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Fatigue Life Estimation of Welding Details by Using a Notch Strain Approach

노치변형률법을 적용한 용접구조상세의 피로수명평가

  • 한정우 (한국기계연구원 구조연구부) ;
  • 한승호 (한국기계연구원 구조연구부) ;
  • 신병천 (한국기계연구원 구조연구) ;
  • 김재훈 (충남대학교 기계설계공학)
  • Published : 2004.07.01

Abstract

An evaluation of fatigue life of welded components is complicated due to various geometrically complex welding details and stress raisers in vicinity of weld beads, ego under cuts, overlaps and blow holes. These factors have a considerable influence on the fatigue strength of welded joints, as well as the welding residual stress which is relaxed depending on the distribution of local stress at the front of the stress raisers. To reasonably evaluate fatigue life, the effect of geometries and welding residual stress should be taken into account. The several methods based on the notch strain approach have been proposed in order to accomplish this. These methods, however, result in differences between analytical and experimental results due to discrepancies in estimated amount of relaxed welding residual stress present. In this paper, an approach that involves the use of a modified notch strain approach considering geometrical effects and a residual stress relaxation model based on experimental results was proposed. The fatigue life for five types of representative welding details, ego cruciform, cover plate, longitudinal stiffener, gusset and side attachment joint, are evaluated using this method.

Keywords

Fatigue Life;Welding Details;Stress Raiser;Welding Residual Stress;Notch Strain Approach

References

  1. Jeon, Y., Kim, Y., Kang, J. and Han, J., 2001, 'A Study on Fatigue Life Prediction of Welded Joints Through Fatigue Test and Crack Propagation Analysis,' J. of the Society of Naval Architects of Korea, Vol. 38, No.3 pp. 93-106
  2. Pinho da Cruz, J., 2000, 'Fatigue Life Prediction in AlMgSi1 Lap Joint Weldments,' International Journal of Fatigue, Vol.22, pp. 601-610 https://doi.org/10.1016/S0142-1123(00)00023-2
  3. Peterson, R., 1959, 'Notch Sensitivity,' Metal Fatigue, New York, McGraw Hill, pp. 293-306
  4. Smith, K., Watson, P. and Topper, T., 1970, 'A Stress-Strain Function for the Fatigue Damage,' J. Mater., Vol. 5, No.4, pp. 767-778
  5. Higashida, Y., 1987, 'Strain-Controlled Fatigue Behavior of ASTM A36 and A514 Grade F Steels and 5083-0 Aluminum Weld Materials,' Welding J. Vol. 53, pp. 334-344
  6. Reemsnyder, H., 1981, 'Evaluating the Effect of Residual Stresses on Notched Fatigue Resistance,' Materials, Experimentation and Design in Fatigue, pp. 273-295
  7. Vormwald, M. and Seeger, T., 1987, 'Crack Initiation Life Estimations for Notched Specimens with Residual Stresses Based on Local Strains,' Residual Stresses in Science and Technology, pp. 743-750
  8. Welding Material, 2000, KISWEL
  9. Han, J., Lee, T., Han, S. and Kim, J., 2002, 'Application of Fatigue Life Assessment Considering Residual Stresses for Various Welded Details,' Proceeding of KCORE Conference, pp. 125-129
  10. Han, S., Han, J. and Shin, B., 1998, 'Fatigue Strength Estimation and Fatigue Design of Welded Members under Hot-Spot Stress Concept,' Transactions of KSME A, Vol. 22, No. 11, pp. 2072-2083
  11. Han, S., Han, J., Shin, B. and Kim, J., 2003, 'Fatigue Life Estimation of Welded Components Considering Welding Residual Stress Relaxation and Its Mean Stress Effect,' Transactions of KSME A, Vol. 27, No. 1, pp. 175-182 https://doi.org/10.3795/KSME-A.2003.27.1.175
  12. Lawrence, F., Burk, J., and Yung, Y., 1982, 'Influence of Residual Stress on the Predicted Fatigue Life of Weldments,' ASTM STP 776, pp. 33-43
  13. ASSHTO, 1986, 'Evaluation of Fatigue Tests and Design Criterion Welded Details,' NCHRP Report 286
  14. Eurocode3, 1992, 'Design of Steel Structures concerning Fatigue,' ENV 1993-1-1
  15. Partanen, T. and Niemi, E., 1996, 'Hot-Spot Stress Approach Fatigue Strength Analysis of Welded Components : Fatigue Test Data for Steel Plate Thicknesses up to 10mm,' Fatigue Fract. Engng. Mater. Struct., Vol. 19, No. 6, pp. 709-722 https://doi.org/10.1111/j.1460-2695.1996.tb01316.x
  16. Iida, K., 1983, 'Application of the Hot Spot Strain Concept to Fatigue Life Prediction,' Doc. IIS/IIW-780-83
  17. Han, S. and Shin B., 2000, 'The Use of Hot Spot Stress for Estimating the Fatigue Strength of Welded Components,' Steel Research 71, No. 11, pp. 466-473 https://doi.org/10.1002/srin.200005716
  18. BS5400, 1980, 'Code of Practice for Fatigue,' Steel, Concrete and Composite Bridges Part 10, British Standards Institution

Cited by

  1. Fatigue Assessment of High Strength Steel Welded Joints Under Bending Loading vol.38, pp.10, 2014, https://doi.org/10.3795/KSME-A.2014.38.10.1163