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Need some help in *CONTROL_IMPLICIT_DYNAMICS (LSDyna)

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    • October 25, 2023 at 3:04 am
      mmia1
      Subscriber

      Hi

      I was suggested to use *CONTROL_IMPLICIT_DYNAMICS since my implicit analysis is not converging. I went through a link (http://ftp.lstc.com/anonymous/outgoing/support/FAQ/implicit_guidelines_cards) where GAMMA = 0.60 and BETA = 0.38 were used. I went through the LSDyna manual but not getting enough. 

      Could anyone please help me on the GAMMA and BETA? How I can decide on their values? Thanks.

    • October 25, 2023 at 7:09 pm
      Ushnish Basu
      Ansys Employee

      These are the parameters for the Newmark-beta method, e.g. see

      https://en.wikipedia.org/wiki/Newmark-beta_method

      (or do a Google search for various detailed notes and explanations)

      The values of 0.6 ad 0.38 add some numerical damping in contrast to the default values

      You should not change these values without good reason

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