Circular Plate Bending
Circular Plate Bending
(OP)
Please see attachment. I am trying to find a good accurate way to solve the problem attached. Any help would be greatly appreciated. Thanks
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RE: Circular Plate Bending
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RE: Circular Plate Bending
Not to be picky, but the problem is incorrectly stated. You can't avoid bending in this situation, unless you have no load. The issue is to avoid material failure or excessive deflection.
RE: Circular Plate Bending
RE: Circular Plate Bending
Could those bolts see increased load due to the leverage? sorry, my mind is blocked on the correct term for this. As in angle hanger brackets.
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Circular Plate Bending
RE: Circular Plate Bending
RE: Circular Plate Bending
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Circular Plate Bending
RE: Circular Plate Bending
RE: Circular Plate Bending
BA
RE: Circular Plate Bending
RE: Circular Plate Bending
Due to symmetry, I think you could reasonably assume the plates were fixed at the bolt circle.
RE: Circular Plate Bending
Use circular plate of bolt circle diameter, fixed edges, concentrated load in center..
Resulting thickness computed for maximum specified deflection at center of plate should give a reasonable value for thickness.
Ed.R.
RE: Circular Plate Bending
RE: Circular Plate Bending
Checking deflection can be done using Equation (88) from "Theory of Plates and Shells".
Checking bending moment in the vicinity of the clip is not quite so easy because of its rectangular cross section. The force P on the sketch must be pretty substantial if ten 1.5" diam. bolts are needed to resist it. Perhaps the force should be applied to the plate by a round hollow section welded all around its circumference to the plate. The clip could be welded to the inside of the cylinder.
BA
RE: Circular Plate Bending
Regards,
![[pipe] pipe](https://www.tipmaster.com/images/pipe.gif)
Qshake
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RE: Circular Plate Bending
If you are really interested in some meaningful comments and ideas on you problem, it would be interesting to know a bit more about what you are trying to accomplish or what's driving the sketch you have shown. It's good to have shown a sketch, but without more detail, one immediately begins to wonder, why is he trying so hard to make his problem difficult.
If you are concerned about circular plate stress and deflection, why on earth would you use a 60" bolt circle? Why not 24" or less? With 10 - 1.5" bolts, what is the load P? You will have multi-axial stress concentrations at the four corners of the pulling lugs, a tearing stress, as they are so unsymmetrical wrt the bolt circle and the rest of the lug connection. This is also an area on the lug/plate weld which is difficult to make and prone to stress raisers in the weld itself. BA's idea of a large pipe welded to the circular plate at least gives you a symmetric and relatively uniform loading between the bolt circle and the pulling load. Then, as he suggests, you can detail the actual lifting lug inside the stiffening pipe. All of these connections and load paths are much more easily rationalized.
Why not make your lifting lug 20 or 24" long, weld it to the plate, and put 5 bolts equally spaced, on either side of the lug about 3" from the lug. Then you basically have a cantilever on each side of the pulling lug, and the rest of the plate can be any shape you want. You didn't indicate that there is really anything going on out there at the 72" circle.
RE: Circular Plate Bending
I have one question and that is what is the value of the load P.
desertfox
RE: Circular Plate Bending
Mtotat = PL/4 then divide that by two for each direction.
pre-tension the bolts like other posts suggested
check min thickness for prying action