steel - Nouvelle page 1 - Free
steel - Nouvelle page 1 - Free
steel - Nouvelle page 1 - Free
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MMPDS-01<br />
31 January 2003<br />
Next <strong>page</strong><br />
Figure 2.4.3.1.8. Best-fit S/N curves for notched, K t = 3.0, 9Ni-4Co-0.30C <strong>steel</strong> hand<br />
forging, long and short transverse directions.<br />
Correlative Information for Figure 2.4.3.1.8<br />
Product Form:Hand forging, 3 x 9 inches<br />
Properties: TUS, ksi TYS, ksi Temp.,EF<br />
231 197 RT (LT)<br />
Specimen Details:Notched, V-Groove K t =3.0<br />
0.354 inch gross diameter<br />
0.250 inch net diameter<br />
0.01 inch root radius<br />
60E flank angle, ω<br />
Surface Condition: Not specified<br />
Reference: 2.4.3.1.8<br />
Test Parameters:<br />
Loading - Axial<br />
Frequency - 1800 cpm<br />
Temperature - RT<br />
Environment - Air<br />
No. of Heats/Lots: 3<br />
Equivalent Stress Equation:<br />
Log N f = 7.77-2.15 log (S eq -28.32)<br />
S eq = S max (1-R) 0.79<br />
Std. Error of Estimate, Log (Life) = 0.12<br />
Standard Deviation, Log (Life) = 0.47<br />
R 2 = 93%<br />
Sample Size = 22<br />
[Caution: The equivalent stress model may<br />
provide unrealistic life predictions for stress<br />
ratios beyond those represented above.]<br />
2-90