Plot the variation of Q‾11 as a function of the angle θ between 0 and 90?, using the material properties of given Exercise. When does Q‾11 becomes numerically equal to Q‾22?
Exercise
The following data has been obtained experimentally for a composite based on an unidirectional carbon-epoxy prepreg (MR50 carbon fiber at 63% by volume in LTM25 epoxy). Determine if the restrictions on elastic constants are satisfied.
E1= 156.403 GPa, E2 = 7.786 GPa
v12 = 0.352, v21 = 0.016
G12 = 3.762 GPa