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Metal finishing Q&As since 1989
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Aluminum finish and fatigue life
I am looking for some information on how much the condition of an aluminum substrate's polished surface, prior to being coated, would be a factor in fatigue life.
Kenny RumpMemphis, Tennessee
1999
Hi, Kenny. I don't think it's possible to take a qualitative term like 'polished' and then get its quantitative impact. But it's a widespread process to shot peen the surface for an improvement in fatigue life -- The theory is that by putting the surface in compression, the cyclic loading on the surface may remain compressive or only slightly tensile.
Regards,
![Ted Mooney, finishing.com](../portraits/ted_mooney_beach.jpg)
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
February 19, 2009
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