2. the shaft shown below is supported by bearings at each end
1. 2. The shaft shown below is supported by bearings at each end
and rotates 500 rpm. The bearing ID is 20mm,
dimension a = 54 mm, D = 40 mm, and radius R = 2 mm. The
material is SAE 1137 Cold Drawn Steel (which is
the same as machined). Use a material factor; Cm = 1.0, a type
of stress factor; Cst = 1.0, a reliability factor CR
= .81, and the size factor; Cs = .95reliability of 99%
a. What is the Actual Estimated Endurance Strength (s’n) of the
material.
b. What is the factor of safety (N) at the dimension a = 53 mm.
Include the stress concentration factor.
c. What is the factor of satety (N) at the load.