Solid_beam combine

[ice_man]

Why is my model failing to run. I get this error msg "Your design study terminated abnormally, Fatal error!!!"

I have attached the jpg for your reference. Thanks in advance.View attachment 4099

 

[giggione666]

probably you do not fix teh rotation of the beam around beam X axis, in fact solid don not consider rotaions at nodes

 

[miya]

The problem is that your model has 1 rigid body mode. The beam element can rotate about the X-axis in the WCS (the vertical direction in your figure). This is because beams have 6 DOF per node and the solid elements have 3 DOF per node.

Possible remedies to connect the rotation DOF of the beam element to the main components:

1. Use shell elements for your two components instead of the default solid elements. The 6 DOF in shells will connect up with the 6 DOF in the beams.

2. Create a Weighted Link Connection by using one of the datums points and a small surface region around that datum point.

3. Mask a layer of shell elements on top of the solid elements using a small surface region around one of the datum points.

4. Constraint one of the datum points in the WCS X rotation. This may be okay since your model appears symmetric about YZ plane and the beam element passes through the plane of symmetry, so the beam won't rotate about the X-axis anyway.

Each of the above methods will have its pros and cons depending on the actual application and the relative sizes of the main components VS the beam element. (I assume your figure above is a simple "prove out case" and the actual application is a bit more complex.)

Hope that helps.
Ray.
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Ray Miya

 

[mhinkkanen]

One additional tip:
- create surface region on solid surface which has shape exactly same as beam cross section (in the neighborhood of PNT0)
- connect beam element endpoint to surface region with rigid link

Plase note that the area of surface region will move "rigidly".