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Bolt holes, burr and fatigue life effects

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SamP

Well-Known Member
Joined
Nov 4, 2016
Messages
94
I've been told that not properly deburring can lead to decreased fatigue life in a bolt hole. I'm trying to go through the mental exercise of how burrs affect the fatigue life on a joint. Haven't found a good explanation yet on the internet. I understand how a crack that is cyclically loaded may grow, but that model doesn't transfer to the burr effects. A burr could be considered an external corner, which I don't believe is a stress concentrator.

Reading the discussion on how to best deburr prompted these thoughts. Some suggest the slight countersinking associated with spinning bits should be avoided since it decreases the bearing area. Rather, a file or chisel should be run over the surface. Since file doesn't go below the surface, it has to leave a sharp corner. At the worst case, there is a slight burr that still exists.

Thanks for your thoughts.
 
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