Skip to main content
SpringerLink
Log in

The peak stress method for fatigue strength assessment of tube-to-flange welded joints under torsion loading

  • Research Paper
  • Published:
Welding in the World Aims and scope Submit manuscript

Abstract

It was shown in previous papers that in plane problems the elastic tangential stress and the elastic shear stress evaluated at the weld toe or at the root of fillet-welded joints by means of a finite element analysis, with a well-defined pattern of elements, are proportional to the mode I and mode II Notch Stress Intensity Factors (NSIFs), respectively. On the basis of such properties, the so-called Peak Stress Method (PSM) is a simplified, finite element-oriented application of the N-SIF approach to fatigue analysis of fillet-welded joints with un-machined weld seams. In the present paper, the PSM is extended to torsional loading conditions, which induce mode III stresses at the weld toe and at the weld root. First, it is shown that the finite value of the elastic anti-plane shear stress evaluated at the weld toe by means of a finite element analysis is directly proportional to the mode III N-SIF. Afterwards, taking advantage of the strain energy density criterion, an equivalent local stress is derived. Finally, a synthesis of experimental results of fatigue tests on tube-to-flange fillet welded joints subject to torsion loading and failing either from the weld toe or from the weld root is presented.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8

Similar content being viewed by others

References

  1. Lazzarin P, Tovo R (1996) A unified approach to the evaluation of linear elastic fields in the neighbourhood of cracks and notches. Int J Fract 78:3–19

    Article  Google Scholar 

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

    Article  CAS  Google Scholar 

  3. 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  CAS  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(3):225–232

    Article  CAS  Google Scholar 

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

    Google Scholar 

  6. Qian J, Hasebe N (1997) Property of eingenvalues and eingenfunctions for an interface V-notch in antiplane elasticity. Eng Fract Mech 56(6):729–734

    Article  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. Meneghetti G, Lazzarin P (2006) Significance of the elastic peak stress evaluated by FE analyses at the point of singularity of sharp V-notched components. Fatigue Fract Eng Mater Struct 30:95–106

    Google Scholar 

  9. 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 

  10. Sonsino, C. M. (1997). Fatigue strength of welded components under complex elasto-plastic, multiaxial deformations, Report EUR 16024 DE, 1997; Also LBF Report N. 6078 1994.

  11. Yousefi F, Witt M, Zenner H (2001) Fatigue strength of welded joints under multiaxial loading: experiments and calculations. Fatigue Fract Eng Mater Struct 24:339–355

    Article  Google Scholar 

  12. Amstutz H, Störzel K, Seeger T (2001) Fatigue crack growth of a welded tube-flange connection under bending and torsional loading. Fatigue Fract Eng Mater Struct 24:357–368

    Article  Google Scholar 

  13. Seeger T, Olivier R (1987) Tolerable and allowable shear stresses at fatigue loaded welded joints. Stahlbau 8:231–238 (in German)

    Google Scholar 

  14. Seeger T, Olivier R (1992) Slope and knee-point of the S-N curve of shear loaded fillet welds. Stahlbau 61:137–142 (in German)

    Google Scholar 

  15. Yung JY, Lawrence FV (1989) Predicting the fatigue life of welds under combined bending and torsion. In: Brown MW, Miller KJ (eds) Biaxial and multiaxial fatigue, EGF 3. Mechanical Engineering Publications, London, pp 53–69

    Google Scholar 

  16. Siljander A, Kurath P, Lawrence FV (1992) Non proportional fatigue of welded structures. In: Mitchell MR, Landgraf RW (eds) Advances in fatigue lifetime predictive techniques, ASTM STP 1122. American Society for Testing and Materials, Philadelphia, pp 319–338

    Chapter  Google Scholar 

  17. Razmjoo GR (1996) Fatigue of load carrying fillet welded joints under multiaxial loading. Fatigue core research from TWI. Abington Publishing, Abington. ISBN 1855735202

    Google Scholar 

  18. 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 

  19. 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 Fract Eng Mater Struct 26:49–58

    Article  Google Scholar 

  20. 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  CAS  Google Scholar 

  21. Lazzarin P, Livieri P, Berto F, Zappalorto M (2008) Local strain energy density and fatigue strength of welded joints under uniaxial and multiaxial loading. Eng Fract Mech 75:1875–1889

    Article  Google Scholar 

  22. Lazzarin P, Sonsino CM, Zambardi R (2004) A notch stress intensity approach to assess the multiaxial fatigue strength of welded tube-to-flange joints subjected to combined loadings. Fatigue Fract Eng Mater Struct 27:127–140

    Article  CAS  Google Scholar 

  23. Haibach E (1989) Service fatigue-strength-methods and data for structural analysis. VDI, Dusseldorf

    Google Scholar 

Download references

Acknowledgments

Prof. Cetin Morris Sonsino (Fraunhofer Institute for Structural Durability and System Reliability LBF, Darmstadt (Germany)) is gratefully acknowledged for encouraging the present research, for providing experimental data and for stimulating discussion. Prof. Paolo Lazzarin (University of Padova (Italy)) is gratefully acknowledged for stimulating discussion on results obtained in the present paper.

Author information

Authors and Affiliations

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

    Giovanni Meneghetti

Authors
  1. Giovanni Meneghetti
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Giovanni Meneghetti.

Additional information

Doc. IIW-2340, recommended for publication by Commission XIII "Fatigue of Welded Components and Structures".

Rights and permissions

Reprints and permissions

About this article

Cite this article

Meneghetti, G. The peak stress method for fatigue strength assessment of tube-to-flange welded joints under torsion loading. Weld World 57, 265–275 (2013). https://doi.org/10.1007/s40194-013-0022-x

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s40194-013-0022-x

Keywords (IIW Thesaurus)

Search

Navigation