Hello!,
Well, this is a question related with meshing on NX Advanced Simulation, not directly with NX NASTRAN solver, but I will try to explain (by the way, all is in the manuals ..):
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MESH MATING CONDITION: this is a task done in the FEM environment of NX AdvSim, at the meshing level, simply performing maesh mating condition command between two parts of an assembly will create imprints in the geometry to make sure that both meshes are coincident (matching) and then node merging will be performed at the meshing time to satisface the continuity on displacements condition between both parts. if for any reason the mesh could not be coincident, then multipoint constraints or rigid elements will created by the mesher to allow gluing both parts. But remember, all is done at the meshing level (FEM environment). You have three options:
- Glue Coincident condition: makes both the geometry and the meshes match between the source and the target faces.
- Glue Non-Coincident condition: the mesher creates connections between the meshes on the source and target faces.
- Free Coincident condition: the mesher aligns the meshes on the source and the target faces. The software does not create any connections between the meshes.
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SURFACE-TO-SURFACE CONTACT: this task is donde in the SIM environment of NX AdvSim, here you can define a GLUE surface-to-surface contact between SOURCE and TARGET regions, or NO PENETRATION surface-to-surface contact between regions. The GLUE condition allows to define a rigid joint between two surfaces, where the NO PENETRATION CONTACT condition prevents the penetration between regions but allows to freely separate. This task is done during the solution phase of the NX NASTRAN solver.
You can either specify the contacting surfaces manually, or you can have the software automatically determine which pairs of faces come in contact with each other.
- To manually specify source and target surfaces in the contact definition, you can select an existing Simulation Region or create a new one.
- To have the software automatically determine the contacting surfaces, you can use the Create Automatic Face Pairs dialog box to specify the criteria the software uses to search for surfaces.
Best regards,
Blas.
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Blas Molero Hidalgo
Ingeniero Industrial
Director
IBERISA
48004 BILBAO (SPAIN)
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