4. 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 below; the frequency is the same for all three tests. Please rank the fatigue lifetimes of these three specimens from the longest to the shortest and justify this ranking using a schematic S-N plot. Specimen X Y N omax (MPa) +850 +740 +890 Omin (MPa) -530 -420 -490

4. 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 below; the frequency is the same for all three tests. Please rank the fatigue lifetimes of these three specimens from the longest to the shortest and justify this ranking using a schematic SN plot. 4. 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 below; the frequency is the same for all three tests. Please rank the fatigue lifetimes of these three specimens from the longest to the shortest and justify this ranking using a schematic SN plot