Question

A cylindrical 1045 steel bar is subjected to repeated compression-tension stress cycling along its axis. If the load amplitude is 66,700 N, compute the minimum allowable bar diameter to ensure that fatigue failure will not occur. Stress amplitude, S (MPa) 80 500 70 60 400 1045 steel 50 300 40 2014-T6 aluminum alloy 200 30 100 0 Red brass 20 10 0 1010 Stress amplitude (103 psi) 103 104 105 106 107 108 109 Cycles to failure, N Figure 1. Stress magnitude S versus the logarithm of the number N of cycles to fatigue failure for red brass, an aluminum alloy, and a plain carbon steel.

          A cylindrical 1045 steel bar is subjected to repeated compression-tension stress
cycling along its axis. If the load amplitude is 66,700 N, compute the minimum
allowable bar diameter to ensure that fatigue failure will not occur.
Stress amplitude, S (MPa)
80
500
70
60
400
1045 steel
50
300
40
2014-T6 aluminum alloy
200
30
100
0
Red brass
20
10
0
1010
Stress amplitude (103 psi)
103 104 105 106 107 108 109
Cycles to failure, N
Figure 1. Stress magnitude S versus the logarithm of the number N of cycles to
fatigue failure for red brass, an aluminum alloy, and a plain carbon steel.

A cylindrical 1045 steel bar is subjected to repeated compression-tension stress
cycling along its axis. If the load amplitude is 66,700 N, compute the minimum
allowable bar diameter to ensure that fatigue failure will not occur.
Stress amplitude, S (MPa)
80
500
70
60
400
1045 steel
50
300
40
2014-T6 aluminum alloy
200
30
100
0
Red brass
20
10
0
1010
Stress amplitude (103 psi)
103 104 105 106 107 108 109
Cycles to failure, N
Figure 1. Stress magnitude S versus the logarithm of the number N of cycles to
fatigue failure for red brass, an aluminum alloy, and a plain carbon steel.

Added by William H.

Question

Please give Ace some feedback