한국자동차공학회논문집 (Transactions of the Korean Society of Automotive Engineers)

  • 제16권5호
  • /
  • Pages.1-7
  • /
  • 2008
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  • 1225-6382(pISSN)
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  • 2234-0149(eISSN)
한국자동차공학회 (The Korean Society of Automotive Engineers)
권호 표지

자동차 현가장치재의 부식피로수명에 따른 압축잔류응력의 영향

The Effect of Compressive Residual Stress according to Corrosion Fatigue Life of Automobile Suspension Material

  • 기우태 (부경대학교 대학원 기계공학부) ;
  • 박성모 (부경대학교 대학원 컴퓨터공학과) ;
  • 문광석 (부경대학교 전자공학부) ;
  • 박경동 (부경대학교 기계공학부)
  • Ki, Woo-Tae (Department of Mechanical Engineering, Pukyoung National University) ;
  • Park, Sung-Mo (Department of Computer Engineering, Pukyoung National University) ;
  • Moon, Kwang-Seok (Department of Electronics Engineering, Pukyoung National University) ;
  • Park, Kyeong-Dong (Department of Mechanical Engineering, Pukyoung National University)
  • 발행 : 2008.09.01
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초록

A study of new materials that are light-weight, high in strength has become vital to the machinery of auto industries. But then, there are a lot of problems with developing such materials that require expensive tools, and a great deal of time and effort. Therefore, the improvement of fatigue strength and fatigue life are mainly focused on by adopting residual stress. And Influence of corrosive condition for corrosion fatigue crack was investigated, after immersing in 3.5%NaCl, $10%HNO_3$+3.5%HF, $6%FeCl_3$. The immersion period was performed for 365days. The compressive residual stress was imposed on the surface according to each shot velocity based on shot peening, which is the method of improving fatigue life and strength. Fatigue life shows more improvement in the shot peened material than in the un peened material in corrosion conditions. The threshold stress intensity factor range was decreased in corrosion environments over ambient. Compressive residual stress of surface on the Shot-peen processed operate resistance force of fatigue crack propagation. The fatigue crack growth rate of the Shot-peened material was lower than that of the un peened material. Also m, fatigue crack growth exponent and number of cycle of the shot peened material was higher than that of the un peened material. That is concluded from effect of da/dN.

키워드

참고문헌

  1. D. A. Jones, Principles and Prevention of Corrosion, 2nd Edn., Prentice Hall, New Jersey, 1995
  2. K. D. Park, "A Study on the Effect of Compressive Residual Stress on Fatigue Crack Propagation Behavior of the Shot-peened Spring Steel," Tansactions of KSAE, Vol.11, No.4, pp.117-124, 2003
  3. K. D. Park and C. G. Jung, "The Effect of Compress Residual Stresses for Fatigue Strength of DIN50CrV4-SAE9254 Steel," KSOE, Vol.15, No.3, pp.94-99, 2001
  4. K. D. Park, "A Study of High Temperature Fatigue Crack Growth and Crack Propagation of Low-alloy Steel for Atomic Reactor," Ph. D. Dissertation, Dong-A University, 1983
  5. K. Hideo, Fracture Mechanics, Tokyo, Public Publication, pp.57-63, 131-135, 1993
  6. ASTM : E647-05, Standard Test Method for Measurement of Fatigue Crack Growth Rates, pp.1-45, 2005
  7. Y. B. Lee, H. K. Kim and J. S. Jung, Basic of Fatigue Analysis, pp.99-125, 1999
  8. The Japan Society of Mechanical Engineers, Standard Method of Test for Elastic-Plastic Fracture Toughnees JIC, JSME S 001-1981
  9. Advanced Fatigue Crack Propagation, Instron 2490 Series Application Programs, pp.1-4, 1991
  10. Y. C. Lin and S. C. Chen, "Effect of Residual Stress on Thermal Fatigue in a Type 420 Martensitic Stainless Steel Weldment," Journal of Materials Processing Technology, 2003
  11. M. G. Fontana, Corrosion Engineering, 3rd Edition, McGraw-Hill Book Company, New York, 1986