Shear Fatigue in bolted Connection
Shear Fatigue in bolted Connection
(OP)
I am wondring if there is an endurance limit to adjust the ultimate tensile strength of bolts in fatigue shear loading. I am using Se=.5*Sut for Sut<200ksi developed from the Rotaing-Beam test for tensile fatigue loading.
I am designing a frame that will hold a disc brake system to stop a 1000hp GE Mill motor. I have already reduced the Sp(74000kpsi proof strength) by half Sp=.5*Sps to get a Shear proof strength. I do not know if I have to further reduce my proof strength do to the nature of the Repeated loading conditions (20400lb).
Any help would be great
Thanks
I am designing a frame that will hold a disc brake system to stop a 1000hp GE Mill motor. I have already reduced the Sp(74000kpsi proof strength) by half Sp=.5*Sps to get a Shear proof strength. I do not know if I have to further reduce my proof strength do to the nature of the Repeated loading conditions (20400lb).
Any help would be great
Thanks





RE: Shear Fatigue in bolted Connection
Sps (shear proof strength) = .5*Sp (Proof strength)
RE: Shear Fatigue in bolted Connection
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Shear Fatigue in bolted Connection
Thanks
RE: Shear Fatigue in bolted Connection
Is the joint in pure shear or is the force offset to the joint which would cause the joint to rotate.
regards
desertfox
RE: Shear Fatigue in bolted Connection
My experience is with joints that have high preload to withstand the applied forces.
A recent SAE paper deals with fatigue of joints with low preload. It should provide some insight for you:
h
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Shear Fatigue in bolted Connection