Evaluation of Factors Affecting the Fatigue Behavior of Butt-Welded Joints using SM520C-TMC Steel

다국어 초록 (Multilingual Abstract)

To evaluate the factors affecting fatigue behavior of butt-welded joints, fatigue tests and tension tests were conducted on
SM520C-TMC steels with thicknesses ranging from 20 mm to 80 mm. When the fatigue strength of 20 mm thick plate is
achieved, the reduction of the fatigue strength of 80 mm thick plate by the present study is improved by over 11.7% to that
of previous studies. For fatigue behavior, the reduction in fatigue strength was influenced more significantly by the effect of
the geometry of the toe of the weld than by the softening effect. Therefore, the major determinant of fatigue life is the stress
concentration factor depending on the shape of the weld zone. These are the same results as those reported in previous research
with small-sized tests.

다국어 초록 (Multilingual Abstract)

To evaluate the factors affecting fatigue behavior of butt-welded joints, fatigue tests and tension tests were conducted on
SM520C-TMC steels with thicknesses ranging from 20 mm to 80 mm. When the fatigue strength of 20 mm thick plate is
achieved, the reduction of the fatigue strength of 80 mm thick plate by the present study is improved by over 11.7% to that
of previous studies. For fatigue behavior, the reduction in fatigue strength was influenced more significantly by the effect of
the geometry of the toe of the weld than by the softening effect. Therefore, the major determinant of fatigue life is the stress
concentration factor depending on the shape of the weld zone. These are the same results as those reported in previous research
with small-sized tests.

참고문헌 (Reference)

1 Kim, K. N., "Thickness Effects on the Fatigue Strength of ButtWelded Specimens using SM520C-TMC Steel" 18 (18): 847-855, 2004

2 Kim, J. K, "The variation in fatigue crack growth due to the thickness effect" 22 : 611-618, 2000

3 Gurney,T.R, "The influence of thickness on the fatigue strength of welded joints" 523-534, 1981

4 Bellett, D, "The fatigue behaviour of threedimensional stress concentrations" 27 : 207-221, 2005

5 Booth,G.S, "The effect of Thickness on the Fatigue Strength of Plate Welded Joints" 1987

6 Yong, H. S, "The Fatigue of TMCP Steel" 7 : 193-202, 1995

7 Noda, N. A, "Stress concentration formula useful for all notch shape in a round bar" 28 : 151-163, 2006

8 N’Diaye, A, "Stress concentration factor analysis for notched welded tubular T-joints" 29 : 1554-1570, 2007

9 Zheng, H, "Stress concentration and fatigue of profiled reinforcing steels" 10 : 767-773, 1998

10 Nishida,M, "Stress Concentration" Morikita Ink 1971

11 Makkonen,M, "Statistical size effect in the fatigue limit" 23 : 395-402, 2001

12 Youn, J. G, "Softening Phenomenon of TMCP Steel" 6 (6): 9-18, 1988

13 Hobbacher,A, "Recommendations for Fatigue Design of Welded Joints and Components.” IIW doc. XIII-1593-96/XV-845-96. Abington Publ., Abington, Cambridge"

14 Berge,S, "On the effect of plate thickness in fatigue of welds" 21 : 423-435, 1985

15 Tsay, L. W, "Microstructures and fatigue crack growth of EH36 TMCP steel weldments" 21 : 857-864, 1999

16 Korean Society of Civil Engineers, "Korean Design Code and Commentary for Highway Bridge" KiMoonDang., Inc 115-123, 2008

17 Korda, A. A, "Effects of pearlite morphology and specimen thickness on fatigue crack growth resistance in ferriticpearlitic steels" 428 : 262-269, 2006