The behaviour of strength and fatigue crack propagation of various steels in steel bridges

철강구조물 부재의 강도평가 및 피로균열진전거동

  • Han, Seung-Ho (Structure System Research Center, Korea Institute of Machinery and Materials) ;
  • Kim, Jung-Kyu (Dept. of Mechanical Engineering, Hanyang University)
  • 한승호 (한국기계연구원 구조시스템연구부) ;
  • 김정규 (한양대학교 기계공학부)
  • Published : 1997.10.01


The residual safety assessment of steel structures, an important subject in practice, is given to much attention. Life prediction in the planning course of steel structures under fatigue loading is mainly based on fatigue design criteria resulting from S-N curves. But for any reason cracks have to be assumed due to fabrication failures or fatigue loading in service which can lead total fracture of structures. The life prediction can be carried out by means of fracture mechanics using Paris-Erdogan equation($da/dN=C {\cdot}{\Delta}K^m$). The paper presents results from charpy test to interpret transition behaviour of charpy energy($A_V$) in a wide temperature range and from constant-load-amplitude test to measure fatigue crack growth of various steels widely used in steel bridges since beginning of 20 centuries in Europe. In the normal service temperature range of steel bridges, the steel S355M shows higher maximum charpy energy($A_{Vmax}$) and lower transition temperature($T_{AVmax/2}$) than other steels considered. The C and m of Paris-Erdogan equation on the steels appear to be correlated, and to be affected by the R-ratios due to crack closure, especially at a low fatigue crack growth rate. Scanning electron microscopy analysis was carried out to interpret an influence of the crack closure effects on the correlation of C and m.


  1. J. Of Struct. Eng. v.116 Fatigue Strength of Riveted Bridge Members Fisher, J. W.;Yen, B. T.;Wang. D.
  2. 한국강구조학회논문집 v.7 no.3 덮개판이 부착된 용접 강판형의 피로거동 장동일;김성훈;이승용
  3. Stahlbau v.60 Uberlegungen zur Restlebensdauer SchweiBeiserner Brucken am Beispiel der Basler Wetteinbrucke Taner, P.;Hirt, M. A.
  4. Materiaprifung v.35 Wie sicher sind alte Stahlbauwerke? Wittemann, K.
  5. Remaining Fatigue Life of Steel Structures Method to Back Decision on Residual Safety of Bridges Dahl, W.;Schmmann, O.;Sedlacek, G.
  6. Zugproben, Deutsches Institut der Normung e. V.
  7. Kerbschlagbiegeversuch
  8. Annual Book of ASTM Standard Standard Test Method for Measurement of Fatigue
  9. 대한기계학회논문집 v.12 no.6 복합조직강의 피로균열진전거동과 균열닫힘조건에 미치는 응력비 및 미시조직 크기의 영향 김정규;황돈영
  10. 대한기계학회논문집 v.16 no.7 ΔA를 파라메터로 이용한 피로크랙전파속도에 미치는 재료 및 응력비의 영향에 대한 연구 박영철;오세욱;김광영;허정원;강정호
  11. Eng. Fract. Mech. v.9 Influence of Stress Ratio on the Threshold Level for Fatigue Crack Propagation in High Stregth Steels Ohta, A.;Sasaki, E.
  12. Eng. Fract. Mech. v.15 The Effects of Stress Ratio and Grain size on Near-threshold Fatigue Crack Propagation in Low Carbon Steels Nakai, Y.;Tanaka, K.
  13. Transaction of the ASME J. of Eng. for Industry, Serice B v.93 no.4 Fatigue Crack Propagation in Steels of Various Yield Strength Barsom, J. M.
  14. Int. J. Frac. v.15 The Correlation of Kthvalue with the Exponent, m, in the Situation of Fatigue Crack Growth for Various Steels Tanaka, K.
  15. 대한기계학회논문집 v.12 no.4 5083-H113 Al 합금의 피로균열진전거동에 미치는 균열형태의 영향 김정규;신용승;윤의박
  16. Mechanics and Micromechanics of Fatigue Crack Propagatin Tanaka, K.
  17. Gaseous-Evironment Fatigue Crack Propagation Behaviour of a Low-alloy Steel Liaw, P. K.;Leax, T. R.;Donald, J. K.