocol measures the medium amplitude response of a material to a simple shear deformation composed of three sine waves at different frequencies, revealing a rich dataset consisting of up to 19 measurements of the third-order complex modulus at distinct three-frequency coordinates. We discuss how the choice of input frequencies influences the features of the MAPS domain studied by the experiment A polynomial interpolation method for reducing the bias of measured values from spectral leakage and reducing variance due to noise is discussed, including a derivation of the optimal range of amplitudes for the input signal. This leads to the conclusion that conducting the experiment in a stress-controlled fashion possesses a distinct advantage to the strain-controlled mode. The exptl. protocol is demonstrated through measurements of the MAPS response of a model complex fluid: a surfactant solution of wormlike micelles. The resulting dataset is indeed large and feature-rich, while still acquired in a time comparable to similar medium amplitude oscillatory shear (MAOS) experiments We demonstrate that the data represent measurements of an intrinsic material function by studying its internal consistency, compatibility with low-frequency predictions for Coleman-Noll simple fluids, and agreement with data obtained via MAOS amplitude sweeps. Finally, the data are compared to predictions from the corotational Maxwell model to demonstrate the power of MAPS rheol. in determining whether a constitutive model is consistent with a material’s time-dependent response. (c) 2020 American Institute of Physics.
Journal of Rheology (Melville, NY, United States) published new progress about Computer program. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Computed Properties of 123-03-5.