Spiral bevel gear analysis 1

[ntoukis21]

Hello,

I am trying to do an analysis on a pair of spiral bevel gears on Creo Simulate 2.
I want to check 1)Root bending stress and 2)Surface contact stress.
The gear is rigid,and the pinion is free to move on Theta.
The problem is that it takes too long to finish an analysis and the results are not what I am expecting.
It's hard to get a convergence under 10%, and as I refine the mesh,days were added to calculation time.

The system I am running Simulate is a 12core @ 3.5Ghz CPU and 32GB Ram. I set Simulate to use 16GB of the Ram.

I am asking if anyone has get involved with Gear analysis on Creo Simulate to give me some advice or tips if there any.

Thanks in advance.

 

[shaun8567]

"The gear is rigid,and the pinion is free to move on Theta."

What is applying the torque load? Can you put your model?

 

[brep]

Sounds like the constraints are not modeled correctly... It might be worth attaching a screenshot or sketch of what you are trying to do.

Also, assigning 16Gb of solver RAM sounds way too high. Unless the model is enormous (millions of equations/DOF) then you won't need that much. There are notes on what memory is required for a given analysis in the log file, but just try reducing it for starters. A machine with that your spec is capable of solving huge simulations, so a simple gear tooth should not make it even blink.

 

[geesamand]

Is there any correlation between gear contact stresses and Von Mises stress?

It is my understanding they are not the same. Gear contact stresses and limits are empirical quantities.

My advise is to use gear analysis software and skip FEA.

David

 

[ntoukis21]

The number of equations is about 2M. I have great results and quite fast when I run spur gear simulations. And I have compare the results with gear analysis software (Kissoft) and they are fine. But when I have to run Spiral bevel gear simulation the mesh elements and so equations and calculation time goes way too high. To have convergence on the contact surface I have to make a very fine volume mesh (max element size ~0.5).
Thanks for your help!