Understanding Fatigue Failure and S-N Curves

Fatigue failure is a failure mechanism which results from the formation and growth of cracks under repeated cyclic stress loading, leading to fracture. It can result in failure at stress levels well below the material yield or ultimate strengths.

In this video I discuss the mechanisms behind fracture, and how S-N curves can be used to predict the fatigue life of a component.

I also discuss the effect of having a tensile mean stress, and how we can use techniques like the Rainflow counting method and Miner's rule to consider complex cyclic stresses.

The Efficient Engineer is a channel aimed at mechanical and civil engineers. The mission is to simplify engineering concepts, one video at a time!

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[petercalow]

HELLO, I have an exam in 2 and a half hours. Can you tell me why the initial fatigue results are scattered? Cant find the answer anywhere. Great video otherwise!! Thankyou!!

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[aravindvissamsetty]

That was basically my entire Masters level Fracture Mechanics course condensed into just over 8 minutes. Great job!

[bpring]

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[tanmayeheblekar]

Can't wait for the Strain Life video. Outstanding presentation of the concepts as always! Thanks a ton mate

[sultanhassanieh]

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[ShayanAsim]

I am super impressed by your way of summarizing the S-N curve. I was just looking for a video to refresh my concepts and this is perfect. Keep up the good work! Subscribed and expecting even more from you guys now! :D

[andrisberzins]

Great video introducing fatigue! Could mention that damage summation by Miner is only approximation as for variable loading actual loading history can make huge difference. Fun fact initial high loading (even partial yielding) for steels can improve high cycle fatigue.

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