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How to add constraint to cylindrical elements without tangental-direction

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I am studying FEA using HyperMesh and Optistruct.

Now I'm trying to analyze the stress of cylindrical vessel with support plate.

In accordance with the tutorials, I've created the mesh and load collector, but I don't know how to create constraints to support plate.


In this case, constraints are attached only to the support plate. it cannot translate to vessel's axial direction and its radial direction , but can translate to its tangent direction (the distance between the center of vessel and plate does not change, please refer to the attached picture.)

I know axial constraint can be achieved by adding SPC to all elements with checking dof of axial direction.

But I don't know how to fix the plate only its radial direction.


Thank you,


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Hello Mr. Rahul,


Sorry for late reply, and thank you for your response.

What I wanted to do was achieved by defining the cylindrical coordinate system, and made constraints only its axial and radial direction.


Best regards,

Rahul R likes this

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If it's of help to anyone,

Dofs 1, 2, and 3 are radial, tangential and translation degrees of freedom.

Dofs 4, 5, and 6 are radial, tangential and translation rotational degrees of freedom.


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