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Fatigue assessment of weld toe and weld root failures in steel welded joints according to the peak stress method

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Abstract

The peak stress method is an engineering, finite element (FE)-oriented application of the local approach based on the notch-stress intensity factors (NSIFs), which quantify the intensity of the local, linear elastic stress field at the potential crack initiation points (either the weld toe or the weld root). All effects due to plate thickness, joint shape and loading mode (axial or bending) are fully included in the NSIFs, such that a single design curve is sufficient to assess the fatigue strength of arc-welded joints in structural steels, tested in the as-welded conditions. The design stresses to analyse the fatigue strength are the peak stresses evaluated by FEM at the weld toe or the weld root, which are modelled as sharp notches with a tip radius equal to zero. The mean value of the FE size adopted to calculate the singular peak stresses can be chosen within a range of applicability, while the FE pattern of elements to use is the free mesh generated automatically by the Ansys™ numerical code. Due to the rather coarse meshes required to apply the PSM and its suitability to be used directly with results of 3D FE analyses, the method is rather useful in everyday design practice.

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References

  1. Yakubovskii, V.V. and Valteris, I.J (1989) Geometrical parameters of butt and fillet welds and their influence on the welded joint fatigue life. IIW Document XIII-1326–89

  2. Pang HJL (1993) Analysis of weld toe profiles and weld toe cracks. Int J Fatigue 15:31–36

    Article  Google Scholar 

  3. Lazzarin P, Tovo R (1998) A notch intensity factor approach to the stress analysis of welds. Fatigue Frac Eng Mater Struct 21:1089–1103

    Article  Google Scholar 

  4. Lazzarin P, Livieri P (2001) Notch stress intensity factors and fatigue strength of aluminium and steel welded joints. Int J Fatigue 23:225–232

    Article  Google Scholar 

  5. Atzori B, Meneghetti G (2001) Fatigue strength of fillet welded structural steels: finite elements, strain gauges and reality. Int J Fatigue 23(8):713–721

    Article  Google Scholar 

  6. Radaj D, Sonsino CM, Fricke W (2006) Fatigue assessment of welded joints by local approaches, 2nd edn. Woodhead Publishing/CRC Press, Cambridge/Boca Raton Fla

    Book  Google Scholar 

  7. Gross R, Mendelson A (1972) Plane elastostatic analysis of V-notched plates. Int J Fract Mech 8:267–272

    Article  Google Scholar 

  8. Williams ML (1952) Stress singularities resulting from various boundary conditions in angular corners on plates in tension. J Appl Mech 19:526–528

    Google Scholar 

  9. Lazzarin P, Zambardi R (2001) A finite-volume-energy based approach to predict the static and fatigue behaviour of components with sharp V-shaped notches. Int J Fract 112:275–298

    Article  Google Scholar 

  10. Lazzarin P, Lassen T, Livieri P (2003) A notch stress intensity approach applied to fatigue life predictions of welded joints with different local toe geometry. Fatigue Frac Eng Mater Struct 26:49–58

    Article  Google Scholar 

  11. Livieri P, Lazzarin P (2005) Fatigue strength of steel and aluminium welded joints based on generalised stress intensity factors and local strain energy values. Int J Fract 133:247–276

    Article  Google Scholar 

  12. Lazzarin P, Berto F, Radaj D (2009) Fatigue-relevant stress field parameters of welded lap joints: pointed slit tip versus keyhole notch. Fatigue Frac Eng Mater Struct 32:713–735

    Article  Google Scholar 

  13. Atzori B, Lazzarin P, Tovo R (1999) From a local stress approach to fracture mechanics: a comprehensive evaluation of the fatigue strength of welded joints. Fatigue Frac Eng Mater Struct 22(5):369–381

    Article  Google Scholar 

  14. Atzori B, Lazzarin P, Meneghetti G (2008) Fatigue strength assessment of welded joints: from the integration of Paris’ law to a synthesis based on the notch stress intensity factors of the uncracked geometries. Eng Fract Mech 75:364–378

    Article  Google Scholar 

  15. Murakami Y, Miller KJ (2005) What is fatigue damage? A view point from the observation of low cycle fatigue process. Int J Fatigue 27:991–1005

    Article  Google Scholar 

  16. Meneghetti, G (1998) Design approaches for fatigue analysis of welded joints. PhD Thesis, University of Padova (in Italian)

  17. Lazzarin P, Meneghetti G, Berto F, Zappalorto M (2009) Practical application of the N-SIF approach in fatigue strength assessment of welded joints. Welding in the World 53(3/4):R76–R89

    Article  Google Scholar 

  18. Lazzarin P, Berto F, Zappalorto M (2010) Rapid calculations of notch stress intensity factors based on averaged strain energy density from coarse meshes: theoretical bases and applications. Int J Fatigue 32:1559–1567

    Article  Google Scholar 

  19. Fricke W (2013) IIW guideline for the assessment of weld root fatigue. Welding in the World 57:753–791

    Article  Google Scholar 

  20. Radaj D (2015) State-of-the-art review on the local strain energy density concept and its relation to the J-integral and peak stress method. Fatigue Frac Eng Mater Struct 38:2–28

    Article  Google Scholar 

  21. Meneghetti G, Lazzarin P (2007) Significance of the elastic peak stress evaluated by FE analyses at the point of singularity of sharp V-notched components. Fatigue Frac Eng Mater Struct 30:95–106

    Article  Google Scholar 

  22. Meneghetti G (2012) The use of peak stresses for fatigue strength assessments of welded lap joints and cover plates with toe and root failures. Eng Fract Mech 89:40–51

    Article  Google Scholar 

  23. Meneghetti G (2012) The peak stress method applied to fatigue strength assessments of load carrying transverse fillet welds with toe or root failures. Struct Durab Health Monit 8:111–130

    Google Scholar 

  24. Fischer C, Fricke W, Meneghetti G, Rizzo CM (2013) In: B. Brinkmann and P. Wriggers, Hamburg (D) eds. Fatigue strength assessment of HP stiffener joints with fillet-welded attachments using the peak stress method. Proc. 5th Int. Conf. Computational Methods in Marine Engineering MARINE 2013

  25. Meneghetti G, Guzzella C (2014) The peak stress method combined with three-dimensional finite element models to estimate the mode I notch stress intensity factor at the toe of fillet-welded joints. Eng Fract Mech 115:154–171

    Article  Google Scholar 

  26. Meneghetti G, Guzzella C, Atzori B (2014) The peak stress method combined with 3D finite element models for fatigue assessment of toe and root cracking in steel welded joints subjected to axial or bending loading. Fatigue Frac Eng Mater Struct 37:722–739

    Article  Google Scholar 

  27. Meneghetti G, Lazzarin P (2011) The peak stress method for fatigue strength assessments of welded joints with weld toe or weld root failures. Welding in the World 55:22–29

    Article  Google Scholar 

  28. Kang SW, Kim WS (2003) A proposed S-N curve for welded ship structures. Weld J 82:161–169

    Google Scholar 

  29. Kang SW, Kim WS, Paik YM (2002) Fatigue strength of fillet welded steel structures under out-of-plane bending load. Int J KWS 2:33–39

    Google Scholar 

  30. Kim WS, Lotsberg I (2005) Fatigue test data for welded connections in ship-shaped structures. J Offshore Mech Arctic Eng 127:359–365

    Article  Google Scholar 

  31. Lotsberg, I. and Sigurdsson G (2004) Hot spot stress S-N curve for fatigue analysis of plated structures. OMAE-FPSO’04-0014, Int. Conf. Houston, TX

  32. Fricke W (2002) Recommended hot spot analysis procedure for structural details of FPSO’s and ships based on round-robin FE analyses. Int J Offshore Polar Eng 12:40–47

    Google Scholar 

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Author information

Authors and Affiliations

  1. Department of Industrial Engineering, University of Padova, Via Venezia, 1, 35131, Padua, Italy

    Giovanni Meneghetti & Davide Marini

  2. Zamperla Spa, via Monte Grappa 15/17, 36077, Altavilla Vicentina VI, Italy

    Vittorio Babini

Authors
  1. Giovanni Meneghetti
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  2. Davide Marini
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  3. Vittorio Babini
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Correspondence to Giovanni Meneghetti.

Additional information

Recommended for publication by Commission XIII - Fatigue of Welded Components and Structures

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Meneghetti, G., Marini, D. & Babini, V. Fatigue assessment of weld toe and weld root failures in steel welded joints according to the peak stress method. Weld World 60, 559–572 (2016). https://doi.org/10.1007/s40194-016-0308-x

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  • DOI: https://doi.org/10.1007/s40194-016-0308-x

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