Stretching and spin
The spatial velocity gradient splits as L = D + W. The symmetric part D stretches a material cross. The skew part W only spins it. Simple shear contains both.
L = Ḟ F⁻¹ = D + W
The spatial velocity gradient splits as L = D + W. The symmetric part D stretches a material cross. The skew part W only spins it. Simple shear contains both.
L = Ḟ F⁻¹ = D + W