Materials Science and Engineering: An Introduction

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

Chapter 8 - Failure - Questions and Problems - Page 293: 8.16b


$R = -0.50$

Work Step by Step

Given: A fatigue test was conducted in which the mean stress was 70 MPa (10,000 psi), and the stress amplitude was 210 MPa (30,000 psi). $σ_{min} = -140 MPa$ and $σ_{max} = 280 MPa$ Required: stress ratio Solution: Using Equation 8.17: $R = \frac{σ_{min}}{σ_{max}} = \frac{-140 MPa}{280 MPa} = -0.50$
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