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  1. Gabriel93

    Error 4521 (elements perpendicular to their coordinate system x-axis)

    Hello, I have a model that I received as a .nas/.bfd file. When I try to run modal analysis on it, I have in the f06 file fatal errors on 17 elements (the model has a total of 719674 elements) saying: USER FATAL MESSAGE 4521 (MC2THETA) THE X-AXIS OF COORDINATE SYSTEM ... IS PERPENDICULAR TO...

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