Re-analysis of fatigue data for welded joints using the notch stress approach

Abstract Experimental fatigue data for welded joints have been collected and subjected to re-analysis using the notch stress approach according to IIW recommendations. This leads to an overview regarding the reliability of the approach, based on a large number of results (767 specimens). Evidently, there are some limitations in the approach regarding mild notch joints, such as butt joints, which can be assessed non-conservatively. In order to alleviate this problem, an increased minimum notch factor of Kw ⩾ 2.0 is suggested instead of the current recommendation of Kw ⩾ 1.6. The data for most fillet-welded joints agree quite well with the FAT 225 curve; however a reduction to FAT 200 is suggested in order to achieve approximately the same safety as observed in the nominal stress approach.

[1]  Isao Soya,et al.  A method for obtaining conservative S−N data for welded structures , 1988 .

[2]  Lixing Huo,et al.  Discussion on fatigue design of welded joints enhanced by ultrasonic peening treatment (UPT) , 2009 .

[3]  Zuheir Barsoum,et al.  Residual Stress Analysis and Fatigue Assessment of Welded Steel Structures , 2008 .

[4]  Cetin Morris Sonsino,et al.  Fatigue assessment of welded joints by local approaches : Fatigue assessment of welded joints by local approaches , 2006 .

[5]  Naoyuki Suzuki,et al.  Residual Stress Effect on Fatigue Strength of Non-Load-Carrying Cruciform Welded Joints of SM570Q Steel for Welded Structures , 2002 .

[6]  J.-O. Sperle,et al.  Influence of Parent Metal Strength on the Fatigue Strength of Parent Material with Machined and Thermally Cut Edges , 2008 .

[7]  Naoyuki Suzuki,et al.  Shift of S-N Curves with Stress Ratio , 2003 .

[8]  M. Gustafsson,et al.  A Study of Thickness Effect on Fatigue in Thin Welded High Strength Steel Joints , 2006 .

[9]  Wolfgang Fricke,et al.  Full-scale fatigue tests of ship structures to validate the S–N approaches for fatigue strength assessment , 2010 .

[10]  R. Molfino,et al.  A New Software to Evaluate Preheat Temperature and Cost , 2002 .

[11]  Wolfgang Fricke,et al.  Local Stress Analysis and Fatigue Assessment of Bracket Toes Based on Measured Weld Profile , 2007 .

[12]  R Olivier,et al.  WOEHLERLINIENKATALOG FUER SCHWEISSVERBINDUNGEN AUS BAUSTAEHLEN. TEIL 1. STUMPFSTOSS. EINHEITLICHE STATISTISCHE AUSWERTUNG VON ERGEBNISSEN AUS SCHWINGFESTIGKEITSVERSUCHEN. , 1979 .

[13]  S. Budano,et al.  Application of high-strength steel plates to welded deck components for ships and bridges subjected to medium/high service loads , 2007 .

[14]  F. V. Lawrence,et al.  Improving the fatigue performance of fillet weld terminations , 2001 .

[15]  B. Depale,et al.  Efficient lifting equipment with extra high-strength steel , 2007 .

[16]  E. S. Statnikov,et al.  Comparison of Ultrasonic Impact Treatment (UIT) and Other Fatigue Life Improvement Methods , 2002 .

[17]  Dieter Radaj,et al.  Design and Analysis of Fatigue Resistant Welded Structures , 1990 .

[18]  Jakob Isakovich Kleiman,et al.  Rehabilitation and Repair of Welded Elements and Structures by Ultrasonic Peening , 2007 .

[19]  Jes G. Andersen,et al.  Comparison of Post-Weld Treatment of High-Strength Steel Welded Joints in Medium Cycle Fatigue , 2010 .

[20]  C. Sonander.  Ermüdung von geschweißten Kreuzstößen aus WELDOX 1100 , 2000 .

[21]  Cetin Morris Sonsino,et al.  S-N Lines for Welded Thin Joints — Suggested Slopes and FAT Values for Applying the Notch Stress Concept with Various Reference Radii , 2010 .

[22]  A. Galtier,et al.  The Influence of Ultrasonic Impact Treatment on Fatigue Behaviour of Welded Joints in High-Strength Steel , 2004 .

[23]  Cetin Morris Sonsino,et al.  A Consideration of Allowable Equivalent Stresses for Fatigue Design of Welded Joints According to the Notch Stress Concept with the Reference Radii rref = 1.00 and 0.05 mm , 2009 .

[24]  Ohta Akihiko,et al.  Evaluation of effect of plate thickness on fatigue strength of butt welded joints by a test maintaining maximum stress at yield strength , 1990 .