8.11  L = 0.3 m

A = 1 mm20 mm = 0.00002 m2

E = 200 GPa

n = 0.27

Fa = 1500 N

R1 = R3 = R2 = R4 =120 W

Vs = 2.5 V

S = 2.10

The axial stress is:

Rearranging Eq. 8.1:

Rearranging Eq. 8.8:

Using Eq. 8.23: