Fracture commands are not sent to the solver for the modal analysis

- July 24, 2023 at 10:44 am
  
  HEMING LI
  Subscriber
  
  Hi, everyone.
  I am trying to do a modal analysis on a model containing semi-elliptical cracks in workbench. The software told me “Ftacture commands are not sent to the solver for the modal analysis”.
  What should I do? If I have to enter a command what should it be?
  Many thanks
  Li
- July 25, 2023 at 2:19 pm
  
  Mike Rife
  Ansys Employee
  
  Hi Heming
  Please see the Ansys Help -> Workbench Mechanical Help -> Mechanical Application -> Mechanical Users Guide -> Analysis Types; Fracture Analysis. The supported analysis types for included fracture will be listed.
  Mike
- July 25, 2023 at 2:24 pm
  
  David Weed
  Ansys Employee
  
  Hello Li,
  This message is indicating that the commands used in calculating the fracture parameters (e.g., SIF/Jint) are not sent to the modal solver. The reason being is that fracture parameter calculation for a modal solve is not supported. The Mechanical User's Guide explains here that fracture parameters are not calculated for a modal/msup-transient analysis: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/wb_sim/ds_solve_cracks.html
  You may still include the crack in your modal analysis if you wish, but note that with a semi-elliptical crack, there is no contact between the upper and lower crack face surfaces, so interpenetration may occur. You may wish to use a bonded contact pair in this case.

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