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NX 11 FEA Surface Surface Contact Problem

NX 11 FEA Surface Surface Contact Problem

NX 11 FEA Surface Surface Contact Problem

(OP)
Hi,

I'm new to NX and i've been having some issues.
I'm trying to model the static loading of a wheel on a train. As well as the loadings and constraints i have specified a surface -surface contact between the wheel and the rail. In a previous solution this worked fine but now it doesn't work. Instead rather than a reaction force forming the wheel penetrates the rail.

I don't understand why this happens. I have attached my files, if anyone could help i would really appreciate it.
thanks

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