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. . MMPDS-01 31 January 2003 Maximum Stress, ksi 80 70 60 50 40 30 20 10 4130 Sheet Normalized, Kt=4.0, x Edge and Fillet Notches, Mean Stress = x x 0.0 10.0 x x + 20.0 +++ ++ + x 30.0 + x x +++ + x → Runout + + x x x x + + x x→ x→ + ++ + + + → + + + → +++ + → + + ++ →→ Note: Stresses are based on net section. → → → → → 0 10 3 10 4 10 5 10 6 10 7 10 8 Fatigue Life, Cycles Figure 2.3.1.2.8(d). Best-fit S/N curves diagram for notched, K t = 4.0, 4130 alloy <strong>steel</strong> sheet, normalized, longitudinal direction. Correlative Information for Figure 2.3.1.2.8(d) Product Form: Sheet, 0.075 inch thick Properties: TUS, ksi TYS, ksi Temp., EF 117 99 RT (unnotched) 120 — RT (notched) K t = 4.0 Specimen Details: Notched, K t = 4.0 Notch Gross Net Notch Type Width Width Radius Edge 2.25 1.500 0.057 Edge 4.10 1.496 0.070 Fillet 2.25 1.500 0.0195 Surface Condition: References: Electropolished 3.2.3.1.8(b), (f), and (g) Test Parameters: Loading - Axial Frequency - 1100-1800 cpm Temperature - RT Environment - Air No. of Heats/Lots: Not specified Equivalent Stress Equation: Log N f = 12.6-4.69 log (S eq ) S eq = S max (1-R) 0.63 Std. Error of Estimate, Log (Life) = 0.24 Standard Deviation, Log (Life) = 0.70 R 2 = 88% Sample Size = 87 [Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.] 2-34
MMPDS-01 31 January 2003 Figure 2.3.1.2.8(e). Best-fit S/N curves diagram for notched, K t = 5.0, 4130 alloy <strong>steel</strong> sheet, normalized, longitudinal direction. Correlative Information for Figure 2.3.1.2.8(e) Product Form: Sheet, 0.075 inch thick Properties: TUS, ksi TYS, ksi Temp., EF 117 99 RT (unnotched) 120 — RT (notched) K t = 5.0 Specimen Details: Edge Notched, K t = 5.0 2.25 inches gross width 1.50 inches net width 0.075 inch notch radius Surface Condition: Reference: Electropolished 3.2.3.1.8(c) Test Parameters: Loading - Axial Frequency - 1100-1500 cpm Temperature - RT Environment - Air No. of Heats/Lots: Not specified Equivalent Stress Equation: Log N f = 12.0-4.57 log (S eq ) S eq = S max (1-R) 0.56 Std. Error of Estimate, Log (Life) = 0.18 Standard Deviation, Log (Life) = 0.87 R 2 = 96% Sample Size = 38 [Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.] 2-35
Page 1 and 2: MMPDS-01 31 January 2003 CHAPTER 2
Page 3 and 4: MMPDS-01 31 January 2003 and above
Page 5 and 6: MMPDS-01 31 January 2003 2.1.2.1.4
Page 7 and 8: MMPDS-01 31 January 2003 2.2.0.3 En
Page 9 and 10: MMPDS-01 31 January 2003 9 α, - Be
Page 11 and 12: MMPDS-01 31 January 2003 Heat Treat
Page 13 and 14: MMPDS-01 31 January 2003 Figure 2.3
Page 15 and 16: MMPDS-01 31 January 2003 2.3.1 SPEC
Page 17 and 18: MMPDS-01 31 January 2003 Table 2.3.
Page 27 and 28: MMPDS-01 31 January 2003 200 180 St
Page 29 and 30: MMPDS-01 31 January 2003 120 110 E
Page 33: MMPDS-01 31 January 2003 Figure 2.3
Page 37 and 38: . . MMPDS-01 31 January 2003 140 12
Page 39 and 40: MMPDS-01 31 January 2003 200 200-ks
Page 43 and 44: MMPDS-01 31 January 2003 300 B = 2
Page 59 and 60: . . MMPDS-01 31 January 2003 Maximu
Page 71 and 72: MMPDS-01 31 January 2003 100 Streng
Page 73 and 74: . MMPDS-01 31 January 2003 100 80 P
Page 77 and 78: MMPDS-01 31 January 2003 100 80 F s
Page 79 and 80: MMPDS-01 31 January 2003 2.4.3 9Ni-
Page 81 and 82: MMPDS-01 31 January 2003 9 8 α - B
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MMPDS-01 31 January 2003 200 180 Mo
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MMPDS-01 31 January 2003 /RQJLWXGL
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MMPDS-01 31 January 2003 6KRUW WUD
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