Repeat Problem 7.18 for a Kevlar \(^{\circledR} /\) epoxy composite having lamina properties as follows:

Problem 7.18

An antisymmetric angle-ply \([+\theta /-\theta]\) laminate is to be made of carbon/ epoxy and designed to have a laminate CTE, \(\alpha_{x}\) as close to zero as possible. Determine the ply orientation \(\theta\) needed to meet this requirement. The lamina properties are as follows:

This Problem requires extensive calculations, and the use of a computer is recommended.

Transcribed Image Text:

E = 76 GPa, E = 5.5 GPa G12 = 2.3 GPa V12 = 0.34 lamina thickness = 0.125 mm = -4.0 106 m/m/K = 79.0 10-6 m/m/K