1. Problem 4.5
= 230 *10^9 =4.6 *10^9
= 92*10^9 = 1.769*10^9
=0.25 =0.3
= 0.4
Solution
= 9.476 *10^10
= 7.566 *10^9
= 0.28
= 2.911*10^9
Problem 4.6
= 0.55 so
a) E-glass - Polyster
= 72.345 Gpa = 3.4 Gpa
= 3.45 Gpa = 75.9 Mpa
So
= 4.31*10^10 7.145*10^9
= 01.6425*10^8 0.292
b) S-glass – epoxy (9310)
= 85 Gpa = 3.12 Gpa
= 4.8 Gpa = 75.8 Mpa

2. So
= 4.8154*10^10 6.6356*10^9
= 1.6525*10^8 0.292
c) Carbon(T300) – Vinyl ester
= 230 Gpa = 3.4 Gpa
= 3.53 Gpa = 82.7 Mpa
So
= 1.2803*10^11 7.421*10^9
= 1.7866*10^9 0.292
Problem 4.11
This could be:
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