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How to calculate fatigue life

by rikcardo
Tags: fatigue, life
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rikcardo
#1
Mar8-11, 07:13 AM
P: 5
Hello

How can I calculate the fatigue life of a variable stress between 0 and 90 MPa in cast aluminum?

Do I use the mean stress and compare it with the wohler curve? what is the logic of using the mean stress? Why not the maximum stress?

Do I have to use the Goodman or Gerber diagram?

Any advise on literature or websites about this topic?

Thank you in advance
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edgepflow
#2
Mar8-11, 02:45 PM
P: 688
Try the Soderberg Line. See Equation 50.31, "Mechanical Engineering Reference Manual for the PE," 10th Edition.


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