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...
But what I would like to know is how close am I from having a crack. There are no symptoms in the material? There material does not change somehow during cycling before cracking?
How to determine in a cast aluminum part its consumed fatigue life?
Lets imagine I get a cast aluminum part that looks good, but I have no idea for how many km it has been used (automotive). Which kind of non destructive tests or methods could I use to determine the consumed fatigue life, and...