2. Example (2):
Calculate: , , , for a unidirectional lamina for the
following material combinations: = 0.45 and = 0.55
1. E-glass and polyester (isophthalic)
From table 2.1:
E-glass has the following properties:
= 72.345 GPa
= 0.22
= 3.45 GPa
From table 2.4:
Polyester has the following properties:
= 3.4 GPa
= 0.38
= 75.9 GPa
= . + . = (0.55*72.345) + (0.45*3.4) = 41.32
= = = 7.145 GPa
= . + . = (0.38*0.55) + (0.22*0.45) = 0.308
= = = 6.047 GPa
3. 2. S-glass and epoxy9310:
From table 2.1:
S-glass has the following properties:
= 85 GPa
= 0.22
= 4.8 GPa
From table 2.4:
Epoxy9310 has the following properties:
= 3.12 GPa
= 0.38
= 75.8 GPa
= . + . = (0.55*85) + (0.45*3.12) = 48.154
= = = 6.635 GPa
= . + . = (0.38*0.55) + (0.22*0.45) = 0.308
= = = 8.297 GPa
3. Carbon T300 and vinyl esler:
From table 2.1:
Carbon T300 has the following properties:
= 230 GPa
= 0.2
= 3.53 GPa
From table 2.4:
Vinyl esler has the following properties:
= 3.4 GPa
= 0.38
= 82.7 GPa
4. = . + . = (0.55*230) + (0.45*3.4) = 128.03
= = = 7.421 GPa
= . + . = (0.38*0.55) + (0.2*0.45) = 0.299
= = = 6.202 GPa
Example (3):
Select a matrix, fiber and fiber volume fraction to obtain
material with and
for different fibers and matrices we find that toBy using matlab
get these conditions we use:
D-glass as fiber and Bismaleiraide as a matrix
Matlab code:
clear;clc;close all;
Vm = 0.24;
Vf = 1-Vm;
Ef = 55;
Em = 3.583;
E1 = (Vf*Ef)+(Vm*Em)
E2 = (Em*Ef)/((Vf*Em)+(Vm*Ef))
F = E1/E2
Output:
E1 = 42.6599
E2 = 12.3761
F = 3.4470 =
