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MMPDS-01 31 January 2003 200 150 150-ksi level 125-ksi level Stress, ksi 100 Normalized 50 TYPICAL 0 0 5 10 15 20 25 30 Compressive Tangent Modulus, 10 3 ksi Figure 2.3.1.2.6(b). Typical compressive tangent-modulus curves at room temperature for heat-treated AISI 8630 alloy steel (all products). 120 500 °F 100 850 °F 80 Stress, ksi 60 1000 °F 40 20 Ramberg-Osgood n (500 °F) = 9.0 n (850 °F) = 19 n (1000 °F) = 4.4 TYPICAL 1/2-hr exposure 0 0 2 4 6 8 10 12 Strain, 0.001 in./in. Figure 2.3.1.2.6(c). Typical tensile stress-strain curves at elevated temperatures for heat-treated AISI 8630 alloy steel, F tu = 125 ksi (all products). 2-30
MMPDS-01 31 January 2003 Figure 2.3.1.2.8(a). Best-fit S/N curves for unnotched 4130 alloy steel sheet, normalized, longitudinal direction. Correlative Information for Figure 2.3.1.2.8(a) Product Form: Sheet, 0.075 inch thick Properties: TUS, ksi TYS, ksi Temp., EF 117 99 RT Specimen Details: Surface Condition: Unnotched 2.88-3.00 inches gross width 0.80-1.00 inch net width 12.0 inch net section radius Electropolished References: 3.2.3.1.8(a) and (f) [Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.] Test Parameters: Loading - Axial Frequency - 1100-1800 cpm Temperature - RT Environment - Air No. of Heats/Lots: Not specified Equivalent Stress Equations: For stress ratios of -0.60 to +0.02 Log N f = 9.65-2.85 log (S eq - 61.3) S eq = S max (1-R) 0.41 Std. Error of Estimate, Log (Life) = 0.21 Standard Deviation, Log (Life) = 0.45 R 2 = 78% Sample Size = 23 For a stress ratio of -1.0 Log N f = 9.27-3.57 log (S max -43.3) 2-31
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