Quote:
Originally Posted by Daniel_LaFleur
That being said, this is a great example of how Lightening holes can often affect structure. Your arm failed because (in addition to the rough play on the field) you removed (lateral) load bearing material. If the material for that particular lightening hole was not removed the arm probably would have had enough lateral structure to survive.
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Also note exactly where it failed - right where the hole on the top & bottom starts. As you get closer to the fixed point (the end held in position) the force on the metal gets higher very quickly given a small force at the free end.
The hole is a "stress concentrator" - the 'lines' of stress (or force) cannot 'flow' through the hole, they must go through a solid, so all the stresses focused at the end of the hole, and that being a weaker point, it failed.
As stated, it can be calculated with some reasonable assumptions. This is called "engineering"
Of course, even with double the arm, there can always be a hit that'll bend it. I, too, hope that your repair efforst go smoothly and you whomp them all in competition...
Don