You are investigating a composite material system from a potential material supplier. The supplier guarantees a fibre modulus of Ef = 237.0 GPa and the resin has a modulus of Em = 3.21 GPa and a poisson's ratio Vm=[?][?]0.31. The manufacturing process chosen will lead to a fibre volume fraction of Vj = 69.0% with no voids. Using simple rule-of-mixtures calculations: E = EjVj+ EmVm E = ( 72/ + 1) - Em a) (1 mark) Calculate the shear modulus for the resin (to one decimal place): GPa Hint: Resin is isotropic b) (1 mark) Estimate the Longitudinal Young's Modulus for the composite lamina (to one decimal place): c) (1 marks) Estimate the Transverse Young's Modulus for the composite lamina (to one decimal place): GPa GPa f) (3 marks) Determine the stiffness matrix for a composite ply oriented 90 to the reference direction. Hint: you can probably do this by inspection! Q90 = Symmetric Symmetric Symmetric