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NX SimCenter 3D Nastran SOL 106 - Creating 'aligned' GAP elements

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jmarkus

jmarkus

Mechanical
Jul 11, 2001
377
I am trying to simulate contact using SOL 106 using GAP elements in SimCenter 3D. I want my GAP elements to connect 'matched' nodes which I have created on my mesh by projecting a point set along a vector onto each of the 2 meshes which I want to be in contact. I am using the 1D connection function and I wish to be able to select all the points from the first set and all the points from the second set and have the GAP elements connect along the same vector. Unfortunately, whichever 'Method of connection' I try, some of the GAP elements cross over each other, instead of connecting straight down (in the image orientation) to the corresponding node below.

2024-03-13_144722_h17dno.png


I don't want to manually connect each node from one to the other and I was hoping there was a way to enforce the 1D elements to be connected to the nearest node along the vector.

Any suggestions?

Thanks,
Jeff
 
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Dear Jeff,
Reverse the order, we have the same command in FEMAP "Mesh > Connect> Closest Link" and the key is to include in the set "FROM" all the nodes that will have a GAP element for sure and in the other set "TO" the rest of nodes, the command will choose the "nearest" node. This is a useful method to automatically generate a series of connections between two patterns of nodes or between a pattern of nodes and a single node.

closest-link_kwrb9x.png


In my blog of FEMAP here you have a CGAP example of contact Hertz:

cgap8_q90oku.png


Best regards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48004 BILBAO (SPAIN)
WEB: Blog de FEMAP & NX Nastran:
 
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Blas,

Unfortunately (as far as I know), SimCenter 3D doesn't have an option similar to FEMAP 'closest link'. See image from the 1D connections menu.

2024-03-20_150842_ttaxop.png


I'm very new to this, so it's possible that I missing something.

Jeff
 
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looking at the two surfaces, should the nodes be an equal "x" distance apart (as shown), or should they be the same distance apart (should the lower surface nodes be further apart (in "x") to match the arc length of the upper surface (since you want these two nodes to contact).

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.
 
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rb1957,

If I am understanding your question correctly, the nodes are all different distances apart. My expectation is that some gap elements will close before others. Here is a view from the side with the forest of gap elements that I am trying to figure out:

2024-03-21_090949_chpkdw.png


Thanks,
Jeff
 
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why in tarnation are you trying to use gap elements for this? why not just define contact surfaces on each part and then run the analysis?
 
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I only have access to SOL 106. GAP elements are the only way I can simulate contact.

 
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Well, that is simply the wrong code/solution for what you are trying to do.
 
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