An isotropic epoxy resin (E=2GPa, ν=0.3) is reinforced by unidirectional glass fibers (Eglass=70GPa), aligned in the 2 direction, such that the fiber composite is transversely isotropic, with the 1-3 plane being the plane of isotropy. The elastic constants of the fiber composite are:

E1=3.3GPa, ν13=0.25
E2=29.2GPa, ν12=0.3
E3=3.3GPa, G12=1.27GPa
What is the volume fraction of fibers in the composite?

1 answer

0.4