Polymers & Composites
Composites Problem Set 4
Problem 1. An element of a balanced orthotropic lamina is subjected to the following state of
stress as shown in the figure:
x = 100 MPa
y = -50 MPa
xy = 50 MPa
The properties of the lamina are as follows:
E1
Polymers & Composites
Composites Problem Set 3
Problem 1. A [0/90/0/90 s
laminate is made from identical plies having the following
properties:
E1=15 GPa G12=3 GPa
E2=6 GPa v 12 =0.05
Each ply is 0.5mm thick. The laminate is subjected to in-plane loads
N
Polymers & Composites
Composites Problem Set 2
Problem 1. Calculate the
matrix at 30, 45and 60 for the lamina whose Q matrix is given by
Q
20 0.7 0
Q 0.7 2 0
0
0 0.7
GPa
was calculated usingthe off axis stiffnesscoefficients
Q
For matrix at 30 degr
Composite PS 1
October 17, 2015
Problem 1. Calculate the ratios of fiber stress to matrix stress and fiber stress to composite stress for
unidirectional composites with Vf = 10, 25, 50, and 75 percent. Assume that the composites are loaded
in a direction