Voigt Approximation

Voigt [5] assumed that the strains are constants throughout the composite. Thus, we can say that

(7.120)

From the first of Equation (7.112), this leads to

(7.121)

Now, Equation (7.117) is written as

(7.122)

Thus, we can write

(7.123)

Using this relation in Equation (7.118) we write

(7.124)