Difference in simple shear and rotational strain

[rahuldg11]

Is simple shear same as rotational strain? or, is it a type of rotational strain?

 

[mugaliens]

More on http://en.wikipedia.org/wiki/Shear_stress" .

More on http://en.wikipedia.org/wiki/Strain_(materials_science)#Strain".

Put simply, shear is a stress applied parallel or tangential to the surface of a material, while normal stress is applied perpendicularly. The units are force/area.

Strain, on the other hand, is the measure of deformation in the material, and those units are in length/length (it's a dimensionless quantity).

Thus, for any given amount of sheer, the harder the material, the less the strain.