Fatigue Behavior of Blast-treated Out-of-plane Gusset Fillet Welded Joints

다국어 초록 (Multilingual Abstract)

Blast cleaning prior to coating has been applied in newly built steel structures for cleaning forged surface and increasing adhesive property of applied coating systems. However, the effect of surface preparations by blast cleaning treatment on fatigue behavior of welded joints is not considered in Fatigue Design Codes. In this paper, fatigue tests were carried out on four types of out-of-plane gusset fillet welded joints, as-welded gusset specimens and three types of blast-treated gusset specimens, and then the effect of the blast cleaning treatment on the fatigue behavior of the welded joints was studied. The radius of curvature at weld toe of the blast-treated specimens was larger than that of as-welded specimens. The fatigue test results showed that the fatigue life of the blast-treated specimens is longer than that of as-welded specimens in low stress ranges, even though there is no significant difference in fatigue life between the two types in high stress ranges. Over 167% increase in fatigue limit could be realized by using blast cleaning treatment.

참고문헌 (Reference)

1 mmerli, F.P., "Shot Blasting and Its Effect on Fatigue Life"

2 IIW(International Institute of Welding-IIW/IIS), "Recommendations on Fatigue of Welded Components"

3 Nussbaumer, A., "On the Practical Use of Weld Improvement Methods" 95-105, 2001

4 Manteghi, S., "Methods for Fatigue Life Improvement of Welded Joints in Medium and High Strength Steels" 2006

5 ESDEP(The European Steel Design Education Programme) WG12, "Lecture 12.12-Determination of Stress Intensity Factors" // www.esdep.org/members/master/wg12/toc.htm>

6 AASHTO, "LRFD Bridge Design Specifications" SI Units 2007

7 Kusko, C.S., "Influence of Stress Ratio on Fatigue Crack Propagation Behavior of Stainless Steel Welds" 59s-64s, 2004

8 Haagensen, P.J., "Fatigue of High Strength Steels" p.23-24 23-24, 2001

9 JSSC(Japan Society of Steel Construction), "Fatigue design recommendations for steel structures" Gihodo Shuppan 1993

10 Maddox, S,J., "Fatigue Strength of welded Structures" EWI Edison Welding Institute, Abington Publishing 1991

11 Fisher, J.W., "Fatigue Strength of Welded A514 Steel Beams" The Welding Institute 135-148, 1971

12 Yamada, K., "Fatigue Strength of Tension Members with Welded Gussets and Life Estimation by Fracture Mechanics" 1986

13 Lihavainen, V.M., "Fatigue Strength of Longitudinal Attachment Improved by Ultrasonic Impact Treatment" International Institute of Welding 1990

14 Sougata Roy, John W. Fisher, "Enhancing Fatigue Strength by Ultrasonic Impact Treatment" 한국강구조학회 5 (5): 241-252, 2005

15 Mashiri, F.R., "Effects of Weld Profile and Undercut on Fatigue Crack Propagation Life of Thin-Walled Cruciform Joint" 39 (39): 261-285, 2001

16 Ohta, A., "Effect of Residual Stresses on Threshold Level for Fatigue Crack Propagation in Welded Joints of SM50B Steel" 50 : 31-38, 1981

17 Sander, W.W., "Effect of Internal Geometry on Fatigue Behaviour of Welded Joints" 44 (44): 19s-55s, 1965