General Mechanical

General Mechanical

How to control the DOF of a line Body Beam

    • Masri
      Subscriber

      Hi Guys,

      I wanted to study a line body beam under Buckling, How can I control the Degree of Freedom of this line Body??? 

      For example, I want to prevent the line Body from moving on the Z axis (As shown in Pics)





      Regards

      Masri




       

    • peteroznewman
      Subscriber

      The Z direction is the first buckling mode. Why do you want to prevent that?


      You can assign a Displacement boundary condition of Z = 0 to the line body, then the beam will buckle in the Y direction.

    • Masri
      Subscriber

      Hi Peter


      thnx for replying....Actually that's exactly what I want


      i want to prevent it from moving in  the Z diretion ...then i wanna prevent it from moving in Y direction In order to set he value of each load multiplier these cases 

      -Buckling in Z direction


      -Buckling in Y direction

      -Pure tosion about X axis

      but how can i make that in Ansys???

      beam is defind as line body ...

      the first end is  defined through Remote Displacement 

      (Displacement X Y and Z are 0 , Rotation X is 0 ,Rotation Z and Y are free)

      the second end is defined too through Remote displacement 

      (Displacement X is Free ,Y and Z are 0 , Rotation X is 0 ,Rotation Z and Y are free)....


      but unfortunately when i add the third 
      Remote displacement to prevent the all line Body from moving in Z direction I get an error message
      (An unknown error occurred during solution.  Check the Solver Output on the Solution Information object for possible causes.)



      and a warning message 
      (
      One or more MPC contact regions or remote boundary conditions may have conflicts with other applied boundary conditions or other contact or symmetry regions. This may reduce solution accuracy. Tip: You may graphically display FE Connections from the Solution Information Object for non-cyclic analysis. Refer to Troubleshooting in the Help System for more details.)


       


      and the eigenvalue Buckling could not be solved ....


       

      Regards

      Masri

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