Let's work with strain matrices. a) Write the 2D simple shear matrix in terms of a shear variable ? b) Write the 2D pure shear matrix in terms of a elongation variable & c) Is pure shear then simple shear the same as simple shear then pure shear? d) Write a matrix for 3D for pure shear with no volume change. Justify that the strain does not change volume. Let's work with strain matrices. a) Write the 2D simple shear matrix in terms of a shear variable ? b) Write the 2D pure shear matrix in terms of a elongation variable & c) Is pure shear then simple shear the same as simple shear then pure shear? d) Write a matrix for 3D for pure shear with no volume change. Justify that the strain does not change volume