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Fusion 360 Non-linear simulaton

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Message 1 of 5
snaMQ3JD
211 Views, 4 Replies

Fusion 360 Non-linear simulaton

Hi!

 

How can i view intermediate output in a Fusion 360 Non-linear simulaton if the analysis failes?

 

e.g. Inventor Nastran allows to tick Intermediate Output = on which enables me to view all the increments up to the failure load. Is this not possible in Fusion 360?

 

Also, where can i define a custom number of bisections for each increment?

 

Regards

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4 REPLIES 4
Message 2 of 5
John_Holtz
in reply to: snaMQ3JD

Hi @snaMQ3JD 

 

Here are the answers to your two questions:

  1. It is not possible to view the intermediate results or the partial results of a nonlinear simulation in Fusion. The analysis needs to complete 100% before any results are returned.*
  2. The number of bisections permitted is an input value that is not available to Fusion users.

 

* Except, the one "result" that is available when the analysis fails is the output file. (Of course, the output file is also available when the analysis is successful.) Right-click on Results in the browser and choose "Solver Data". When the dialog appears, change the option from "Solver Data" to "Solver Output". At a minimum, you can find out how many increments it completed and if there were other warnings or errors that may indicate what caused the problem. For example,

  • If the analysis fails to converge on the first step, it is often due to a piece of the model being close to unstable. Confirm that everything is restricted from moving by constraint or contact. If there is a piece that is questionable, add a constraint to see if that helps get to the first step.
  • If the load increment gets to the point where the model may start yielding, check the material properties. I am not sure where Fusion gets the stress-strain curve, but I often see the stress-strain curve is essentially the same slope as the elastic modulus for a considerable range of stress. I suspect this is hard for the solver to converge and always recommend changing the stress-strain curve.

John

 



John Holtz, P.E.

Global Product Support
Autodesk, Inc.


If not provided already, be sure to indicate the version of Inventor Nastran you are using!

"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉
Message 3 of 5
shekar_sub
in reply to: snaMQ3JD

Hi  snaMQ3JD,

 

 ,> How can i view intermediate output in a Fusion 360 Non-linear simulaton if the analysis failes?

If the Non-linear analysis fails there are no results to view.

 

> to view all the increments up to the failure load. Is this not possible in Fusion 360?

If the solve succeeds then one can look at the results at different steps. I have attached an image from the Simulation Samples-> Accuracy Verification Examples -> NonlinearStatic_AVE-01.f3d.

 

NLStressSteps.png

 

>Also, where can i define a custom number of bisections for each increment?

That is not supported. However one can specify the number of steps for the non-linear Simulation under Right Mouse Button on the Study in the browser and Settings.

The other limitations of a Non-Linear static stress study are listed here:https://help.autodesk.com/view/fusion360/ENU/?guid=SIM-NONLIN-STATIC-STRESS are listed here.

 

If you want one of us to take a look at the model please attach it. We will checkout why it is failing.

 

Best regards

shekar

Message 4 of 5
jeremy_camper
in reply to: John_Holtz

Hope it's OK I message you

1. I've done a few static simulations but this is my first nonlinear... what faces should I select in this example picture? I guess I don't understand non linear so far?

 

2. Can you save that animation to a video file?

Message 5 of 5
shekar_sub
in reply to: jeremy_camper

Hijeremy_camper,

 

For your #1, the dataset is available in Home->Samples->Simulation Samples->Accuracy Verification Examples->NonlinearStatic_AVE-01.f3d. You can open this dataset and take a look at how it is setup including which faces are selected. In Simulation workspace you can edit the load Force1 and/or constraint Fixed1. 

For #2 I do not see an option to save the animation in this page to a video file. https://help.autodesk.com/view/fusion360/ENU/?guid=SIM-NLSS-HOW-TO-OVERVIEW

 

Best regards

shekar

EditLoad.png

AccVerification.png

SimSamples.png

Samples.png

    

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