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# Questions tagged [rheology]

In the context of liquids and soft matter, rheology aims to relate stresses with rate of change of strain or strain rates in a continuum-mechanics setting.

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### Oldroyd fluid with negative term of memory

I am looking for physical sense for the Stokes equation with memory $$\frac{d}{dt}u+u\cdot \nabla u-\mu \Delta u+\int_0^te^{-(t-s)}\Delta u(x,s)ds=f(u,t)$$ Where for now i am considering $f\equiv 0$. ...
1 vote
52 views

### Sense for a viscoelastic term of Maxwell type

I go reference the book of Jan Prüss (Evolutionary Integral Equations and Applications, 2012) as needed. In this book (pg. 128) it is explored some concepts of stress and strain considering the ...
1 vote
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### How do I quantify an adhesive's ability to stick in contrast to flow?

Let's say you glue a ball to a shovel. How do you quantify this adhesive's and ball's ability to stick to the shovel, moving at different speeds, in air and then while the shovel digs into the ground? ...
116 views

### How can you get the isotropic Young's modulus and Poisson's ratio from rheology data?

I wanted to ask on how to get the Young's modulus and Poisson's ratio for a viscoelastic biomaterial. I have rheological data from the characterization of the biomaterial, the G' and G'' (storage and ...
153 views

### Viscoelastic Kelvin-Voigt model and inelastic strain

In a viscoelastic medium, the total strain can be assumed as the sum of elastic strain and inelastic strain (ref1,2): \begin{align} \label{eq1} (1): \mathcal{E}^t_{ij}= \mathcal{E}^e_{ij}+\mathcal{E}^...
40 views

### Maxwell model subject to reversing constant strain rate

I've been reading about viscoelastic models and using Excel to plot some of their characteristics. I'm particularly interested in their response to a constant strain rate which reverses periodically ...
1 vote
63 views

### Can an electrorheological non-Newtonian fluid be in a definite shape for a short time?

I have seen this Experiment: ELECTRORHEOLOGICAL FLUIDS and balloon Experiment (Stops flow with Static Electricity), and have seen that simple cornstarch is affected by electrostatic forces. The ...