How does metal fatigue work? Is it reversible?

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If I bend a piece of metal forward and back a bunch of times, eventually it will break even if I couldn’t break it in the beginning. I believe that is due to metal fatigue(?) How does that work? What’s specifically getting “tired”? the chemical bonds? the structural integrity?

Say I have a piece of metal that I bent and unbent thousands of times. If I melt it back and recreate the shape, does the fatigue “go away”? How does it work?

In: Engineering

4 Answers

Anonymous 0 Comments

More of structural integrity. Fatigue is basically a slow process of worsening the already present microscopic tears in the metal.

If you melt it down, you reset the structure and will therefore have the fatigue gone.

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