Mechanical Testing of Shear Pin
Mechanical Testing of Shear Pin
(OP)
I have a 3/4" diameter notched shear pin that I would like to test to determine it's shear strength. My mechanical engineering is a little rusty... could I conduct a simple tesile test on the pin and then convert it to shear strength or is there another test that can be done?
Thanks
D
Thanks
D





RE: Mechanical Testing of Shear Pin
RE: Mechanical Testing of Shear Pin
This should allow you to at least quantify the range of shear values that the "unanticipated peripheral effects" will introduce.
RE: Mechanical Testing of Shear Pin
my advice is: if you want to get acceptably accurate results, don't do a tensile test in order to determine the rupture force (in shear) of your pin.
Rather, reproduce with a suitable machine the real fashion in which the shear-pin is acted.
Moreover, don't test a single specimen: as it has been said, shear-pins are sensitive to the notch diameter, which can vary because of tolerances, to the surface finish (more constant, but who knows...) and to the material characteristics of course (which can vary slightly even in the same bar...).
Where I work we use extensively shear-pins as security devices, and the procedure we follow is like I've said: 5 - 10 specimen from the same bar from which the definitive ones will be taken (this makes a 1-to-4 / 1-to-8 sampling), shear-machine applying the force in the exact same way as the "real" system. Nevertheless, we have frequently 5 to 15% dispersion in the results...
Regards