01.04.2015 Views

steel - Nouvelle page 1 - Free

steel - Nouvelle page 1 - Free

steel - Nouvelle page 1 - Free

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

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

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!