Learned something interesting about loading assumptions.
Why for testing, we will only pull at a certain value, say NDD at 115% then back off vs. holding it for a long period of time.
For aircraft loading and testing:
“you’re not trying to show that you can hold the load and the part doesn’t yield. I think the assumption is if you are flying a plan end you get above limit, you’re going to try and pull out of that pretty quickly, you’re not going to hold it and keep flying unless in danger”
“just trying to show that you can get to yield load and no yielding has occurred between 0-115%”
Boeing commercial assumes you hit Design Limit Load (DLL) once a life)
Military focuses in the 100-115% range, but depends on fatigue spec.