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What is the minimum real-world material data is required for a MAT9 cards to run successfully without errors?
https://2021.help.altair.com/2021.2/hwsolvers/os/topics/solvers/os/matt9_bulk_r.htm?zoom_highlight=mat9
In the example given in the OptiStruct page there are values for G11, G14, G22, G55, A5, GE, only why is this, are these the minimum required data for the card?
if you're using MAT9 i believe that you need to supply all the 21 material constants.
Also there are some stabilityi checks for the material, based on the eignevalues of the G matrix.
Another alternative to MAT9 is MAT9OR which is based in engineering constants (E1, E2, E3,....).
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