General Mechanical

General Mechanical

Problem with Bolt pretension Meshing and Solving

    • vipinkrish
      Subscriber

      Hi,


      I am trying to simulate a butterfly valve which has the base fixed, a small force of 100 N on the lever, a pressure of 0.5 MPa on the interior surface and 6 bolt pretension. 



      I can able to solve the model for all the other boundary conditions but when i try to simulate the model with bolt pretension not even for one bolt the model working and throwing error as shown below.


      I created a local coordinate system for every bolt and assigned it to the bolt pretension. I gave bonded contacts for the bolt stem regions and for the nut and head portion i gave frictional contact.


      I meshed the model with 30 mm mesh as shown below. Even i tried meshing it with Multizone method on that particular bolt stem bodies alone but no help.



      .


      Kindly help me resolve this issue as my whole degree depends on this. Thanks in Advance

    • peteroznewman
      Subscriber

      Is the bolt shaft face split at the plane of the top of the part where either a Nut begins or another part with a "threaded" hole?


      You don't want the same face to have both a bonded contact for a nut and a bolt pretension, that creates a conflict.  After you split the face, there is no conflict because there are two faces, one for the bolt pretension and one for the bonded contact.

    • vipinkrish
      Subscriber

      Yes Peter, i gave a bonded contact between the top part and the shank. I will make these as one single component and try running the model.

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