I thought it might be the Scale Factor in the second buckling calculation.I set the Scale Factor to 0.2.I made a finer grid on the pipe and made a calculation.I got negative parameters for the first two modes:
If you read the documentation, then this means that there will be a crush.I checked with a non-linear calculation, and multiplied my load by nga, the resulting multiplier F * k.It turned out 100000N * 0.16222 \u003d 16222N.This means that the pipe will lose stability at 1.6 tons.I made such a load.But the pipe survived, and the stress was only 30 MPa.
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