(3) Consider using vacuum bagging technique to make a carbon/epoxy composite. The thickness of the assembly is 1.2 mm. Assuming that the pressure applied in the autoclave is 547 kPa. Determine: (12’) a). Effective stress absorbed by the fiber network. b). Pressure in the resin. c). Speed of flow of the resin out of the fiber network when viscosity =1 Pa·s. (hint: using Kozeny-Carman to estimate the permeability of fiber reinforcement and then the 1-D Darcy’s law) The fiber volume fractions are: Initial fiber volume fraction Vo = 0.50 Allowable fiber volume fraction: Va = 0.85 Final volume fraction Vf = 0.68. Fiber modulus: E = 234 GPa Fiber aspect ratio: β = 300 Fiber radius rf=3.5×10-6 m Kozeny-Carman constant k0=18