# Chapter 18 : Composites¶

## Example 18.1 Page No : 610¶

In :

import math

# Variables
E_f = 69;			#modulus of elasticity in GPa
V_f = 40./100;			#Volume of glass fibres %
E_m = 3.4;			#modulus (in GPa)
V_m = 60./100;			#Volume of polyester remath.sin %

# Calculation
E_cl = E_m*V_m+E_f*V_f;			#modulus of elasticity (in Gpa)

# Results
print 'Modulus of elasticity is %.0f Gpa'%(E_cl)

Modulus of elasticity is 30 Gpa


## Example 18.2 Page No : 611¶

In :

import math

# Variables
E_f = 69;			#modulus of elasticity in GPa
V_f = 40./100;			#Volume of glass fibres %
E_m = 3.4;			#modulus (in GPa)
V_m = 60./100;			#Volume of polyester remath.sin %

# Calculation
E_cl = E_m*E_f/(E_m*V_f+E_f*V_m);			#modulus of elasticity when the stress is applied perpendicular to the direction of the fibre alignment(in Gpa)

# Results
print 'modulus of elasticity when the stress is applied perpendicular to the direction of the fibre alignment = %.1f Gpa'%E_cl

modulus of elasticity when the stress is applied perpendicular to the direction of the fibre alignment = 5.5 Gpa