Abstract
In this paper, push-pull fatigue tests of notched specimens under R = — 1, 0 and 0.5 were carried out on annealed 0.1% carbon steel with the Vickers hardness Hv = 105 and quenched-tempered 0.5% carbon steel with HV = 582. The fatigue limit of a long crack, σ W2 was 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 ΔKw of the long crack was evaluated by using 3.2HB (≃ σ B) and σ s/(3.2HB), where ΔKw is the stress intensity factor range for the purpose of 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 HB is the Brinell hardness. Although the σ W 2 decreased with the mean stress, σ W 2 was cut off by the threshold stress σ W 2 of the plastic deformation at crack tip. For the quantitative prediction of the fatigue limit of a cracked steel with an arbitrary crack length under a positive mean stress, he σ W 2 and σ we values were approximated with simple formulae.
| Original language | English |
|---|---|
| Pages (from-to) | 612-619 |
| Number of pages | 8 |
| Journal | Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A |
| Volume | 70 |
| Issue number | 692 |
| DOIs | |
| Publication status | Published - Jan 1 2004 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
Cite this
Quantitative Evaluation of Fatigue Limit of a Metal with an Arbitrary Crack under a Stress Controlled Condition (2nd Report, Steel under a Positive Mean Stress). / Miyazaki, Tatsujiro; Noguchi, Hiroshi; Kage, Masaharu.
In: Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, Vol. 70, No. 692, 01.01.2004, p. 612-619.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Quantitative Evaluation of Fatigue Limit of a Metal with an Arbitrary Crack under a Stress Controlled Condition (2nd Report, Steel under a Positive Mean Stress)
AU - Miyazaki, Tatsujiro
AU - Noguchi, Hiroshi
AU - Kage, Masaharu
PY - 2004/1/1
Y1 - 2004/1/1
N2 - In this paper, push-pull fatigue tests of notched specimens under R = — 1, 0 and 0.5 were carried out on annealed 0.1% carbon steel with the Vickers hardness Hv = 105 and quenched-tempered 0.5% carbon steel with HV = 582. The fatigue limit of a long crack, σ W2 was 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 ΔKw of the long crack was evaluated by using 3.2HB (≃ σ B) and σ s/(3.2HB), where ΔKw is the stress intensity factor range for the purpose of 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 HB is the Brinell hardness. Although the σ W 2 decreased with the mean stress, σ W 2 was cut off by the threshold stress σ W 2 of the plastic deformation at crack tip. For the quantitative prediction of the fatigue limit of a cracked steel with an arbitrary crack length under a positive mean stress, he σ W 2 and σ we values were approximated with simple formulae.
AB - In this paper, push-pull fatigue tests of notched specimens under R = — 1, 0 and 0.5 were carried out on annealed 0.1% carbon steel with the Vickers hardness Hv = 105 and quenched-tempered 0.5% carbon steel with HV = 582. The fatigue limit of a long crack, σ W2 was 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 ΔKw of the long crack was evaluated by using 3.2HB (≃ σ B) and σ s/(3.2HB), where ΔKw is the stress intensity factor range for the purpose of 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 HB is the Brinell hardness. Although the σ W 2 decreased with the mean stress, σ W 2 was cut off by the threshold stress σ W 2 of the plastic deformation at crack tip. For the quantitative prediction of the fatigue limit of a cracked steel with an arbitrary crack length under a positive mean stress, he σ W 2 and σ we values were approximated with simple formulae.
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U2 - 10.1299/kikaia.70.612
DO - 10.1299/kikaia.70.612
M3 - Article
VL - 70
SP - 612
EP - 619
JO - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
JF - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
SN - 0387-5008
IS - 692
ER -