How to model spring?

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A
Hi
 I have a general question. I was wondering how springs are modeled. For instance an assembly that consists actual spring.
How they should be modeled modeled? should the spring be meshed or it should be replaced by specific type of element? what kind of analysis is usually performed? what are the inputs and out puts?
Is there any tutorial related to spring modelling?
I appreciate if you give me some explanation in this regard.
 
Thanks,

 

Tagged:

Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited November 2020

    You can make use of CBUSH element for your requirement.

    Using this element you can specify stiffness in all the 3 translational & 3 rotational directions. Attaching the CBUSH card info FYR.
    But when you define more than one stiffness value for BUSH element, you would need to create a local coordinate system for other directional stiffness.
    In order to do this create a local system and then card edit the BUSH element > toggle on CONT > pick the local system under CID field, attaching the image FYR.
    Hope this helps.Refer Optistruct user guide for detailed information.
     

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

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2016

    2016-10-11_8-22-54.jpg

     

    Thank you very much for your reply Rahul

    I Have the following spring and I have meshed it with tetra element. Then I defined PBUSh property and assigned that to the component. Is that correct?

     

     

     

     

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited October 2016

    Spring CBush is 1D element & spring property could be defined via PBush element.If you are interested in Spring failure then it would be good to model spring with tetrahedral element.If you want to use spring just to transfer load & moment then 1d approach would be good.Let me check if i have same file for 1d Cbush element.

    <?xml version="1.0" encoding="UTF-8"?>CBUSH_1d.JPG

  • mecjos
    mecjos Altair Community Member
    edited April 2020
    Altair Forum User said:

    Spring CBush is 1D element & spring property could be defined via PBush element.If you are interested in Spring failure then it would be good to model spring with tetrahedral element.If you want to use spring just to transfer load & moment then 1d approach would be good.Let me check if i have same file for 1d Cbush element.

    <?xml version="1.0" encoding="UTF-8"?>CBUSH_1d.JPG

     

     

    How can we model the spring as 3d.. I want to see stresses on the spring.. What type of material should be used for spring?

  • FaroukM
    FaroukM Altair Community Member
    edited April 2020
    Altair Forum User said:

     

     

    How can we model the spring as 3d.. I want to see stresses on the spring.. What type of material should be used for spring?

     

    In this case, CBUSH element does't work. You have to design a 3D CAD for the spring and then run a static analysis or non linear static analysis ....

Categories