Quote:
Originally Posted by TerminatorX5
here is the physics 101 from the NASA website... in our case only the example 1 is applicable:....<snip>
|
It is perhaps easier to approach it by agreeing that the bending moment that BMW designed for can be easily compared, without worrying about the absolute value of that bending moment.
600 (or 330) lbs x 8 inches. Relate everything to that. If you have half the weight, at three times the distance, that is 50% beyond the design stress.
And all this is for a static load. The real issue is fatigue, as you inferred.
Anyway, I don't want to rain on anyone's parade. Just pointing out that there are more things to consider than the grade of attachment bolt. I fully agree with your comments on it not being about the receiver itself, but rather the integration of it into the vehicle, and the strength of the surrounding structure.
__________________
2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
Last edited by JCL; 02-05-2013 at 06:04 PM.
|