Fixed Support in Static Structure

- April 16, 2020 at 2:25 pm
  
  usm03
  Subscriber
  
  Hello Everyone,
  
  I have a query regarding fixed support vs real bolted joints.
  
  Actually, I performed a simulation in the static structure on a bracket. This bracket is connected to a body with four bolts joints. That simulation was performed only on the bracket without modeling that connected body by using "fixed support" on the bolted areas.
  
  Now, someone has suggested me to use "displacement with all movements restricted" instead of "fixed support" to have better simulation results.
  
  Is this true? Please explain the logic behind this.
- April 17, 2020 at 4:28 pm
  Wenlong
  Ansys Employee
  Hello,
  
  The text below is from the documentation. (Ref: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v193/wb_sim/ds_Fixed_Supports.html)
  
  So fixed support is the same as use "displacement with all movements restricted"
  
  Regards,
  
  Wenlong
  
  ================ Note ====================
  
  If you have trouble opening the links I attached, please see the first useful link below
  
  Useful Links
- April 18, 2020 at 8:58 am
  
  usm03
  Subscriber
  
  Thanks for clarifying. Which support is suitable for assigning bolted joints which fix the bracket to other body as I have only one body? Will fix support will be enough?
  
  P.S.- Fix support lock 6 DOS.
- April 19, 2020 at 1:57 pm
  
  Wenlong
  Ansys Employee
  
  I think fix support should be enough.
  
  Fix support does not lock 6 DOS in all the cases, for example, if you fix an edge of a shell, it only lock the translational DOFs but still allows rotational DOFs, and that's why there is a "Fix rotation" boundary condition.
  
  If you are using solid elements, there is no rotational DOF for solids, so using fixed support should be fine.
  
  Regards,
  
  Wenlong