his paper has investigated the relation between simple shear and pure shear in rubber

from which we conclude that: (1) A simple shear was equivalent to a pure shear plus a rotation. The angle θ of rotation is given by tgθ=1/2(λ1-1/λ1) (2) If φ is the angle from the major axis in simple shear in rubber to the x-axis

β0

is the angle from the major axis in pure shear in rubber to the y-axis

then φ=β0

(3) A general expression of the shear strain γ in two-dimensional extension in rubber is given by In simple shear the resulting expression for is.