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Old 01-04-2012
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Quote:
Originally Posted by DelmarRey View Post
The strength of round holes are amazingly strong. As long as the holes have a smooth radius w/polished off edges it should be fine. Cracks start in sharp corners and existing cracks. Fallen Arches: The Surprising Strength of Eggshells


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Cracks can occur even on smooth surfaces:
Fracture mechanics - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/Fatigue_(material)
Among other things (like fatigue) it comes down to how much stress is on the part. Even with smooth radius and polished edges if a part is over stressed or over fatigued, it will fail.

Last edited by casey1999; 01-04-2012 at 07:26 PM.
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