Three identical fatigue specimens (denoted A, B, and C) are fabricated from a nonferrous alloy. Each is subjected to one of the maximum–minimum stress cycles listed in the following table; the frequency is the same for all three tests.
Specimen | σmax(MPa) | σmin(MPa) |
A | +450 | -150 |
B | +300 | -300 |
C | +500 | -200 |
(a) Rank the fatigue lifetimes of these three specimens from the longest to the shortest.
(b) Now, justify this ranking using a schematic S–N plot.
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