Quasi Static Non linear Analysis

RAMGANESH
RAMGANESH Altair Community Member
edited October 2020 in Community Q&A

Dear All,

 

I need to perform the Quasi Static Non linear Analysis for the below loading condition.

 

Time (sec)       Load(KN)

0                        0

25                  1333.33

55                  1333.33

 

Time (sec)       Load(KN)

0                        0

25                    4000

55                    4000

 

Load will be applied using actuator at two points, for that what contact to be created??

 

Please let me know the procedure for this analysis and provide your valuable guidelines

 

Thanks

RAM

 

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

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    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"?>NL_Direct_transient.PNG

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    Dear All,

     

    Any tutorial available for  Non linear direct transient analysis.

     

    Thanks

    RAM

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    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"?>contact error.JPG

    <?xml version="1.0" encoding="UTF-8"?>slide contact.JPG

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Hi Ram,

     

    can you share the model file?

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

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    Dear Prakash,

     

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

     

    Thanks

    RAM

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    Dear Prakash,

     

    Did you received my model???

     

    Thanks

    RAM

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2020

    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

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    Dear Prakash,

     

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

     

    please check it and guide me.

     

    Thanks

    RAM

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    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

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    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.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    @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

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    Dear Sir,

     

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

     

     

    Thanks

    RAM

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017
    Altair Forum User said:

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

     

    Can you explain, please?

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    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"?>error.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Ram,

     

    Can you share the updated model?

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    Dear Prakash,

     

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

     

    Thanks

    RAM

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Hi Ram,

     

    I did not receive any file so far.

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

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    Dear Prakash,

     

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

     

    Thanks

    RAM

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    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.

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    Dear Prakash,

     

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

     

    Thanks

    RAM

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    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"?>contactnormals.PNG

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    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

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    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

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Ram,

     

    I will check and will update you soon.

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    Dear Prakash,

     

    Any suggestions?

     

    Please let me know

     

    Thanks

    RAM

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    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.

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    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
      
      

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    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.

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    Dear Prakash,

     

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

     

    Thanks

    RAM

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited January 2017

    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

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