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An assignment for me 401 – machine design course, which covers topics such as fatigue analysis, stress concentration factor, and elevated temperature effects on metals. The assignment includes four problems related to these topics, requiring calculations and explanations for different materials and geometries.
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ME 401 – Machine Design Spring 2009, Assignment 7
Unless otherwise stated, assume reliability of 90% and factor of safety of 1. Complete the remaining problems on the previous assignment (problems 5, 6, 7).
F (cyclic)
Hint: use Fig A-15-12, and a spread sheet. The stress concentration factor is a function of width, so you have a few choices. You could enter values of Kt for 5 to 10 different widths and interpolate, or you can create a graph plotting 3 values of Kt verses w (such as for d/w= 0.15, 0.4, 0.8), plot an exponential trend line to fit these 3 points and use the equation for the trend line to determine the function describing Kt vs w. Double check to make sure the trend line agrees with Fig A-15-12.
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0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0. Plate width (m)
Transmitted force (N)
10 mm dia (for disk’s axle)
w
0.5w
Support bar (5mm X w X 2000mm)
Main structural frame (assume perfectly rigid and fixed in position)
Mounting bracket (assume perfectly rigid)
Support fasteners
25 mm
Rollers to prevent Mounting vertical displacement pin
Width, w Details of disk axle area of support bar
Use this graph to check your own spread sheet. It will difficult to properly complete this assignment without your own correct spread sheet.