I have read that for some alloys fatigue cracks can initiate even if there are no defects in the material, and regardless of how high the stress applied is. I read that they initiate at the surface due to dislocation motions which roughen up the surface forming micronotches, even when the stress is way below the yield strength. How is this possible ? If i were to cyclically stress a defect free aluminium alloy with a smooth surface at like 10 MPa, how can cracks nucleate at the surface when the stress is so low? Why does the cyclical nature cause this odd phenomenon? This has been confusing me for quite some time.
@hazemab-mx6bv
3 жыл бұрын
great lecture thanks a lot in 10:30 neutral logarithm (ln) should be log (base 10) to be Compatible with the adjacent figure??
@TaylorSparks
3 жыл бұрын
Nope. Ln works.
@PradhanaKurniawan
4 жыл бұрын
where did the 1,159 come from? thank you for the video and very helpful
@majedloubani3320
2 жыл бұрын
how did you get da at minute 20? great lecture
@fidansmaili6306
5 жыл бұрын
Great Job! did you explain behavior of the fatigue short crack propagation somewhere in your youtube videos because I cant find it?!
@TaylorSparks
5 жыл бұрын
Unfortunately I have not yet prepared a video on short crack growth.
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