Compute the intralaminar shear stiffness

Question

Response to the following problem:

Compute the transformed reduced stiffness for the material of Problem 1 at θ = 45? and θ = 90? . Comment on the results.

Problem 1: Compute the reduced stiffness [Q] and compliance [S] matrices, and the intralaminar shear stiffness [Q^∗ ] and compliance [S^∗] matrices for a lamina with E₁ = 35 GPa, E₂ = 3.5 GPa, ν₁₂ = 0.3, G₁₂ = 1.75 GP a, G₂₃ = 0.35 GP a.