Suppose that the fatigue data shown in the Animated Figure: S-N Plot for Steel is for a steel alloy that was tested using bending- rotating tests. A rod of this alloy is to be used for an automobile axle that rotates at an average rotational velocity of 1000 revolutions per minute. Give the maximum lifetimes of continuous driving that are allowable for the following stress levels: (a) 450 MPa i (b) 380 MPa i (c) 310 MPa i hours hours hours

Suppose that the fatigue data shown in the Animated Figure: S-N Plot for Steel is for a steel alloy that was tested using bending- rotating tests. A rod of this alloy is to be used for an automobile axle that rotates at an average rotational velocity of 1000 revolutions per minute. Give the maximum lifetimes of continuous driving that are allowable for the following stress levels: (a) 450 MPa i (b) 380 MPa i (c) 310 MPa i hours hours hours

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Table 4 shows the fatigue data for a ductile cast iron to be used for an automobile axle that rotates at an average rotational speed of 750 revolutions per minute: Table 4: Fatigue data of a ductile cast iron Stress Amplitude Cycles to (MPа) Failure 1 X 105 ЗX 105 1 X 106 3 X 105 1 X 107 ЗX 10 1X 108 248 236 224 213 201 193 193 193 3 X 10$ Make an S-N plot (stress amplitude versus logarithm cycles to failure). What is the fatigue limit for this alloy? Determine the fatigue lifetimes at stress amplitudes of 230 MPa and 175 MPa? Estimate the maximum lifetime of continuous driving that are allowable for the following 250 MPa and 150 MPa stress levels.
Project 3: Table 4 shows the fatigue data of a ductile cast iron to be used for an automobile axle that rotates at an average rotational speed of 750 revolutions per minute: Tuble 4: Fuligue dula of u duclile cust iron Stress Amplitude (МPa) Cycles to Failure 248 1 X 105 236 ЗX 105 224 1X 106 ЗX 106 1 X 107 3 X 107 1 X 108 3 X 108 213 201 193 193 193 a) Make an S-N plot (stress amplitude versus logarithm cycles to failure). b) What is the fatigue limit for this alloy? c) Determine the fatigue lifetimes at stress amplitudes of 230 MPa and 175 MPa? d) Discuss your results.
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