Strain_Rate

Strain Rate

Strain rate, with regards to materials science, is the change in strain over the change in time and is denoted as έ.

έ = δε/δt

We have

έ = δε/δt $= \frac{1}{\ell_0} \frac{d\ell}{dt} = \frac{v}{\ell_0}$

where $\ell_0$ is the original length and $v$ is the speed of deformation.¹

In a Newtonian fluid, the relation between the shear stress and the rate of strain is linear, the constant of proportionality being the coefficient of viscosity.

References

^ Strain Rate - from Eric Weisstein's World of Physics

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References