Cold Work vs. Shot-Peening 1

[Neubaten]

Imagine an aluminium flat coupon (2" thick) having a central hole under traction/compression alternate tension.

What process would you apply for increasing fatigue life:

Cold working the internal diameter by interference or shot-peening the hole?

Supose both process are optimized to their maximum potential.

 

[jetmaker]

There are many reasons to pick one over the other. Most are based upon what is most suitable to do from a practical standpoint. I am not sure how the depth of the compressive layers differ for each method.

However, data (proprietary) which I have seen indicates that a cold-worked hole is superior to shot-peened holes. This is most likely due to the fact that cold-working is a uniform process than with shot-peening.

jetmaker