Effect of Notch and Residual Stresses on the Fatigue Strength of the Weld Joints - Local Approach Analysis

Hamza Khatib; Khalifa Mansouri; Bachir Salhi; Abderrahmane Yeznasni; Abdelilah Hachim

doi:10.15866/ireme.v11i8.11689

Effect of Notch and Residual Stresses on the Fatigue Strength of the Weld Joints - Local Approach Analysis

Hamza Khatib^(1*), Khalifa Mansouri⁽²⁾, Bachir Salhi⁽³⁾, Abderrahmane Yeznasni⁽⁴⁾, Abdelilah Hachim⁽⁵⁾

^(*) Corresponding author

Authors' affiliations

DOI: https://doi.org/10.15866/ireme.v11i8.11689

Abstract

This paper proposes a local approach to analyze the fatigue strength of weld joints. The approach is based on the analysis of the local mechanical properties in the crack initiation zone, in order to more accurately evaluate the fatigue resistance in stress concentration zones located on the weld bead. This analysis uses the results of tensile tests, micro-hardness tests and fatigue tests to better estimate the distribution of mechanical properties in the volume of the weld bead. The obtained results show the thermal effect of welding on the mechanical properties. The second part of this paper examines the influence of stress concentration on fatigue strength. The numerical modeling of notch influence uses the already obtained local mechanical properties. The numerical modeling results are compared to the experimental results. The comparison shows that our model can approximate the experimental results obtained on the thermally relaxed specimens. The third part of this work proposes a procedure that allows the integration of the influence of residual stresses, in order to estimate the fatigue life of non relaxed welds. The fatigue life will be calculated by considering the effect of the mechanical relaxation on damage progression.
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Keywords

Damage Progression; Fatigue Strength; Notch Effect; Residual Stress; Welded Joint

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References

British standard, Welding, Fusion-welding joints in steel, nickel, titanium, and their alloys (beam welding excluded)–Quality levels for imperfections, (BS EN ISO 5817-2003, 2003, 1-2).

American welding society, Structural welding code-Steel, (AWS D1.1M :2002, 2002, 218).

Sindo Kou, Welding metallurgy, (Wiley interscience, 2003, 124-125).

Régis Blondeau, Metallurgy and mechanics of welding, (Wiley, 94-95, 2008).

J. E. Brumbaugh, R.Miller, Welding pocket reference, (Wiley, Appendix A, 2007, 397-398).

Sindo Kou, Welding metallurgy, (Wiley Interscience, 2003, 414-415).

Weld Tech, MAGMAWELD ESB52-E7018 low hydrogen electrode, (Weld Tech, 1-10).

N.E. Dowling, Mechanical Behavior of Materials (Pearson Education, 2013, 163-164).

Steel Market Development Institute’s, Bar steel fatigue database, http://barsteelfatigue.autosteel.org.

Zachary Lopez, Ali Fatemi, A method of predicting cyclic stress–strain curve from tensile properties for steels, Materials Science & Engineering A,Vol. 55, pp. 540-550, 2012.
http://dx.doi.org/10.1016/j.msea.2012.07.024

M. L. Roessle, A. Fatemi, Strain-controlled fatigue properties of steels and some simple approximations, International journal of fatigue, Vol. 22, pp 495-511, 2000.

Y. Lee, J. Pan, R.B. Hathaway, M. E. Barkey, Fatigue testing and analysis (Theory and Practice), (Elsevier, 2005, 210- 213).
http://dx.doi.org/10.1016/b978-075067719-6/50000-2

H. Khatib, K. Mansouri, B. Salhi, A. Yeznasni, Fatigue strength analysis of welded joints using an experimental approach based on static characterization tests, Contemporary engineering Sciences, Vol. 9, pp. 513-530, 2016.
http://dx.doi.org/10.12988/ces.2016.6320

R. E. Peterson, Notch sensitivity (Metal Fatigue), (McGraw-Hill, 1959, 293-305).
http://dx.doi.org/10.1299/jsmemag.62.491_1806_2

D. Radaj, P. Lazzarin, F. Berto, Generalized Neuber concept of fictitious notch rounding, International Journal of Fatigue, Vol 51, pp.105-11, 2013.
http://dx.doi.org/10.1016/j.ijfatigue.2013.01.005

David Taylor, David Hoey, High cycle fatigue of welded joints: The TCD experience, International Journal of Fatigue, Vol. 31, pp. 20–27, 2009.
http://dx.doi.org/10.1016/j.ijfatigue.2008.01.011

A. Brand A, R. Sutterlin, Calcul des pièces à la fatigue, Méthode du gradient, (Senlis Editions du CETIM, 1980, 1-157).
http://dx.doi.org/10.1002/col.5080170312

Yao Weixing, Stress field intensity approach for predicting fatigue life, International Journal of fatigue, Vol. 15, n. 3, pp. 243-245, 1993.
http://dx.doi.org/10.1016/0142-1123(93)90182-p

H. Adib, G. Pluvinage. Theoretical and numerical aspects of the volumetric approach for fatigue life prediction in notched components, International Journal of Fatigue, Vol. 25, pp. 67-76, 2003.
http://dx.doi.org/10.1016/s0142-1123(02)00040-3

L.-E. Lindgren, Numerical modelling of welding, Computer methods applied in mechanics and engineering, Vol. 195, pp. 6710-6736, 2005.
http://dx.doi.org/10.1016/j.cma.2005.08.018

G. Totten, M. Howes, T. Inoue, Handbook of residual stress and deformation of steel, (ASM International, 2002, 16-18).
http://dx.doi.org/10.1007/978-94-009-1143-7_101

Pietro Paolo Milella, Fatigue and corrosion in metals, (Springer, 2013, 280-284).
http://dx.doi.org/10.1007/978-88-470-2336-9

M.Skorupa, Fatigue crack initiation life prediction for welded joints by low cycle fatigue approach, Fatigue & Fracture of Engineering Materials & Structures, Vol. 13, pp. 597-613, 1990.
http://dx.doi.org/10.1111/j.1460-2695.1990.tb00630.x

Mvola, B., Adaptive Gas Metal Arc Welding Control and Optimization of Welding Parameters Output: Influence on Welded Joints, (2016) International Review of Mechanical Engineering (IREME), 10 (2), pp. 67-72.
http://dx.doi.org/10.15866/ireme.v10i2.7471

Bouazaoui, O., Chouaf, A., Severity of the Residual Stress Depending on the Width of Welding in the Rails, (2016) International Review of Mechanical Engineering (IREME), 10 (7), pp. 523-530.
http://dx.doi.org/10.15866/ireme.v10i7.9730

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