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Thread: Stress in Bolt Due To Bending

  1. #1
    Associate Engineer
    Join Date
    Feb 2021
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    1

    Stress in Bolt Due To Bending

    Hello,

    I am new to this forum, so I apologize in advance if I break any forum rules.

    I am currently trying to figure out whether a bolt will elongate due to bending moment. I have attached an image of what I am trying to analyze. Basically, in my mind, I am envisioning this problem almost like a cantilever beam with one end fixed type of problem. On the free end of the beam, a load will be applied in the downward direction. Assuming that the beam does not fail before the bolts do, the beam will bend downwards. Theoretically, this will cause the bolts to elongate and bend.

    I am not concerned with the beam bending, but rather with the bolt bending. I understand that as long as the stress in the bolt does not exceed the yield strength of the bolt, no permanent deformation will occur. I have looked through various different sources (including Shigley's), but I have not found anything that fits my application just right.

    Any type of help/suggestions/guidance would be greatly appreciated.
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  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,400
    I would use a simple lever calculation to determine the force applied by the moment force then add that load to the loading on the bolt from torque.

    See:
    https://www.engineersedge.com/simple_levers_menu.shtml

    and

    https://www.engineersedge.com/calcul...orque_calc.htm

    Force/area = lbs/in^2 then compare to bolt rating.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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