The figure below shows the S-N curve of three materials subjected to cyclic fatigue about a mean stress of zero. The materials are pushed back and forth with a maximum stress of 350 MPa and a minium of -350 MPa. What value below best estimates how many more cycles the steel sample can last compared to the aluminium sample? Stress amplitude, S (MPa) 500 400 300 200 100 0 10³ O Infinitely more O 2x10² cycles 104 105 1045 steel O 1x10 cycles O None are close to the correct value O 1x10 cycles O 3x105 cycles 2014-T6 aluminum alloy Red brass 106 107 Cycles to failure, N 108 109 11 1 T 80 70 60 50 40 30 20 10 1010 Stress amplitude (10³ psi) 2

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QUESTION 6
The figure below shows the S-N curve of three materials subjected to cyclic fatigue about a mean stress of zero.
The materials are pushed back and forth with a maximum stress of 350 MPa and a minium of -350 MPa.
What value below best estimates how many more cycles the steel sample can last compared to the aluminium sample?
Stress amplitude, S (MPa)
500
400
300
200
100
10³ 104
Infinitely more
O 2x10² cycles
105
1045 steel
O 1x10 cycles
O None are close to the correct value
O 1x10 cycles
O 3x105 cycles
2014-T6 aluminum alloy
Red brass
1
11
1
11
T
80
70
60
50
40
30
20
10
0
106 107 108 10⁹ 1010
Cycles to failure, N
Stress amplitude (10³ psi)
Transcribed Image Text:QUESTION 6 The figure below shows the S-N curve of three materials subjected to cyclic fatigue about a mean stress of zero. The materials are pushed back and forth with a maximum stress of 350 MPa and a minium of -350 MPa. What value below best estimates how many more cycles the steel sample can last compared to the aluminium sample? Stress amplitude, S (MPa) 500 400 300 200 100 10³ 104 Infinitely more O 2x10² cycles 105 1045 steel O 1x10 cycles O None are close to the correct value O 1x10 cycles O 3x105 cycles 2014-T6 aluminum alloy Red brass 1 11 1 11 T 80 70 60 50 40 30 20 10 0 106 107 108 10⁹ 1010 Cycles to failure, N Stress amplitude (10³ psi)
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