A Study on The Effect of Compressive Residual Stress on fatigue Crack Propagation Behavior of Spying Steel

스프링강의 피로크랙 진전거동에 미치는 압축잔류응력의 영향

  • 박경동 (부경대학교 기계공학부) ;
  • 정찬기 (부경대학교 기계공학부)
  • Published : 2003.01.01


In this paper, the effect of the compressive residual stresses which were obtained under the various shot velocities of shot balls on the fatigue behaviors of a spring steel, were investigated. The examination of CT specimen test were executed with the materials(JISG SUP9) which are being commonly used for the springs of automotive vehicles. As a result, the optimal shot velocity of shot balls were acquired considering the peak values of the compressive residual stresses on the surface of specimen and effect on the speed of the fatigue crack propagation da/dN in stage II and the threshold stress intensity factor range Δ$K_{th}$ in stage I. Also the material constant C and the crack propagation index m in the formula of paris law da/dN= C $({\Delta}K^m)$ were suggested in this work to estimate the dependency on the shot velocity.


Spring Steel;Shot-peening;Over Peening;Compressive Residual Stress;Fatigue Crack Propagation;Striation


  1. Paris, P. and Erdogan, F., 1963, 'A Critical analysis of crack Propagation Laws', J. Basic Eng., Trans, ASME, pp. 528-534
  2. Tange, A. and Takamura, N., 1990, 'Relation Between Shot-peening Residual Stress Distribution and Fatigue Crack Propagation Life in Spring Steel,' Proc, of the 4th International Conference on Shot Peening, Vol. 1, Tokyo, pp. 243-253
  3. Verpoort, C. M. and Gerdes, C., 1989, 'Influence of Shot Peening on Material Properties of Turbine Blades,' Shot Peening Theory and Application, Institute for Industrial Technology Transfer International, Vol. 1, France, pp. 11-70
  4. Park, K. D. and Jung, C. G., 2001, 'The Effect of Compressive Residual Stresses on Fatigue Strength in DIN50CrV4-SAE9254 Steel,' Transaction of KCORE, Vol. 15, No.3, pp.93-99
  5. Wohlfahrt, H., 1984, 'The Influence of Peening Conditions on the Resulting Distribution of Residual Stress,' Proc. of the 2nd International Conference on Shot Peening, Vol. 1, Chicago, pp. 316-331
  6. Zimmerli, F. P., 1952, 'Heat Treating, Setting and Shot Peening of Mechanical Springs,' Metal Progress, Vol. 67, No.6, pp. 97-106
  7. Cheong, S. K., Lee, S. H., and Chung, S. C., 2001, 'Effect of the Peening Intensity by Shot Peening,' Transaction of KSME, A, Vol. 25, No. 10, pp.1590-1596
  8. Ozone, T. and Hijikata, N, 1988, 'Effect of Processes on Rotating Bending Fatigue Strength of Si-Cr Valve Spring Wire,' Transactions of Japan Society for Spring Research Vol. 33, pp. 53-58