steel - Nouvelle page 1 - Free
steel - Nouvelle page 1 - Free
steel - Nouvelle page 1 - Free
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.<br />
.<br />
MMPDS-01<br />
31 January 2003<br />
140<br />
120<br />
4130 Sht Hard, KT=2.0 EN<br />
Mean Stress<br />
0.0<br />
50.0<br />
→<br />
Runout<br />
Maximum Stress, ksi<br />
100<br />
80<br />
60<br />
40<br />
20<br />
Note: Stresses are based<br />
on net section.<br />
→ →<br />
→<br />
→<br />
→<br />
0<br />
10 3 10 4 10 5 10 6 10 7 10 8<br />
Fatigue Life, Cycles<br />
Figure 2.3.1.2.8(g). Best-fit S/N curves for notched, K t<br />
= 2.0, 4130 alloy <strong>steel</strong><br />
sheet, F tu<br />
= 180 ksi, longitudinal direction.<br />
Correlative Information for Figure 2.3.1.2.8(g)<br />
Product Form:<br />
Sheet, 0.075 inch thick<br />
Properties: TUS, ksi TYS, ksi Temp., EF<br />
180 174 RT<br />
Specimen Details:<br />
Surface Condition:<br />
Reference:<br />
Edge Notched<br />
2.25 inches gross width<br />
1.50 inches net width<br />
0.3175 inch notch radius<br />
Electropolished<br />
3.2.3.1.8(f)<br />
Test Parameters:<br />
Loading - Axial<br />
Frequency - 21-1800 cpm<br />
Temperature - RT<br />
Environment - Air<br />
No. of Heats/Lots: Not specified<br />
Equivalent Stress Equation:<br />
Log N f = 8.87-2.81 log (S eq - 41.5)<br />
S eq = S max (1-R) 0.46<br />
Std. Error of Estimate, Log (Life) = 0.18<br />
Standard Deviation, Log (Life) = 0.77<br />
R 2 = 94%<br />
Sample Size = 19<br />
[Caution: The equivalent stress model may<br />
provide unrealistic life predictions for stress<br />
ratios beyond those represented above.]<br />
2-37
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