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Loading on pin

  1. Jul 27, 2016 #1
    I'm a bit rusty on partial uniform loading on a pin. I want to find the minimum diameter a cold rolled steel pin has to be using a factor of safety of 2 with a loading of 25000 lbs. The pin in the picture is welded between two plates (the right plate bends in and is welded to the left plate below the pin) . These plates are welded to a box (another pin is located on the opposite side of the box). A hook grabs onto this pin. I've tried finding equations regarding partial uniform loading. The equations I've turned up show the center piece the same width as the gap.
     

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  3. Jul 27, 2016 #2

    Mech_Engineer

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  4. Jul 28, 2016 #3
    Thanks for the paper. However, this does not show how the stress changes if the clevis has two different thicknesses. I guess I could take the worst case scenario and use the lesser of the two thicknesses for my t1.
     
  5. Jul 28, 2016 #4

    Mech_Engineer

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    Based on the posts so far I'm guessing that running an FEA model for your specific geometry is not an option?
     
  6. Jul 28, 2016 #5
    You are correct. I was hoping that I could come up with an equation for this type of scenario.
     
  7. Jul 28, 2016 #6

    Mech_Engineer

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    Your scenario is challenging to find an analytical solution for because there is a gap between the inner and outer clevis which will cause a bending load on the pin, and the outer clevis's plates are asymmetric in thickness.

    Have you considered making some assumptions to simplify your modeling task? I think you could consider a beam bending model of just the pin with a simply-supported beam. This would be a "worst-case" analysis because the pin would not be stiffened by the clevis in this case. Otherwise, FEA really may be your best option.
     
  8. Jul 28, 2016 #7
    Yes I've considered beam analysis and I am currently working on this.
     
  9. Jul 28, 2016 #8

    Mech_Engineer

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    Make sure to calculate the Von Mises stress to combine shear and tensile/compressive stresses for your analysis.
     
  10. Jul 28, 2016 #9
    Do you have a 3D model of the same? Its hard to properly understand the system....
    A hand drawn 3D view would also suffice.
     
  11. Jul 28, 2016 #10
    A lifting hook goes around the pin.
     

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  12. Jul 28, 2016 #11

    Mech_Engineer

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    Looks like a questionable strength design to me. How are you evaluating the strength of the bracket holding the pin?
     
  13. Jul 30, 2016 #12
    I would agree with Mech_Engineer, I think you'll find that the 1/4" plate will be a limiting factor in this design.

    Maybe you haven't got there yet, but I think you should check tear out shear on that plate section.
     
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