Shear Pins Calculations
Shear Pins Calculations
(OP)
I have 3 shear pins 120 deg. apart connecting to concentric pieces of pipe. I want to shear the pins at a given force. My questions are: How do I calculate the shear and do the 3 pins sahre the shear load or individual. If that makes sense?





RE: Shear Pins Calculations
in a failure case all three would share the load. it is common in these "structural fuses" to cut a sharp notch right at a shear plane to provide a predictable failure. using the shear ultimate of three bolts is a very coarse estimate of failure load (since three specimens will vary quite a bit in actual failure load).
what tolerance on the "given load" ? 10% ? 1% ? 0.01% ??
another day in paradise, or is paradise one day closer ?
RE: Shear Pins Calculations
RE: Shear Pins Calculations
another day in paradise, or is paradise one day closer ?
RE: Shear Pins Calculations
RE: Shear Pins Calculations
RE: Shear Pins Calculations
another day in paradise, or is paradise one day closer ?
RE: Shear Pins Calculations
When one pin starts to shear, the movement to allow that to continue depends on the remaining pins also shearing.
If this mode of failure is used as a fuse, the expected shear load will be 2-3X what the pins will nominally fail to make up for variability. They can be more precise with careful dimensional and material properties control.
In your case if there is ductility to the pins, the load will rise up with increasing torque and little relative rotation, plateau with increasing relative rotation, then drop off a little while the relative rotation vs torque ramps up as less and less material remains un-sheared. At the end the torque abruptly drops and relative rotation rises the maximum input rotation rate.
Typically materials are considered failed when there is 1/3 material thickness displacement, but that will vary considerably depending on the material.
RE: Shear Pins Calculations
RE: Shear Pins Calculations
This link shows how to calculate single shear on bolts etc.
http://www.roymechx.co.uk/Useful_Tables/Screws/Bol...
I doubt very much that you will be able to shear three pins simultaneously because tolerances on holes and pins and material properties will have an effect on how the load is shared between pins, why do you need three pins and not one pin what is the reason?
RE: Shear Pins Calculations
RE: Shear Pins Calculations
RE: Shear Pins Calculations
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