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Gap Axial Force

Dear Femap users,


A simple question. I perform a non linear analysis with gap element. This element is subject to an axial tensile force, but I don't understand why the Gap axial force results is negative.


Gap.PNGGap axial forcePlease, can anyone clarify me this point?

Best regards



Re: Gap Axial Force

Siemens Phenom Siemens Phenom
Siemens Phenom

The Nastran documentation lists that a positive force shows compression. See number 5 in the CGAP bulk data entry of the Nastran Quick Reference Guide.

CGAP Nastran Doc.JPG


Here's a model showing one GAP element in tension and one in compression.
Gap Axial Force.JPG