• This Forum is for adults 18 years of age or over. By continuing to use this Forum you are confirming that you are 18 or older. No content shall be viewed by any person under 18 in California.

Looking for some help

Almost any barrel could be stressed past its limit , I don't think any smith in the business could say or would say it's completely safe unless they did the work , even then clients make mistakes loading , leaving patches in barrel , bore laser , etc . Only you can determine if it's safe , work up loads , check pressures using proven data and continue to max safe pressures .
Gun ballet , barrel manuf specify the amounts of individual elements , shilens 416 MAY NOT be the same composition as ER SHAWS or anyone else's .
If you don't feel comfortable start over , it's a small price for piece of mind . I use 41v50 cm vanadium on large cases .
 
Well I don't know anything about shooting, but I know a bit about calculating stresses in materials and can do the math. I would be one of those unemployed internet nerds that were referred to :)
So if you still need a hand with this, let me know.
As alluded to, it is the fatigue strength you need to consider and NOT the yield strength, they are very different. I would also need to know what is your acceptable probability of failure. For example, do you want 1% chance of failure in 10,000 cycles, or 50% chance of failure in 1000 cycles? In case you are wondering, 0% is not an option. I did a real quick search for S-N curves and didn't find anything applicable to martensitic stainless steels, plenty of stuff for austenitic though which isn't surprising. But personally, if I thought there might be as many as 10,000 cycles I would not use anything higher than maybe 40ksi, especially if it is my own face behind the bolt.
As a side note, ASME specifies a 4x factor of safety for material stresses in the B31.1 Power Piping Code, so if the yield strength is 60 ksi then the allowable stress is limited to 15 ksi. Obviously this is not a nuclear power plant, but ASME put a lot of time and effort into keeping things from blowing up. So I generally use their philosophy.
 
wannabe,
I was making fun of myself in reference to internet nerds but sounds like you're one too. I also am a nuclear power engineer. I don't think we have to worry about fatigue in this instance since the endurance limit of stainless steel is very near the yield strength for high cycle fatigue. We're talking low cycle fatigue here so the risk is lower. However, the stresses near the inside surface to approach yield depending on your assumptions. I'd hate for a crack to initiate in the chamber. OTOH, numerical analysis could show that it arrests in the lower stress areas.

I don't know if we have a 4:1 safety factor. I'd like to know. I'm sure big companies have done numerical analysis and their lawyers want to see a healthy safety factor.

--Jerry
 

Upgrades & Donations

This Forum's expenses are primarily paid by member contributions. You can upgrade your Forum membership in seconds. Gold and Silver members get unlimited FREE classifieds for one year. Gold members can upload custom avatars.


Click Upgrade Membership Button ABOVE to get Gold or Silver Status.

You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.


To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.

Forum statistics

Threads
165,557
Messages
2,198,225
Members
78,961
Latest member
Nicklm
Back
Top