General Mechanical

General Mechanical

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computation of stress in prestressed bolts

    • mahdi2019
      Subscriber

       


      I work on the determination of the constraints on bolts M48 which serve to maintain two seals glued to each other, the external load applied work on a plane which comes to solicit my bolts in tracation and shear,


      my question is how to know if my results are consistent or not

    • peteroznewman
      Subscriber

      Please create many screen snapshots of the Supports, Loads, Contacts , Analysis Settings, the Engineering Data page for the Materials used in the Model and the Mesh. Then create many screen snapshots of the Results and Warning Messages. Make sure to zoom in on the area of high stress. Do a Mesh Refinement Study.  Show a snapshot of that graph. Insert those snapshots into a long and detailed reply.  Include a Hand Calculation that shows the result you expect to get from the model.

    • mahdi2019
      Subscriber

      I created a simplified model with the same loading and positioning conditions as my structure, I obtained results that do not allow me to see the constraints on my bolts. but on everything when I calculate the reaction on my bolt preload the results are not very coherent. I made several captures of my model. please i would like to have your help boxbolt loadfixed supportload cylinderload cylinderprentension boltpretension bolt

    • peteroznewman
      Subscriber

      Please show the Frictional Contacts between the two halves of the box, and between the top of the box and the bolt heads.


      Please show the Total Displacement Results.


      Please show the N-R Residual Force plot from the Solution Information folder.


      Please show your hand calculation, what you expected to get.

    • mahdi2019
      Subscriber

      i dont understand how you can plot the N-R force ?

    • peteroznewman
      Subscriber

      After the solve has finished, under the Solution Branch is a Solution Information folder.


      On the Solution Output line, select Force Convergence from the pull down.



       

    • mahdi2019
      Subscriber

    • peteroznewman
      Subscriber

      It looks like it solved nicely. What was the result you got and what result were you expecting?

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