Simulation studies in Fusion 360

[Jasper Frost]

Hello,

I have a question for any Fusion 360/Autocad engineering gurus out there.

I'm learning to use Fusion 360 and I'm chugging my way up the curve... One of the features of Fusion is the ability to take an object and perform simulations of stress on it to see how it could hold up under pressure or impact. T

To make it easier to learn the simulation module I'm using a cad drawing of a 10/22 bolt. First I test the stock bolt (material: steel) and get the expected deformation (if any). Then I've been removing stock from the bolt to lighten it to see if any of the modifications will deform the structure or cause it to fail. Here's a question I have and I'm not sure if I'm even asking the correct questions...

In the simulation, the force against the face of a part can be set from 0 to 'X' in nM (newton-meters). What I'm trying to determine is how much pressure a round of .22 with 45000 C.U.P. would be if converted to nM? (or psi to nM). Is there another way of modeling the expected pressures taking place in this situation to accurately portray what's happening within a receiver?

I've just started fooling around with the model today and I've run one simulation at 1nM and one at 10 nM. Obviously different deformation. Is the amount of pressure being exerted upon the bolt after it detonates the primer of a round in the chamber even measured in nM?

Any advice or thoughts would be greatly appreciated it!

Thanks.

[Paseclipse]

Maybe this will help for converting to nM?- https://www.unitconverters.net/press...uare-meter.htm

[Jasper Frost]

Thanks. That's a better converter than the one I tried earlier before posting the question. And here in lies part of the problem. The peak pressure that takes place in the chamber and barrel are/were measured in CUP. Now the measurements are being taken with a piezo-electric probe that reads the pressure in psi. I tried one converter earlier and didn't think the numbers were correct. I then tried the converter you posted and got this figure 45000 psi = 310264078.19 nM. So I tried that as a figure in a simulation. Completely obliterated the object / bolt. hehehehe.

Then I looked into converting CUP to PSI and apparently - you can't, or it doesn't convert per se.

At least I know that I'm not figuring out how to simulate the pressure correctly. Back to square one !

In fact, I don't even know if applying cup figures even is applicable. But I'm learning...

[kcstott]

Here's a document I found a while back and it seems to be the only "conversion" for CUP to PSI. It is pretty darn accurate too.

[Jasper Frost]

Thank You.

That's the clearest explanation I've read.

[kcstott]

Thank You.

That's the clearest explanation I've read.

[Half Cocked]

Newtons is a unit of force.
Newton-meters is a unit of torque.
Newtons/m^2 (pascal) is a unit of pressure like lbs/in^2 (psi).

[tr6guns]

torque, I wake up with it every morning, with pee hard on I push it down to go to the bathroom and my feet slip out from under me ( that's torque )

[Half Cocked]

torque, I wake up with it every morning, with pee hard on I push it down to go to the bathroom and my feet slip out from under me ( that's torque )

It doesn't work that way. The downward force on your willy is reacted by an equal and opposite force on your hand.

Now, if you have your wife or girlfriend crank down on your hardware ...

[Jasper Frost]

Newtons is a unit of force.
Newton-meters is a unit of torque.
Newtons/m^2 (pascal) is a unit of pressure like lbs/in^2 (psi).

That's where I was throwing myself off. I wasn't looking at force and pressure in the correct way. Though, the analogy on the morning wood makes it much clearer now.

[ar15barrels]

Any advice or thoughts would be greatly appreciated it!

Thanks.

You are working with dynamic forces not static forces.
I'm not familiar with the software you are using.
Is your simulation accounting for the mass of the part and then moving the part against thhe spring after the force is instantaneously applied, or is it statically compressing a part and looking at deflection?
Did you define the stroke of the part and the details of the spring preload and rate as part of your calcs?
If the travel and the spring forces are not part of the calcs, you are not properly simulating what's happening in real life because your bolt has freedom of movement within the receiver that is only limited by the reciever (stroke), the spring (preload and rate) and inertia (mass of the bolt).