journal article·2017-08

Fatigue assessment of welded joints under variable amplitude loading using a novel notch stress approach

T. Nykänen, H. Mettänen, T. Björk, A. Ahola

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Abstract

Abstract Experimental fatigue data for ASW, HFMI and LTT treated joints under VA tensile loading were analyzed using the 3R-method that takes the local stress ratio into account. The main focus of the work was study of how the new approach predicts the fatigue strength of welded joint under VA loading. Equivalent CA notch stress ranges at failure were calculated using a mean master S-N-curve and Miner’s linear cumulative damage rule. All calculated equivalent stress ranges at failure were above the characteristic master S-N-curve, which corresponds to a damage sum of 0.174 at failure, in a case-independent reference notch stress system.
Source: openaire · Quality: candidate unverified · Source record ↗

Research context

OpenAlex topics: Fatigue and fracture mechanics · Mechanical stress and fatigue analysis · Mechanical Behavior of Composites

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References (31)

Show source-provided references
1. Radaj · 2006 · 639
2. Fatigue design of welded joints from the wrought magnesium alloy AZ31 by the local stress concept with the fictitious notch radii of r_f=1.0 and 0.05 mm10.1016/j.ijfatigue.2008.05.017 ↗
3. Schwingfeste Auslegung von Schweissverbindungen aus der Magnesiumknetlegierung AZ31 (ISO-MgAl3Zn1) mit dem Konzept der fiktiven Ersatzradien von r_f=1.0 mm und 0.05 mm10.1002/mawe.200700182 ↗
4. Fatigue design of aluminium welded joints by the local stress concept with the fictitious notch radius of r_f=1 mm10.1016/j.ijfatigue.2005.10.006 ↗
5. Fictitious notch rounding concept applied to sharp V-notches: evaluation of the microstuctural support factor for different failure hypotheses. Part I: basic stress equations10.1016/j.engfracmech.2007.12.011 ↗
6. Fictitious notch rounding concept applied to sharp V-notches: evaluation of the microstuctural support factor for different failure hypotheses. Part II: microstuctural support analysis10.1016/j.engfracmech.2008.01.015 ↗
7. Hobbacher A. Recommendations for fatigue design of welded joints and components. International Institute of Welding, IIW doc. IIW-1823-07/XIII-2151r4-07/XV-1254r4-07; 2007.
8. Fatigue assessment of thin-welded joints with pronounced terminations10.1111/ffe.12164 ↗
9. Fatigue resistance of weld ends10.1016/j.commatsci.2011.01.022 ↗
10. Verification of FAT values for the application of the notch stress concept with the reference radii r_ref=1.00 and 0.005 mm10.1007/BF03263507 ↗
11. S-N lines for welded thin joints - suggested slopes and FAT values for applying the notch stress concept with various reference radii10.1007/BF03266752 ↗
12. Assessment of fatigue strength of steel butt-welded joints in as-welded condition – alternative approaches for curve fitting and mean effect analysis10.1016/j.marstruc.2015.09.005 ↗
13. A new proposal for assessment of the fatigue strength of steel butt-welded joints improved by peening (HFMI) under constant amplitude tensile loading10.1111/ffe.12377 ↗
14. Fatigue assessment of high frequency mechanical impact (HFMI) – improved fillet welds by local approaches10.1016/j.ijfatigue.2013.02.014 ↗
15. Consideration of mean-stress effects on fatigue life of welded magnesium joints by the application of the Smith-Watson-Topper and reference radius concepts10.1016/j.ijfatigue.2012.11.007 ↗
16. Deming · 1943
17. Cumulative damage in fatigue10.1115/1.4009458 ↗
18. Investigation of fatigue damage to welded joints10.1016/j.ijfatigue.2008.04.006 ↗
19. ∗Marquis G, Björk T. Variable amplitude fatigue strength of improved HSS welds. International Institute of Welding, IIW Doc. XIII-2224-08; 2008.
20. ∗Marquis G, Nykänen T, Björk T. Fatigue crack patterns in ultrasonic peened welded structures during constant and variable amplitude loading. In: International conference on “Crack Paths” (CP 2009), Vicenza, Italy; September 2009.
21. Investigation of the fatigue behaviour of the welded joints treated by TIG dressing and ultrasonic peening under variable-amplitude load10.1016/j.ijfatigue.2004.05.009 ↗
22. ∗Vanrostenberghe S, Clarin M, Shin Y, Droesbeke B, van der Mee V, Doré M. FATWELDHSS – improving the fatigue life of high strength steel welded structures by post weld treatments and specific filler material. RFCS grant agreement RFS-CT-2010-00032 Final Report; 2015.
23. ∗Leitner M, Gerstbrein S, Ottersböck MJ, Stoschka M. Fatigue strength of HFMI-treated high strength steel joints under constant and variable amplitude block loading. In: 3rd International conference on material and component performance. Procedia Engineering, vol. 101; 2015. p. 251–8, http://dx.doi.org/10.1016/j.proeng.2015.02.036.10.1016/j.proeng.2015.02.036 ↗
24. Fatigue strength of HFMI-treated and stress-relief annealed high-strength steel weld joints
25. Notch stress analyses of high-frequency mechanical impact-improved welds by using ρf=1 mm and ρf=ρ+1 mm approaches10.1111/ffe.12139 ↗
26. Fatigue strength prediction of ultra-high strength steel butt welded joints10.1111/ffe.12015 ↗
27. Fatigue of high strength steel joints welded with low temperature transformation consumables10.1016/j.engfailanal.2009.02.013 ↗
28. Fatigue strength improvement of welded structures using new low transformation temperature filler materials
29. Dowling · 2007
30. BS 7608 · 1993
31. Ahola A. Effect of loading type on the fatigue of symmetric and asymmetric welded joints made of ultra-high strength steel. Lappeenranta, Finland: Master’s thesis. Lappeenranta University of Technology; 2016.