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 $=\; frac\{1\}\{ell\_0\}\; frac\{dell\}\{dt\}\; =\; frac\{v\}\{ell\_0\}$where $ell\_0$ is the original length and $v$ is the speed of deformation. [ [http://scienceworld.wolfram.com/physics/StrainRate.html Strain Rate - from Eric Weisstein's World of Physics ] ]

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.

ee also

* Strain
* Strain gauge
* Stress-strain curve
* Stretch ratio

References