Question

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?

Vf:

Answer 1

0.4

Answer 2

e=[0.00485 -0.00159 0.00106 0 0 0.00394]