Materials Science and Engineering: An Introduction

Published by Wiley
ISBN 10: 1118324579
ISBN 13: 978-1-11832-457-8

Chapter 16 - Composites - Questions and Problems - Page 677: 16.8b


$E_{cl} = 60. 27 GPa$

Work Step by Step

Given: A continuous and aligned fiber–reinforced composite is to be produced consisting of 45 vol% aramid fibers and 55 vol% polycarbonate matrix; the mechanical characteristics of the two materials are given in the Table. The stress on the polycarbonate matrix when the aramid fibers fail is 35 MPa (5075 psi). Required: longitudinal modulus of elasticity for the composite Solution: Using Equation 16.10a: $E_{cl} = E_{m}V_{m} + E_{f}V_{f} = (2.4 GPa)(0.55) + (131 GPa)(0.45) = 60. 27 GPa$
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