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1D spring stiffness

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"?>

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Altair Forum User

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?

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gopal_rathore

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

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

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

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

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

Hi ,

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

Altair Forum User

@jsk459

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

Altair Forum User

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

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

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!