Rotary DOF for rbe2

Karthic_22061
Karthic_22061 Altair Community Member
edited October 2020 in Community Q&A

Hi,

I am trying to simulate the plate spring model in Optistruct.

Image 1-  shows the spring model, its pivot end and a rigid wall

Image 2 - the line in red is the expected deformation of spring by 18.5 degree about Y axis.

image 3 - The green lines shows the required angular displacement(18.5 degree). Its measured from the wall to the free end of spring

 

I have specified the angular displacement value to the independent node of rb2 at the free ends of the spring. 

How can i specify that the center of angular displacement as the point on wall?

 

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

<?xml version="1.0" encoding="UTF-8"?>Capture2.png

<?xml version="1.0" encoding="UTF-8"?>Capture3.png

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2017

    Hi Karthik,

     

    I am a bit confused, sorry,

     

    If the center of the displacement has to be at wall, you need to apply angular displacement at the center of the wall, correct?

     

    Please correct me if I am wrong. 

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited October 2017

    Hi Prakash,

    You mean That i should move my independent node of free end to the wall (as shown in image )

    <?xml version="1.0" encoding="UTF-8"?>Capture4.PNG

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2017

    Karthik,

     

    Not sure what the use case is, but here are two suggestions:

    1) Have angular displacment at wall and check if this helps

    2) have angular displacement at rbe master node and release the inplane dof and constrain rest for the node at wall.

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited October 2017

    Hi Prakash,

    Thank you for the reply, i tried it and now i am facing an issue with contact.

     

    Contact is working but also penetrating.

    There is no initial penetration. I have used surf to surf contact. but during simulation there is penetration?

     

    How can i correct it

    <?xml version="1.0" encoding="UTF-8"?>1.PNG

    <?xml version="1.0" encoding="UTF-8"?>2.PNG

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2017

    @Karthic

     

    What type of contact are you using?

     

    It would be better if you can share the model file so that we can see where the problem is? :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20'> 

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited October 2017

    Hi Prakash,

    I have dropped the file in your FT link.

    I tried interchanging master and slave, tried node to surface, surf to surf for the contact @ the free end side. Please help me to overcome the issue

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited October 2017

    Hi Prakash,

    I tried extending the contact surface and now its working.

    Update me if any findings

     

    Thanks for your Support.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2017

    Hi Karthik,

     

    Glad you are able to run the model.

     

    I did;t check the model as it was weekend. I will check if there is anything I can do

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2018

    Hello Prakash,

    I am applying point mass by creating RBE2 elements. But, I am facing problem while selecting dof. Which dof should be marked??

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2018

    Hi @Rohit Ch

     

    Can you explain what the Dof for?

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