Question

Consider a UD carbon fiber reinforced epoxy composite (Ef = 240 GPa, Em = 8 GPa) subjected to axial and transverse tensile loads.

1. Plot the variation of E1 and E2 with fiber volume fraction (vf).

Answer #1

A continuous and aligned carbon fiber-reinforced composite
consists of 60% by volume of high-strength carbon
fibers having a tensile strength of 3.9 GPa reinforced in a
polyester resin that, when hardened, displays a tensile
strength of 50 MPa. What is the tensile strength of this composite
in the longitudinal direction?

for a continuous and aligned Kevlar-29 fiber-reinforced
composite, the modulus elasticity in the longitudinal direction is
19 GPa and the modulus of elasticity in the transverse direction is
7.7 GPA. if the volume fraction of fibers is 0.40, what is the
modulus of elasticity for the fiber phase?

For a continuous and oriented fiber-reinforced composite, the
moduli of elasticity in the longitudinal and transverse directions
are 19.7 and 3.66 GPa (2.8×106 and 5.3×105 psi), respectively. If
the volume fraction of fibers is 0.38, determine the moduli of
elasticity of fiber and matrix phases.

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