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Why the anisotropic stiffness matrix in Engineering Data highlighted in yellow?

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    • June 6, 2022 at 9:58 am
      FAQFAQ
      Participant

      The stiffness matrix defined in Engineering Data should be a positive definite one.
      Being positive definite means that the following expression must equal a positive number:
      1.0 – NUXY**2*EX/EY – NUYZ**2*EY/EZ – NUXZ**2*EX/EZ – 2.0*NUXY*NUYZ*NUXZ*EX/EZ

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