Concept explainers
A fatigue test is made with a mean stress of 17,500 psi (120 MPa) and a stress amplitude of 24,000 psi (165 MPa). Calculate (a) the maximum and minimum stresses, (b) the stress ratio, and (c) the stress range.
(a)
The minimum and maximum stress.
Answer to Problem 30AAP
The maximum stress is
Explanation of Solution
Write the expression to calculate stress amplitude.
Here, the stress amplitude is
Write the expression to calculate mean stress.
Here, the mean stress is
Conclusion:
Substitute
Substitute
Substitute
Substitute
Thus, the maximum stress is
(b)
The stress ratio.
Answer to Problem 30AAP
The stress ratio is
Explanation of Solution
Write the expression to calculate stress ratio.
Here, the stress ratio is
Conclusion:
Substitute
Thus, the stress ratio is
(c)
The stress range.
Answer to Problem 30AAP
The stress range is
Explanation of Solution
Write the expression to calculate stress ratio.
Here, the stress range is
Conclusion:
Substitute
Thus, the stress range is
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