General Mechanical

General Mechanical

lateral–torsional buckling … problem with creating the right model

    • Masri
      Subscriber

      Hi guys,

      I need to study a torsional buckling of I-Beam... but I have a big problem with creating the model ... you know thers is tow option :

      1- beam as line body model  

       i am facing a problem when i want to apply the Distributed force .... I dont want to apply the force always direkt on the line body but  on the upper flange like the pics ,,,,,,,Because this case gives the lower load multiplier as the case when force applied direkt on the line body 



       



      2 - as Solid object


      the load is here applied on the upper area ..... in this case i cant applying the load at the center of section (in The opposite of the first case)


       


      could you helping me please .....I just want to adjust the point of distributed load along the line shown in the first  image(3 cases)


       


       


      Regards


      Masri

    • Aniket
      Ansys Employee

      why you can't apply load on center in the solid model case?


      just create a named selection using the worksheet for the nodes at the center (https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v195/wb_sim/ds_NS_Criteria.html) and apply it using nodal force (https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v195/wb_sim/ds_Nodal_Force.html).


      -Aniket


      Guidelines on the Student Community


      How to access ANSYS help links


       

    • Masri
      Subscriber

       Hi Aniket ...... how can i chose the center of this I section to apply the distributed load for the casses shown in the pic?

      the links thar u shared dont open because i have not a custumer accout 

      Regards 

      Masri

    • Aniket
      Ansys Employee

      check my signature for process to open those links.


      -Aniket


      Guidelines on the Student Community


      How to access ANSYS help links

    • Masri
      Subscriber

      not related to my problem .... sorry

    • Aniket
      Ansys Employee

      can you explain how it is not related to your problem?

    • Masri
      Subscriber

      Dear Aniket.

      I didnt mean that i  just want to apply the Distributed force s on the center of upper surface body ,,,, How can i applying the Distributed force using creating a named selection on the center of beam secion>>>>>> please check out this case on the pic and explain me please 


    • Aniket
      Ansys Employee

      Masri,


      I had understood your query in first thread, and the (named selection with worksheet) and (nodal force) are the only two things that you will need to filter out the nodes at the center of the section without needing to split the geometry in geometry modeler.


      following video explains it for faces, you should be able to do the same for the nodes as well.


    • Masri
      Subscriber

      Hi Aniket,


      sorry for my late replying


      I was busy with the critical situation due to the Corona virus in my city , However I divided the solid body in Design modeler causeI could not catch the points located on the body center line  ,So I divided the solid body into two parts as shown in the pic


       


      how can I choose the surface resulting from the division in order to apply the force on it (The surface shown in the image above) ..... selecting by suface did not recognize it ... can u help me to solve this problem?

      Regards

      Masri

    • Aniket
      Ansys Employee

      I hope you and your loved ones are safe and sound. Did you watch the video in previous post? It selects faces and applies worksheet criteria to select the faces that fall in similar criteria. Like I mentioned before you need to select nodes and apply criteria in worksheet. Fiddle around a bit in the named selection you'll understand what I mean.


      Now you have sliced the geometry, so you already have two surfaces at that location. So create a multibody part with shared topology in design modeler so there is a single face shared by top and bottom body. And then simply hide one body and select the face.

    • Masri
      Subscriber

      thnx Aniket... that was the solution. It remains only to evaluate the results because the results differ greatly from manual calculation. I will open a new discussion to figure that out ,,,,

      Regards 

      Masri

Viewing 10 reply threads
  • You must be logged in to reply to this topic.