An Examination of the Notch Effect in Fatigue of Carbon Steels Based on Linear Notch Mechanics

Nisitani, Hironobu; Noguchi, Hiroshi; Uchihori, Hisayuki; Nakae, Hiroshi

doi:10.1299/jsmea1988.32.3_439

Cited by 3 publications

(2 citation statements)

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“…Because the fatigue limits may include the statistical scatters, the authors are going to verify the validity of the present method by significant reliable fatigue limits of the various cracked steels in the future. Figure 14 shows the K wUL value obtained from the following equation using the present and past σ w2 values of the specimens with a deep and sharp notch (Nisitani and Nishida, 1970;Nisitani and Endo, 1988;Nisitani et al, 1989;Akiniwa et al, 1996;Takeno and Nisitani, 1998;Kondo et al, 2002a,b;Miyazaki et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

“…The value of ρ 0 = 0.025 mm was used with high-strength steel from ρ 0 = 0.1 at H B > 300 under R = −1. Figure 5 shows the relation between crack length t and the threshold stress intensity factor range K th from the past fatigue data ( K predicted by σ w2 of specimens with a notch depth t and notch radius ρ ρ 0 ) (Nisitani and Nishida, 1970;Nisitani et al, 1989;Nisitani and Endo, 1988). The K th values of 0.45% carbon steel with H V = 180 and 0.3% carbon steel with H V = 168 become constant at t 250 µm and t 470 µm, respectively.…”

Section: Material Specimens and Experimental Proceduresmentioning

confidence: 99%

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Fatigue Limit of Steel with an Arbitrary Crack under a Stress Controlled Constant with a Positive Mean Stress

2005

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In this paper, push-pull fatigue tests of notched specimens under R = −1, 0 and 0.5 are carried out on annealed 0.1% carbon steel and quenched-tempered 0.5% carbon steel with H B 600. The fatigue limit of a long crack, σ w2 , is obtained from that of a notched specimen with a sharp and deep notch whose radius is smaller than the branch point ρ 0 . Using the present and past σ w2 data, the effect of the positive mean stress on the K w of the long crack is evaluated using 3.2H B ( σ B ) and σ S /(3.2H B ), where K w is the stress intensity factor range for predicting the fatigue limit of a metal with an arbitrary crack, σ S is the lower yield stress or 0.2 % proof stress, σ B is the ultimate tensile strength and H B is the Brinell hardness. Although the σ w2 decreases with the mean stress, σ w2 is cut off by the threshold stress σ we of the plastic deformation at the crack tip. For the quantitative prediction of the fatigue limit of a cracked steel with an arbitrary crack length under a positive mean stress, the σ w2 and σ we values are approximated by simple formulae.

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