The SG of fiber-reinforced composites can be represented as shown below. Let the material properties of the fiber and matrix be:
Fiber: E11 =230 GPa, E22 =15 GPa, G12=G13 =15GPa, G23 =7GPa, v12=v13 =0.2000
Matrix: E =4.0GP, ν=0.35
Fiber volume of fraction is assumed to be 60% The material properties are obtained from: “Soden, P. D., Hinton M. J. and Kaddour, A. S., Lamina properties, lay-up configurations and loading conditions for a range of fibre reinforced composite laminates. Compos. Sci. Technol., 1998, 58(7), 1011”