so, all this compression testing i did today had me thinking. while compression testing is certainly interesting, impact loading would be better for describing most paintball breaks.
this got me thinking, exactly how much force is acting on a paintball during a typical break. not an exact answer, just something in the ball park, factor of 10 accurate kinda thing.
simplifying it down to constant acceleration makes it easy, and some other value picking like -
.1 inch break distance, meaning the paintball from start to failure moves a bit under an eigth of an inch, between deformation of the ball, and the movement of the object it strikes.
assume an impact velocity of 250 feet per second.
assume .1 ounces for the weight of the ball.
now, using something like this equation - x = V(t) + (.5)at^2 to find the acceleration, then using F=mA to find the force that would produce such an acceleration. that would the be the force acting on the paintball.
the problem i am having is finding the time to use in that equation. we need time to find acceleration, and i tried using some kind of average velocity assumption to find the time, but thats just not cutting it.
any high speed we can use? or possibly someone has a good idea for a formula to figure out an average velocity?
if i knew a formula, it would not be hard to write an excell macro to calculate if you are going to get a break or not. or the probability you are going to get a break.
Edited by cockerpunk, 14 January 2009 - 12:35 AM.