1D spring stiffness

Udhay Rohith
Udhay Rohith Altair Community Member
edited June 2021 in Community Q&A

Hi All,

 

I want to create spring element for my model. I have created using spring section in hypermesh and used CELAS1 element. I need to define Spring stiffness. For that I have used Property with Spring gap type and PELAS as a card image. Here comes my problem, I need to give 10N/mm stiffness to spring. In property card whatever values I give it to K column, the displacement is same. It is not taking as stiffness. I do not know how it is calculating or  any thing I have missed. Please help me on this?

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

<?xml version="1.0" encoding="UTF-8"?>Opti2.JPG

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2017

    Hi Udhay,

     

    I tried on a simple CLEAS1 element and as the stiffness changes I see change in displacement. 

     

    Can you share the model file with us?

     

    Please note: If you are a commercial customer, you can also contact your local support @ http://www.altairhyp...ortProduct.aspx

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited May 2017

    Hi,

    Have you made a Local coordinate system for the spring and then make the dof update for spring in the same direction of its axis. This should work I think.

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

    Have you made a Local coordinate system for the spring and then make the dof update for spring in the same direction of its axis. This should work I think.

    I think this may help. Maybe the orientation is an issue with the CELAS element in your element. 

  • jsk459
    jsk459 Altair Community Member
    edited March 2018

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.6b9cd16c008b92d8448b64f9c990c1cf.png

    Hi @Prakash Pagadala

     

    I have created a spring model in Optistruct with CELAS and i have created it in Z DOF. But as the result the part is not compressed in Z direction and it flies in another direction. 

     

     

     

     

     

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

    Hi @jsk459

     

    This is strange.

     

    Can you check the stiffness on PELAS?

     

    I have included a sample file. Can you check if the same happens, at your end?

    Unable to find an attachment - read this blog

  • jsk459
    jsk459 Altair Community Member
    edited March 2018

    Hi ,

     

    Now the problem is solved. It is due to the AUTOSPC Constraints

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2018

    @jsk459

     

    OK, thank you for updating. :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20'> 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2018

    sir how to apply spring with damper in my model that actually simulate as a rear suspension of  a motercycle 

    how to give orientation in a 1d>spring panel 

    and what represent these dof 1,dof2 .. .. .. .. dof 6

    help me 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2018

    Hi,

    Have you made a Local coordinate system for the spring and then make the dof update for spring in the same direction of its axis. This should work I think.

  • muhammad ali raza abid
    muhammad ali raza abid Altair Community Member
    edited June 2021
    gopal_rathore said:

    Hi,

    Have you made a Local coordinate system for the spring and then make the dof update for spring in the same direction of its axis. This should work I think.

    Dear Gopal Rathore

    I am trying to do what you mentioned here, but I could not understand how to make Local Coordinate System for the spring? I can make LCS but how to relate it for the spring is my question please!

     

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