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How to connect 2D Mesh to 3D Mesh?

Wiz211

Hello,

I am using HyperMesh and OptiStruct as Solver.

I want to connect two 3D meshed blocks with a 2D meshed 2mm thin Surface. The Connection is stiff like it is one part or a Welding Connection. So no DOF is allowed at the border of the 2D and 3D elements.

But my test model behaves like a hinge Connection and rotates freely without any deformation.

I already tried to model the Connection with and without an attached Surface. In the end I Always checked the Connection area via Tools - Edges - Preview Equiv - Equivalence and made sure the nodes of the Elements are on Point.

How do i model those geometrical 2D/3D Mesh Transition Areas to get Deformation results?

Model File and Picture is attached.

Thanks in Advance.

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Wiz211

Problem solved.

I used 2D 'Ghost' Elements on the 3D Elements (2D - Edit Element - Create) around the border line in a separate component (with the same material but Density around 0 (0 density -> 'Ghost') to not influence the mass, and double Shell thickness (too thin results in too low stiffness)).

QuyNguyenDai

Problem solved.

I used 2D 'Ghost' Elements on the 3D Elements (2D - Edit Element - Create) around the border line in a separate component (with the same material but Density around 0 (0 density -> 'Ghost') to not influence the mass, and double Shell thickness (too thin results in too low stiffness)).

How about the stiffness of 'ghost' elements? When you set null for density, the 'ghost' elements have no influence on mass of course. That makes sense only when you take into account the gravity effect.