Contact problem in NLGEOM

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

Hi @Prakash Pagadala

I am running an NLGEOM analysis with  rigid impactor. I am not able to get contact  behaviour properly, the contact id getting detected after certain intersection with the part.

I have sent the file through secure link. Kindly let me know about it.

 

I have run the same in radioss but would like to compare the explicit and implicit results.

Thank you.

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi Gopal,

     

    I will check and update to you, thanks 

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited August 2017

    Hi  @Prakash Pagadala

    Any update on the above points

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi Gopal,

     

    Did you convert the explicit deck from RADIOSS to OptiStruct?

     

    Looks like some contact elements are lost during conversion. I am setting up again. Will update soon. 

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited August 2017

    Hi Prakash,

    I have made the deck in optistruct and there is no conversion involved from Radioss to optistruct

     

    Thank you.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi Gopal,

     

    Recreated the contact and this is the result, Do you have the same result?

    <?xml version="1.0" encoding="UTF-8"?>Anim1.gif

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Considering the thickness, there is a gap of 2.35 at contact. 

    <?xml version="1.0" encoding="UTF-8"?>Anim2.gif

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited August 2017

    Hi,

    Kindly send the updated file. let me know about the changes done.

    Also I want the contact with very less initial gap as this is a quasistatic run but the displacement observed is 50 mm and thus running it in NLEGOM subcase and when the impactor is rigid it creates problem in the same. 

     

    Thank you

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Gopal,

     

    I will share the file with you shortly by FTAM.

     

    Have you tried with LGDISP?

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited August 2017

    Hi,

    Thank you.
    No I have not used LGDISPL. Kindly let me know about it also.

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited August 2017

    HI,

    I can see intersection in the updated model during run. Also the impactor needs to be moving only in vertical direction.

     

    Thank you.

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

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi Gopal,

     

    Which version of HW are you using?

     

    Does it happen at very begining? Can you share the result and .out files?

     

    I ran the model which I shared and it does not penetrate. 

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited August 2017

    Hi,

    I am using 13 version. I have sent the files. Also the impactor needs to move only in vertical direction and thus I cannot make dof free for impactor rigid.

     

    Thank you

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi Gopal,

     

    I will share large disp setup for the same model and it converges. Please check the results and let us know if you have any issues. 

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited August 2017

    Hi Prakash,

    NLOUT is not supported for 13 version I think. If possible, kindly send me 13 version file.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Gopal,

     

    I suggest you to update to 2017 or 14.0 to use LGDISP. 

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