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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 Rump
Memphis, 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, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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February 19, 2009

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