Has anyone seen the following Simulate Message while running analysis on assembly with hyperelastic poperties? Decomp. Singular Stiffness Matrix. Recovering...

October 29, 2013, 7:59 am

≪ Previous: Pin/Ball/Cylinderical Co-ord System don't allow rotation?

Good Day all,

Has anyone run into the following message while running an analysis on an assembly with one component containing hyperelastic properties?

*** Decomp. Singular Stiffness Matrix. Recovering...

Thanks for any ensight you can provide.
Don Anderson

Begin Displacement and Stress Calculation
Tue Oct 29, 2013 08:48:18

Begin Reaction Calculation
Tue Oct 29, 2013 08:48:20

Begin Time Step 9 of 15: 6.00000e-01
Tue Oct 29, 2013 08:48:20
*** Decomp. Singular Stiffness Matrix. Recovering...

Iteration Residual norm
------------- -------------
1 1 Tue Oct 29, 2013 08:48:40

Load Factor: 0.566667
*** Decomp. Singular Stiffness Matrix. Recovering...

Iteration Residual norm
------------- -------------
1 0.0560233 Tue Oct 29, 2013 08:49:04

Load Factor: 0.55
*** Decomp. Singular Stiffness Matrix. Recovering...

Iteration Residual norm
------------- -------------
1 0.0480005 Tue Oct 29, 2013 08:49:27

Load Factor: 0.541667
*** Decomp. Singular Stiffness Matrix. Recovering...

Iteration Residual norm
------------- -------------
1 0.0469847 Tue Oct 29, 2013 08:49:49

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Simulation failed!

October 18, 2013, 2:12 pm

≫ Next: Planetary gear design

≪ Previous: Has anyone seen the following Simulate Message while running analysis on assembly with hyperelastic poperties? Decomp. Singular Stiffness Matrix. Recovering...

I've been trying to run a simulation on a frame and it keeps failing. It says in the log

AutoGEM has detected an element incompatibility across the

highlighted curve. Adding points to the curve may help.

In some cases, re-creating the curve and adjacent

surfaces may be required.

but I can't see anything highlighted.

In the log it also says:

The highlighted geometry may cause meshing problems.

Creo Simulate has placed this geometry in the group "agem_bad_geom".

All problematic geometry is automatically placed in this group.

I don't know where this file is. Any help would be greatly apreciated

Tony Flores

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Planetary gear design

July 2, 2013, 8:41 am

≫ Next: Fatigue Analysis for plastic materials

≪ Previous: Simulation failed!

Hi all

i would like to know how to create a planetry gear reducer.I have modeled all the parts but their mechanism gives problem.

Scenario is that i have a planetry gear head with 5 rows of planetry carriers for a reduction of 1:625.each row has three planetry gear.

Now i have made a sub assembly of Sun gear,planetry gear,and planetry carrier and the gear connection between sun and planetry are correct

BUT the gear connection between the RING gear and the PLANETRY gear is not successful.

NOTE:RING gear is stationary part.

Kindly tell me proper method of correcting these connection.or refer me to some tutorial regarding this issue.

If someone have Planetry gear asembly.kindly email it to davidrifat@yahoo.com so that i can see the mechanism in action and reverse it to correct my own.

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Fatigue Analysis for plastic materials

November 4, 2013, 10:58 pm

≫ Next: Mass properties are not calculated

≪ Previous: Planetary gear design

Dear all,

Is there any option to analyse components made up of plastic materials (e.g pp,30%gf pp, Acetal, Abs) for fatigue failure. Can you please give more details to perform a fatigue analysis for plastic parts using Creo simulate 2.0?

Regards,

Shivaprakash

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Mass properties are not calculated

February 13, 2013, 12:27 pm

≫ Next: Simulation Diagnostic Warning

≪ Previous: Fatigue Analysis for plastic materials

Just starting on Creo 2.0, and when I save a part (or assembly) I get the following conflict window pop up:

"Mass properties are not calculated"

Now.... I know what it means The trouble is I have not created a mass properties feature or a saved analysis and I currently have no need or desire to calculate the mass properties of my part. I have to check this box off every time I save a file.

Does anyone know how to get rid of this?

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Simulation Diagnostic Warning

November 5, 2013, 8:13 pm

≫ Next: Not Constrained Correctly?

≪ Previous: Mass properties are not calculated

"X-axis direction of the local beam coordinate system has changed."

I continue to get this message, and I don't know how to fix this. Any professional help would be welcomed.

Thanks,

Ali

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Not Constrained Correctly?

November 7, 2013, 2:51 pm

≫ Next: The Most Worthless Error Message

≪ Previous: Simulation Diagnostic Warning

Does anyone know how to fix this problem?

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The Most Worthless Error Message

May 2, 2012, 10:19 am

≫ Next: Insufficient Contraints

≪ Previous: Not Constrained Correctly?

This is a gripe not a question. I get this sometimes while trying to mesh complex geometry.

The requested shape change failed because it results in

the deletion of the highlighted geometry. This geometry has

an association that cannot be deleted. "

1) No geometry is highlighted!

2) What does it mean?

I have slowly come to learn that this message indicates that certian idealizations can not share the same point. There is no indication where the problem is located and what can not share a point. This measage predates WF and it still exsists in Creo.

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Insufficient Contraints

November 11, 2013, 6:50 am

≫ Next: Nonlinear Contact analysis of assembly w/ one component containing hyperelastic material properties, can it be done?

≪ Previous: The Most Worthless Error Message

So I'm trying to Run an analysis on an assembly and I am getting the error of (see picture). I have been able to run a few successful analysis but lately they are coming up with this Analysis. Any suggestions?

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Nonlinear Contact analysis of assembly w/ one component containing hyperelastic material properties, can it be done?

October 28, 2013, 10:13 am

≫ Next: MDO help

≪ Previous: Insufficient Contraints

Hi all,

Is it possible to run an contact analysis on an assembly where you have 3 components and the one in the center has Hyperelastic material properties?

The 3 components are not bonded and the middle one is a rubber part not bonded to the outer 2.

Thanks

Don Anderson

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MDO help

November 20, 2013, 10:49 pm

≫ Next: Display Mechanica study status in batch mode

≪ Previous: Nonlinear Contact analysis of assembly w/ one component containing hyperelastic material properties, can it be done?

I need to calculate torque/force acting on the outer friction disc.

The inner friction disc rotates alongwith the shaft and the outer friction disc only rotates when it comes in contact with the inner disc. (Basic principle of clutch)

I'm not sure how to constrain the outer disc in such a way that it rotates due to friction and not as a part of the rest of the assembly.

Also, is it possible to calculate heat generated due to friction??

Please help!!

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Display Mechanica study status in batch mode

November 28, 2013, 3:45 pm

≫ Next: Export deformed state as a Step file or similar, that may be used in a new simulation job.

≪ Previous: MDO help

Hi everybody,

Is it possible to display "run status" (interactive diagnostics) while running analysis in batch mode ?

I mean the content of the .rpt file but I'd like to see it displayed in a prompt command as new lines are added in the .rpt file.

Any help would be appreciated.

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Export deformed state as a Step file or similar, that may be used in a new simulation job.

November 29, 2013, 12:30 am

≫ Next: Batch Mechanica - Available options

≪ Previous: Display Mechanica study status in batch mode

If you want to use the deformed state of a simulation in a subsequent analysis you are advised to export as VRML, go through Shrinkwrap, to end up with a solid model. This is quite time consuming and often tricky to get Shrinkwrap to generate the required details without too many artifacts.

It would be much easier to directly export a Step file of the deformed part. This could then be used in a new simulation if needed.

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Batch Mechanica - Available options

November 29, 2013, 9:52 am

≫ Next: x-sections

≪ Previous: Export deformed state as a Step file or similar, that may be used in a new simulation job.

Hello,

Does anybody know if it is possible to specify option for each analysis.

For example : activating particular Rigid-links or desactivating a Mass or Restriction ?

I can't find documentation about Batch options/scripts for Mechanica.

Many thanks for your help !

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x-sections

December 2, 2013, 5:43 am

≫ Next: FEM analysis of a spring

≪ Previous: Batch Mechanica - Available options

In WF4/5 setting a cross section active in Pro/E meant that it could be seen/used in Mechanica.

This was useful, example defining contact regions on concentric internal components, picking the surfaces was less confusing.

I know we can use 'hide' but in some circumstances it is not as good.

How can we see x-sections in Creo Simulate?

Thanks

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FEM analysis of a spring

December 2, 2013, 2:28 pm

≫ Next: Bonded contact analysis

≪ Previous: x-sections

Hi all,

I've designed a spring and I want to see if the value of tensions are, more or less, the same I've calculated with the formulas.

The matetial is "springflex" with

E=206000 MPa

G=81500 MPa

Su=2270 MPa

d=0.9mm

In my calculation, the spring is verified.

Anyway, the results that Mechanica gives me (I've used WF5 for the FEM simulation) provides tensions much much high...

I've done two tipe of analysis:

1) I've imposed the displacement (35 mm)

2) I've imposed the force (25 N)

but, for me, the results are incorrect but I don't know why.

I've tryed "linear" and "non-linear" analisys for with large deformations.

Greetings

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Bonded contact analysis

August 23, 2013, 3:54 am

≫ Next: Material file database (again)

≪ Previous: FEM analysis of a spring

Hello,

I am trying to do a FEA on bonded contact model, which I ran with contact before.

Even I tried to implement a bonded contact (componenet to componenet) and changed to bonded in model setup, it is not being detected. During the review geometry option it is not even showing that, which is very strange.

Anyone have solution for this?

Regards

Shinoy

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Material file database (again)

December 3, 2013, 4:57 pm

≫ Next: Optimization methods/algorithms

≪ Previous: Bonded contact analysis

Hello all - I'm new to this group but a seasoned Pro/E designer and experienced Mechanica user based on Ireland.

I have a job on which requires me to finally get to grips with the new elastic-plastic analysis functionality of Simulate 2 and apply it to a forming operation on a small 300 series stainless steel tube. Would anybody on here be prepared to share a material definition file for one of these steels, set up with stress/strain data for LDA? I'm not trying to freeload and would be happy to work collaboratively and reciprocally with one or more knowledgeable users who may also also be working to develop confidence in this powerful new functionality.

Many thanks

Tony

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