Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
권호 표지

The Improvement of Fatigue Properties by 2-step Shot Peening

2단쇼트피닝에 의한 피로특성의 향상

  • 이승호 (경기공업대학 정밀계측과) ;
  • 심동석 (경기공업대학 정밀계측과)
  • Published : 2003.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, to investigate the effects of 2-step shot peening at the surface of spring steel, tests are conducted on spring steel and shot peened specimens. Various tests are accomplished to evaluate mechanical properties influenced by shot peening process, and fatigue tests are also performed to evaluate the improvement of fatigue strength. And then the residual stresses are examined. The mechanical properties of material did not change so much by shot peening. However, the fatigue strength of notched specimen remarkably increased. In the case of 1-step shot peening, fatigue strength increased by about 20％ than unpeened specimen. Especially, in the case of 2-step shot peening, fatigue strength increased by about 40％, because the residual compressive stress at surface was higher than that of 1-step shot peened specimen. The fatigue strength and life are closely related to the value and position of maximum compressive residual stress by shot peening.

Keywords

References

  1. 構場武夫 外 7人, 金屬材料强度破壞, 日本金屬學會 强度委員會編, 九善, (1964) 323-339
  2. J. K. Xenophon, Shot Peening Viable Method toExtending Component Life, SAE Technical Paper Series 891932, (1989)
  3. 社團法人 日本工業會 情短技術硏業會, Study on the Shot Peening Small Springs Relation between Processing Condition and Improvement of Fatigue Strength, 論文集, 27 (1982) 73-108
  4. H. Wohlfahrt, The Influence of Peening Conditions on the Resulting Distribution of Residual Stress, Proc. The 2nd International Conference on Shot Peening, Chicago, (1984) 316-331
  5. A. Tange, N. Takamura, Relation between Shot-peening Residual Stress Disthbution and Fatigue Crack Propagation life in Sphng Steel, Proc. The 4th Intemational Conference on Shot Peening, Tokyo,(1990) 243-253
  6. K. Natto, T. Ochi, T. Takahashi, T. Suzuki, Effectof Shot Peening on the Fatigue Strength of Carburized Steels, Proc. The 4th Intemational Conference on Shot Peening, Tokyo, (1990) 519-526
  7. K. lida, K. Tosha, Fatigue Strength and Residual Stress Distribution of the work-softened steel by Shot Peening, Proc. The 4th Intemational Conference on Shot Peening, Tokyo, (1990) 233-242
  8. S. K. Lyu, K. Inoue, M. Kato, 'Effect of Surface Treatment on the Strength of Carburized Gear', Proc. Intemational Gearing Conference, London, (1994) 83-188
  9. H. J. PIaster, Blast Cleaning and Allied Processes, The Garden City Press, London, (1973)
  10. Riga-Ku., X-ray Stress Analyrizer Manual, (1991) 9-17
  11. E915, Standard Method for Verifying the Alignment of X-ray Diffraction Instrumentation for Residual Stress Measurement, Annual Book of ASTM Standard, (1993)
  12. J. K. Kim, D. S. Shim, The Variation in Fatigue Crack Growth due to the Thickness Effect, International Journal Fatigue, 22 (2000) 611-618 https://doi.org/10.1016/S0142-1123(00)00032-3
  13. H. S. Kim, S. H. Lee, 스프링장의 피로거동에 미치는 2단 쇼트피닝의 효과, 대한기계학회논문집A, 23(1) (1999) 140-147
  14. D. W. Hammond, S. A. Meguid, 'Crack Propagationin the Presence of Shot- peening Residual Stresses, Engineering Fracture Mechanics, 37(2) (1990) 373-387 https://doi.org/10.1016/0013-7944(90)90048-L