A 15 mm diameter nonrotating round bar is made of AISI 1050 cold-drawn steel and has a 3-mm diameter hole drilled transversely through it. This bar is target to have reliability of 90 percent and subject to a fluctuating bending load. It will use in operating environment of 420 degree Celsius. Y=2, T=420 a) Determine the endurance limits, Se for the steel bar? (MPa) Yield strength; Sy (MPa) Tensile strength; Sut (MPa)
A 15 mm diameter nonrotating round bar is made of AISI 1050 cold-drawn steel and has a 3-mm diameter hole drilled transversely through it. This bar is target to have reliability of 90 percent and subject to a fluctuating bending load. It will use in operating environment of 420 degree Celsius.
Y=2, T=420
a) Determine the endurance limits, Se for the steel bar? (MPa)
Yield strength; Sy (MPa)
Tensile strength; Sut (MPa)
Load modification factor; kc
Temperature modification factor; kd
Reliability factor; ke
Miscellaneous effect modification factor; kf
Endurance limits, Se (MPa)
b) because this bar has a discontinuity geometry, compute the fatigue stress concentration factor; Kf.
notch sensitivity; 'q'
Theoretical stress concentration factor at hole; 'Kt'
Fatigue stress concentration factor at hole; 'Kf'
c) calculate modified Goodman factor of safety if this part is design to withstand a fluctuating bending load varying from 20 to 40 Nm. Give conclusion to our answer
Bending load amplitude; 'Ma' (Nm)
Bending load mean; 'Mm' (Nm)
Safety factor
Step by step
Solved in 3 steps with 3 images
