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High-cycle and very high-cycle bending fatigue strength of shot peened spring steel

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Abstract

This paper examined bending fatigue strength of shot-peened spring steel under the high cycle fatigue (HCF) and very high cycle fatigue (VHCF), and analyzed the effects of shot-peening on the high strength spring steel through service life. Hourglass shape specimens made of spring steel (Si-Cr alloys) were prepared for the rotary bending fatigue test. Actual local stresses were quantitatively calculated to compensate for the applied stress amplitudes, through which it was clarified that the shot-peening had strongly positive effects on the HCF strength, but rather negative effect on the VHCF strength. The fracturing process examination confirmed that most fish-eye fractures arose at sites deeper than the compressive residual stress zone, which did not prevent the creation of the fish-eye. The fatigue strength improvement in the VHCF range was scarcely expected as a result of the shot-peening treatment.

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Abbreviations

R:

Stress ratio

σ :

Nominal stress of the gauge portion

M:

The maximum bending moment

c:

Distance from the neutral axis to a designated height

I:

Geometrical moment of inertia at the gage part

α:

Stress concentration factor

P:

Load

m:

Fixed test span

d:

Gage part cross-section diameter

Ra :

Average roughness

Rq :

Root mean square

Ktn :

Stress concentration factor

σ0 :

Nominal stress

σa :

Stress amplitude

Nf :

Number of fatigue test cycles

A:

Y-intercept that indicates the initial fatigue strength

B:

Decreasing slope of fatigue strength as the life cycle increases

σf :

Fatigue limit

σu :

Tensile strength

σf0 :

Fatigue limit of unpeened uniaxial specimen

σu0 :

Tensile strength of unpeened uniaxial specimen

σm :

Mean stress

σrd :

The maximum residual stress

R2 :

Regression coefficient

SSR:

Residual sum of squares

SST:

Total sum of squares

σA :

Actual stress

σL :

Local stress

Df :

Diameter of fish-eye

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Acknowledgments

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2019R1A2C1002193). Thanks to the Korea Atomic Energy Research Institute (KAERI) for authorizing the use of XRD.

Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, Graduate School, Hanyang University, Seoul, 04763, Korea

    NohJun Myung

  2. Department of Mechanical Design Engineering, Graduate School, Hanyang University, Seoul, 04763, Korea

    Liang Wang

  3. Department of Mechanical Engineering, Hanyang University, Ansan-si, 15588, Korea

    Nak-Sam Choi

Authors
  1. NohJun Myung
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  2. Liang Wang
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Corresponding author

Correspondence to Nak-Sam Choi.

Additional information

NohJun Myung received his Doctor’s degree from the Department of Mechanical Engineering, Hanyang University, Korea, in 2020. His research interests involve fatigue life analysis and material design.

Liang Wang received his Master’s degree from the Department of Mechanical Design Engineering, Hanyang University, Korea, in 2018. His research interests involve composite analysis and material design.

Nak-Sam Choi is a Professor of Department of Mechanical Engineering, Hanyang University (ERICA), Korea. He received his B.S. in Mechanical Engieering from Seoul National University, Korea, his M.S. in Mechanical Engieering from KAIST, and Ph.D. in Composite Materials & Applied Mechaics from Kyushu University, Japan. His research interests include composites science, fatigue life and microstrain analysis, and nondestructive examination of advanced materials.

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Myung, N., Wang, L. & Choi, NS. High-cycle and very high-cycle bending fatigue strength of shot peened spring steel. J Mech Sci Technol 35, 4963–4973 (2021). https://doi.org/10.1007/s12206-021-1015-0

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  • DOI: https://doi.org/10.1007/s12206-021-1015-0

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