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## Homework Statement

## Homework Equations

Halpin Tsai equation:[/B]

Voigt model:

P*=VfPf+VmPm

Vf= volume of fiber/ volume of composite

Vm= volume of matrix / volume of composite

**ζ= estimated parameter**

Pf, Pm= fiber and matrix properties

V_v=1-Vf-Vm

## The Attempt at a Solution

Since there is no V_v in the Halpin Tsai's equation, I am confused on how the Voigt Model obtained Vm from Halpin Tsai's equation