Donation Donation
All Springer/NP/PCP Air Gun Discussion General > Engineering- Research & Development
FEA for HPA - it's not out of reach for us
Privateer:
I totally understand. I think that's where people went all crazy on me. I believe to fully understand a problem people need to share data.
It's called Peer Review. I bet you'd LOVE my friends HOME system! That thing is CRAZY beyound belief!
WobblyHand:
--- Quote from: Privateer on May 06, 2023, 02:51:57 PM ---I totally understand. I think that's where people went all crazy on me. I believe to fully understand a problem people need to share data.
It's called Peer Review. I bet you'd LOVE my friends HOME system! That thing is CRAZY beyound belief!
--- End quote ---
I agree. Peer review is indeed a good thing. WAGging the dimensions, is not so good, but all I have.
Sound like a very cool computer setup. Would be neat to see. Of course, I'd want to see what it could do! Always testing the limits!
I'm going to do a 2024 simulation using the identical mesh, at 2.5x rated pressure for giggles. I'm sure I will have to back off the pressure, at least not to have it yield on me. Unfortunately, my SW won't tell me something is about to explode, but it will give me the stresses, and I can compare them to the published material properties. Best I can do.
Privateer:
He's stepping up to an Epyc before long. 128 core 256 thread, with 256 GB of ECC RAM (4TB max)!
WobblyHand:
Looks like the same design in 2024, has a safety factor (no yield, well under ultimate tensile stress) of a smidge under 2:1, best I can tell. This is assuming 2024T4.
I get von Mises stress = 365 MPa. This compares to UTS (ultimate tensile stress) 427, so we are good there, and yield stress of 305 min, 324 MPa typical. The simulation shows the tube grows by 91um. I don't know how much of that is permanent - that's beyond my pay grade. This is a static simulation (linear). Perhaps the answer is different using a non-linear sim.
7075T6 is definitely superior, allowing a 2.5x no yield margin.
Without radiusing the corner, 2024 doesn't seem like a very good choice, at least to my inexpert opinion. The radiused corner doesn't even make 2x yield safety factor. Seems like trouble waiting to happen. But that's only my inexpert opinion, based on swag numbers from crooked pictures...
Privateer:
I have to wonder something.
That area is supported somewhat.
So how likely would that support hold that area from catastrophic failure as seen in the pictures?
That may be why there was no sever injuries.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version