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How to calculate fatigue life

  1. Mar 8, 2011 #1

    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
  2. jcsd
  3. Mar 8, 2011 #2
    Try the Soderberg Line. See Equation 50.31, "Mechanical Engineering Reference Manual for the PE," 10th Edition.
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