Frequently the S-N curves for steel can be approximated by a straight line between N=102 and N= 10° cycles when the data are plotted on a log-log scale as shown in the figure for SAE 4140 steel. This implies that S=ANh, where A and b are 7. constants. A. Find b for the 4140 steel for a certain part made from 4140 steel (Figure 17.33). B. Fatigue failures occur after 5 years. By what factor would the cyclic stress amplitude have to be reduced to increase the life to 10 years? Assume the number of cycles of importance is proportional to time of service.

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Frequently the S-N curves for steel can be approximated by a straight line between
N= 102 and N=10° cycles when the data are plotted on a log-log scale as shown
in the figure for SAE 4140 steel. This implies that S= ANh, where A and b are
7.
constants.
A. Find b for the 4140 steel for a certain part made from 4140 steel (Figure 17.33).
B. Fatigue failures occur after 5 years. By what factor would the cyclic stress
amplitude have to be reduced to increase the life to 10 years? Assume the
number of cycles of importance is proportional to time of service.
Transcribed Image Text:Frequently the S-N curves for steel can be approximated by a straight line between N= 102 and N=10° cycles when the data are plotted on a log-log scale as shown in the figure for SAE 4140 steel. This implies that S= ANh, where A and b are 7. constants. A. Find b for the 4140 steel for a certain part made from 4140 steel (Figure 17.33). B. Fatigue failures occur after 5 years. By what factor would the cyclic stress amplitude have to be reduced to increase the life to 10 years? Assume the number of cycles of importance is proportional to time of service.
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