pyNastran
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Cross-reference errors
Loading this "official" example: http://www.mscsoftware.com/doc/nastran/mdug/input_files/ch001/ch01.bdf produces cross-reference errors:
KeyError: 'Invalid Hyperelastic Material ID: mid=1\n, which is required by PLPLANE pid=1' card=PLPLANE 1 1 0 GRID
KeyError: 'Invalid Hyperelastic Material ID: mid=2\n, which is required by PLPLANE pid=2' card=PLPLANE 2 2 0 GRID
More information about the example can be found here: https://help.hexagonmi.com/bundle/MSC_Nastran_2022.2_Demonstration_Problems_Manual-Implicit_Nonlinear/resource/MSC_Nastran_2022.2_Demonstration_Problems_Manual-Implicit_Nonlinear.pdf Chapter 1: 2-D Cylindrical Roller Contact
There is no valid material. Per the QRG, a MATHE or MATHP is required. MAT1 is incorrect according to the 2018.2 QRG.