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134 R.P KAUFMAN AND TH. TOPPER
1000
40 MPa Mean Stress
100 MPa Mean Stress
0-60 MPa Mean Stress
+ Fully Open (T-C Overload) [25]
10
1.00E+03 1.00E+04 1.00€+05 1.00€+06 1.00E+07
Fatigue Life
Fig. 7. Fatigue life data for various levels of static mean stress applied normal to the planes of
maximum alternating shear stress for SAE 1045 steel, BHN 203. The"crack face interference
free" data was reported by Bonnen [25] and Varvani-Farahani [26].
-400 -200 0 200 400 600
Mean Stress IMPa)
1 o 10 000 Cycles Fatigue Limit 1
Fig. 8. Relationship between the alternating shear stress on the maximum shear planes and static
mean stress for two fatigue lives for hard SAE 1045 steel, BHN 456.
