Edgun Leshiy 2 design safety concerns part 4 Material and simulation

Analyzed the Leahiy 2 tube material with Hitachi Vulcan material analyzer.
Material is what manufacturer says it is, russian D16T Duralumin or by other name 2024
Simulated the tube with correct material specs and came to the conclusion that material should hold but design is not as good as should be.

[@scott-cy5xd]

Thanks so much for all your effort, a big bummer for those invested in that gun, people sure do love them…

[@dangerous8333]

Nothing is settled yet, so not a bummer yet. Not a bummer anyway, because it can be fixed.

[@louigi6001]

Very interesting, and people pay a lot of money for something that may explode between your shoulder and cheek ? I think I'm not going to buy one any time soon.

[@craigburton-vh2gd]

26- 08 - 23 Hello I have a leshiy 2 which is slowly leaking air from the air tube and plenum seal and have tried resealing it with new orings but it will not seal and loses the air pressure over a number of hours could the metal have stretched at the seal point.

[@MJPilote]

More likely is a scratch at the seal point on one of the parts. Even a hair between the seal can cause a leak.

[@Gippetos]

Nice work Marko. If it's not much trouble, would you mind doing one more simulation with the threads pressurized?

[@MJPilote]

Did that pretty early on, thread is the first point of failure if it gets pressurized. But it's very unlikely that could happen.

[@Gippetos]

@@MJPilote Under normal circumstances, I would agree, but I don't believe we have the whole story. JMO...if the square corner was the origin of the failure, the failure would have been limited to a radial separation of the end. It's the origin of the failure that interests me. If the failure originated at the threads, I would expect to see a lengthwise split. With less ductile material, I can envision the radial separation of the end as a byproduct of the initial failure. Doesn't really matter at this point I suppose. :)

[@MJPilote]

@@Gippetos Have seen couple of pressure failures and they always split along the thread not lengthwise. It usually makes a helicoil of the thread for couple of turns and thats it. Corner looks like its been split and bent after, like it cracked lengthwise and then split around the bottom like it was hit But you are right it really doesn't matter. The main thing is it should not rupture unless the user did something really stupid.

[@Gippetos]

@@MJPilote Good point on it following the thread...an oversight on my part. Think I'll continue using CrMo tubing just the same. :)

[@MasonStormSunny]

What if the bottom is conical, not flat?

[@MJPilote]

I see no problem in that, the conical bottom relief the stress from the corner.