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I disagree. The links in plane with the pulley are in pure tension as you say, however those perpendicular which sit on the pulley OD are placed in bending as per the FBD below: Some guidance on allowable is given below, which in this case the client is satisfied with (we have lots of margin...

Yes I agree the chain only contacts the OD - so long as the groove is deep enough. However you will see in the sketch below that the links which wrap around the OD are subject to minor bending in addition to tension. I would have thought there would be a strength reduction factor, or a minimum...

Thanks all for your feedback. Unfortunately roller peening doesn't seem to be available in New Zealand where I am based, though I have heard very positive things about the finish and accuracy of the process. Airbus New Zealand have taken a look at the part and agree they have the necessary...

This may help clarify.

Hi I am designing a fatigue resistant shear pin. The pin is essentially a tube with three plugs lightly pressed into the bore. The plugs control the shear planes (double shear). The tube is 50 mm OD (g6), 44 mm ID (H7), 140 mm long. The material is 4140T. Due to the interaction of the plugs...

Thanks all for your input. We completed additional testing with 4140U and 4340U samples. These broke within 2% to 5% of theoretical. I have also located some past data on 4140T samples which also broke within 5% of theoretical. Being a stronger more brittle material made the difference I...

Thanks, that is some very helpful comments. Particularly regarding Ed's experience with higher breaking loads. I see the Monel K-500 in the annealed and aged condition has a fairly high elongation also. I guess it stands to reason the greater a materials elongation the greater the capacity for...

Hi All I am currently redesigning a shear pin for a hydro turbine. The nature of the fluctuating loads makes this a very difficult problem from a fatigue stand-point and the pin solutions are, as a result, novel. As the selected material options are quite ductile I completed bench testing and...