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How do I add contact surfaces for a transient dynamic analysis

How do I add contact surfaces for a transient dynamic analysis

How do I add contact surfaces for a transient dynamic analysis

(OP)
I'm doing a transient analysis with an acceleration input. However my model contains many segregated portions that are held together w/ pins and latches. I'm not sure how to set up contact surfaces without having a 3d mesh. I've got tubes joining in a T that are both modeled with plate elements due to the computational needs. That T is held w/ a latch and block that keeps the vertical tube of the T from moving in the x,y direction. The block is bolted to the horizontal tube. The two tubes are held together with a latch that's bolted to the horizontal tube and held with a hook on the vertical tube.

Right now I've got an RBE 2 with the master node on the bolt hole and the slave nodes attached to the ends of the vertical tube that touch the horizontal tube. The theory is that we can get the forces on the rigid and then weigh that against the latch design strength and bolt shear.

My fear is that this becomes too stiff and won't give accurate results. Therefore I was thinking I could use contact surfaces but the only way I know how to do this is with solids which causes my model to be so large it crashes. Is there a way to tell two plates coming together that they can separate but "You shall not pass!" for an NX Nastran transient dynamic analysis?

RE: How do I add contact surfaces for a transient dynamic analysis

Hi,

Have you tried the surface to surface and edge to surface contact capabilities in Femap?

Seifeddine Naffoussi, Stress Engineer

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