Hi Ram,

You can run a Non linear direct transient analysis. You can use slide contact.

For more information about NL direct transient analysis, refer to NL direct transient analysis section in OptiStruct user's guide.

<?xml version="1.0" encoding="UTF-8"?>

Dear All,

Any tutorial available for  Non linear direct transient analysis.

Thanks

RAM

Dear Prakash,

As suggested by you did direct transient Analysis,but getting the following error.

Generated slide contact with the attached parameters

Please  give your valuable suggestions

Thanks

RAM

<?xml version="1.0" encoding="UTF-8"?>

<?xml version="1.0" encoding="UTF-8"?>

Hi Ram,

can you share the model file?

Use this link to share the file: https://ftam1.altair.com/filedrop/~Ce4god

Dear Prakash,

Shared the model,please check it and guide me how to solve this problem.

Thanks

RAM

Dear Prakash,

Did you received my model???

Thanks

RAM

Hi Ram,

Check this example model.

You are using Transient analysis type which ignore all non linearities.

Unable to find an attachment - read this blog

Dear Prakash,

I had shared the updated model similar to the model which you send .

please check it and guide me.

Thanks

RAM

Dear All,

While solving the problem following error occurs

A fatal error has occurred during computations:

  *** ERROR # 4751 ***
  RBE1, RBE3 and mpcs are not supported in large displacement analysis.

 *** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED.

Please provide your valuable suggestions

Thanks

RAM

Hi Ram,

Which version of HyperWorks are you using?

The error you see was a bug and was fixed. Try in HyperWorks 14.0 and let us know if you face any issues.

@RAMGANESH

FYi,

You can check this tutorial on Non linear implicit analysis where load is imposed.

OS-1500: Nonlinear Implicit Analysis of Bending of a Plate

Dear Sir,

I had tried with the above tutorial ,but getting struck with the contact definition

Thanks

RAM

I had tried with the above tutorial ,but getting struck with the contact definition

 

Can you explain, please?

Dear Prakash,

While generating slide contact between the seat model and actuator for applying the load ?

The actuator profile is not getting impact with the seat model.

Thanks

RAM

<?xml version="1.0" encoding="UTF-8"?>

Ram,

Can you share the updated model?

Dear Prakash,

Model shared to your Dropbox .Please check it and guide me.

Thanks

RAM

Hi Ram,

I did not receive any file so far.

Dear Prakash,

Model shared to your Dropbox .Please check it and guide me.

Thanks

RAM

Hi Ram,

Contact surface normals are not defined properly. Contact surface normals of master and slave should face each other. This is not respected in your model.

Please check and try again.

Dear Prakash,

Contact surface normals means the element normal or some other thing ,please explain??

Thanks

RAM

Ram,

Not the element normals. I am checking if there are any other issues in the model. Will update soon if there are any.

<?xml version="1.0" encoding="UTF-8"?>

Dear Prakash,

I need to perform this analysis for 55 seconds with below two loadings.

Time (sec)       Load(KN)

0                        0

25                  1333.33

55                  1333.33

Time (sec)       Load(KN)

0                        0

25                    4000

55                    4000

Thanks

RAM

Dear Prakash,

I have did the corrections in the contact surface normals as suggested by you and ran the analysis again.

Same problem exists.. Please guide me

Thanks

RAM

Ram,

I will check and will update you soon.

Dear Prakash,

Any suggestions?

Please let me know

Thanks

RAM

Hi Ram,

Can you change the contact type to slide instead of using contact property?

Also, create an RBE2/RBE3 and apply load through this instead of applying on nodes.

Dear Prakash,

I applied the force directly to the model using RBE3 element and removes the actuator profile ,Contact definition .

Then run the analysis,the following error occurs

*** ERROR # 4079 ***
 Non-convergent nonlinear iterations for subcase 2.

 *** ERROR # 4002 ***
 Running RADIOSS engine, 1 ERROR and 0 WARNINGs have been detected.
 They are listed below.

 ENGINE ERROR:
  ** ERROR : RADIOSS IMPLICIT STOPPED DUE TO TIMESTEP LIMIT **
       ISTOP=-2
  
  NLGEOM subcase        2, engine finished
  
(Running in-core solution)

 Volume                              = 1.21405E+006   Mass     = 9.56892E-003

 *** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED.

                        ***** END OF REPORT *****

 For Useful OptiStruct Tips and Tricks, go to the URL:
http://www.altairhyperworks.com/tips.aspx
 PROGRAM STOPPED DUE TO ERROR.

************************************************************************
  
 A fatal error has occurred during computations:
  
  *** ERROR # 4079 ***
  Non-convergent nonlinear iterations for subcase 2.
  
  ANALYSIS COMPLETED.
  
  *** SOME ERRORS WERE REPORTED DURING THE RUN,
  *** PLEASE VERIFY RESULTS AS THEY MAY BE INVALID.
  

 *** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED.

Thanks

RAM
  
  

Hi Ram,

I ran a normal modes analysis to check the integrity of the model. I think there are few modelling errors.

Couple of nodes from actuators have a strange behavior. Maybe try to remesh the actuator parts and re-run again.

Dear Prakash,

I had tried with changes you said,same error occurs.

Thanks

RAM

Dear Prakash,

When i am solving the problem with direct transient analysis without any contact definition by applying load directly to model,the problem is solved without any error.

But while solving with contact definition in NLgeom analysis error occurs. Please guide me to solve this issue.

Thanks

RAM