Zobrazeno 1 - 10
of 393
pro vyhledávání: '"Ewoldt, Randy H."'
We report the first-ever complete measurement of MAOStress material functions, which reveal that stress can be more fundamental than strain or strain rate for understanding linearity limits as a function of Deborah number. The material used is a cano
Externí odkaz:
http://arxiv.org/abs/2402.19357
Extensibility is beyond the paradigm of classical soft glassy materials, and more broadly, yield-stress fluids. Recently, model yield-stress fluids with significant extensibility have been designed by adding polymeric phases to classically viscoplast
Externí odkaz:
http://arxiv.org/abs/2308.14223
Autor:
Wang, Yilin, Ewoldt, Randy H.
Thixotropy, anti-thixotropy, and viscoelasticity are three types of time-dependent dynamics that involve fundamentally different underlying physical processes. Yet distinguishing them can be very challenging, which hinders the understanding of struct
Externí odkaz:
http://arxiv.org/abs/2212.07572
Autor:
Wang, Yilin, Ewoldt, Randy H.
We report a detailed experimental study of peculiar thixotropic dynamics of carbon black (CB, Vulcan XC-72) suspensions in mineral oil, specifically the observation of sequential stress increase then decrease at a fixed shear rate in a step-down test
Externí odkaz:
http://arxiv.org/abs/2202.05772
On simultaneous fitting of nonlinear and linear rheology data: Preventing a false sense of certainty
Autor:
Singh, Piyush K., Ewoldt, Randy H.
Uncertainty propagates through calculations, down to molecular scales to infer microstructural features, and up to macroscopic scales with predictive flow simulations. Here we study uncertainty quantification for sequential (two-step) versus simultan
Externí odkaz:
http://arxiv.org/abs/2202.02867
Autor:
Sen, Samya, Ewoldt, Randy H.
There is no universal model for thixotropy, and comparing thixotropic effects between different fluids is a subtle yet challenging problem. We introduce a generalized (model-insensitive) framework for comparing thixotropic properties based on thixotr
Externí odkaz:
http://arxiv.org/abs/2201.10004
Publikováno v:
In Current Opinion in Colloid & Interface Science December 2024 74
Autor:
Gao, Yuan, Paul, Justine E., Chen, Manxin, Seth, Aarav, Liu, Qibang, Hong, Liu, Chamorro, Leonardo P., Ewoldt, Randy H., Sottos, Nancy R., Geubelle, Philippe H.
Publikováno v:
In Mechanics of Materials July 2024 194
Publikováno v:
Journal of Rheology, 66(1), 17 (2022)
We show that Hertzian particle contacts are the underlying cause of the as-yet-unexplained noninteger power laws in weakly nonlinear rheology. In the medium amplitude oscillatory shear (MAOS) region, the cubic scaling of the leading order nonlinear s
Externí odkaz:
http://arxiv.org/abs/2104.05678
Autor:
Chaudhary, Gaurav, Ghosh, Ashesh, Kang, Jin Gu, Braun, Paul V., Ewoldt, Randy H., Schweizer, Kenneth S.
This is an integrated experimental and theoretical study of the dynamics and rheology of self-crosslinked, slightly charged, temperature responsive soft Poly(N-isopropylacrylamide) (pNIPAM) microgels over a wide range of concentration and temperature
Externí odkaz:
http://arxiv.org/abs/2103.02108