08-21-2014, 04:52 PM
Keep The Change Wrote:I wish we had some deflection data so we could determine any bending stress in the barrel as it whips. Of course the worse bending would likely occur close to the chamber where your barrel is the thickest.
So if you are primarily looking at GP area and such, the bending stresses should be pretty low. But your FoS being to yield, I would have no worries with a 2.
Typically what we do in aircraft structure is take a limit load, in your case it would be your 50 ksi pressures. Then multiply that times 1.5 to make that load 50% higher. Then right a margin of safety against the Ftu of the material if it is a tension load.
So yes the margins of safety might get really low in airplane structure, but then again we have some padding in that number because we increased the load by 50% of the limit load or design load.
So that would make SG4247 a little more comfortable on an airplane.
Spent a million hours on airplanes, restored a couple, witnessed three serious crashes, and still don't really like flying!
I will not ride on fatigue testing machine either, ie helicopter!
(Unless my life depended on it)