Aluminium, is it safe?

[MaxuS the 2nd]

Hey guys,

I just need an opinion on whether Aluminium would be ok for a Hybrid chamber. The walls of the chamber will be atleast 3mm thick. It's seamless and considering I'm making it myself from a length of 1.25" thick Aluminium Bar, it won't have any stress points.
Will I die a bloody death if I were to use this?
I was planning on using up to an 8x mix.

[Necrosis]

Will I die a bloody death if I were to use this?

I see what you did there.

And yes, if it's a normal 1060 alloy, you most likely will die a bloody death on an 8x mix.

Atleast, if you are using a 3mm thick wall..
I let my program calculate the factor of safety for 1kilo psi, and it was 0.5.. wich means certain death. And I think 8x would produce 1 kilo psi, right?

(I think I've read it somewhere but i can not confirm this)

[MaxuS the 2nd]

It's a 6082 Alloy, but God knows what that means.

I thought I'd incorporate the Necrosis joke into it.
8x should produce around 1kpsi.

[Necrosis]

It's a 6082 Alloy, but God knows what that means.

I thought I'd incorporate the Necrosis joke into it.
8x should produce around 1kpsi.

In the case of 6082 you may or may not die. it has a factor of safety that is 1.

With a wall thickness of 5 mm the Factor of safety is about 2.

Wich still might fail if any ddt occurs.

[MaxuS the 2nd]

Hmm, I think that I will probably give it 6mm walls just to be safe and use it up to 7x or perhaps 6x. it is unlikely that DDT will occur because the chamber is only 5cm long.

[SpudFarm]

i am going to put it like Larda said it to me.

think of a soda bottle. 100 psi no problem then you think of this: do you think your chamber is ten times as strong as a bottle?

[MaxuS the 2nd]

I like it. The answer is yes, yes indeed.

[SpudFarm]

there you go

[Larda]

I downloaded this data-sheet for 6082: Link
I don't know which tempers but if its a bar-stock its normally T4,T5 or T6.
Lets say its T4 because it have the lowest Tensile Strength, 205 MPa.

S = Tensile Strength:205MPa=29700Psi
OD = Pipe OD= 1,25"
T = Wall thickness=0,118"

Burst pressure= (2*S*T)/(OD-2*T)

(2*29700*0,118)/(1,25-2*0,118)
=
6912~6900PSI

So if my calculations are right the burst pressure would be 6900Psi and gives you a safety factor of almost 7.

[MaxuS the 2nd]

Wow, so it would be perfectly safe at a 8x aslong as the other components held.

[D_Hall]

Another nice feature of aluminum....

....When it ruptures it tends to not fragment. You'll see a split, obviously, but the chamber will most likely be in one place. Kinda like ABS just splits.

[DYI]

What formula does your program use, Necrosis? Because that number's a hell of a long way off.

So yeah, the 3mm walled chamber made of T4 6082 should have a reasonably good safety factor up to 10 or 12x.

[MaxuS the 2nd]

Wow, much better than I thought it would be.

[Necrosis]

What formula does your program use, Necrosis? Because that number's a hell of a long way off.

So yeah, the 3mm walled chamber made of T4 6082 should have a reasonably good safety factor up to 10 or 12x.

Cosmosworks. Hmm. I think it uses a different scale... i looked at the stress log and it didnt bulge out or anything.. i think it's the factor when elastic deformation occurs actually. I must edit this setting some day.

[kenbo0422]

You may not believe this but I have about a half ton of T6 6061 aluminum that I got from scrapped machines at work. Most is about 3/4 to 1 1/2 inches thick. My question, is 6061 good for a chamber? Say up to 4x mix, what would the wall thickness be recommended to be?