A Comparative Study on the Fatigue Evaluation for Weldments under Out-of Plane Bending Load Using Structural Stress and Hot Spot Stress

Abstract:

Fatigue strength assessments with two types of load carrying fillet weldment under out-of-plane bending load have been carried out by using both hot spot stress and structural stress methods. Basis for the derivation of structural stress method is discussed in detail. Finite element analyses using shell elements models have been performed for the fatigue strength assessment of weldments. As a result of the fatigue strength evaluation for load carrying transverse fillet weldment, hot spot stress method is found to be consistent with structural stress method as well as measurement. Hot spot stress, however, estimated for the load carrying longitudinal fillet weldment exhibit large variation with respect to mesh size and element type while the calculated structural stress for the longitudinal fillet weldment is relatively independent of mesh size. The fatigue life estimation according to structural stress has been introduced with the master S-N curve.

• Periodical: Key Engineering Materials (Volumes 326-328)
• Pages: 995-998
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.326-328.995
• Online since: December 2006
• Authors: Myung Hyun Kim, Chung In Ha, Sung Won Kang, Jeong Hwan Kim, Jae Myung Lee
• Keywords: Bending, Fatigue Strength, Fillet Weldment, Hot Spot Stress, Structural Stress

References

[1] S.W. Kang, M.H. Kim, S.H. Kim and W.I., Ha, in: Journal of the Society of Naval Architects of Korea, Vol. 42, No. 2 (2005), pp.129-135 (in Korean).

[2] P. Dong, P, J.K. Hong, and Z. Cao, in: A Mesh Insensitive Stress Procedure for Fatigue Evaluation of Welded Structures, IIW Doc. No. ��-1902-01/��-1089-01. International Institute of Welding (2001).

[3] S.J. Maddox: The effect of Plate Thickness on the Fatigue Strength of Fillet Welded Joints. The Welding Institute. Abington Hall, Abington, Cambridge (1987): pp.10-12.

[4] T.R. Gurney: Fatigue of Welded Structure. Cambridge University Press. Cambridge (1979).

[5] A. Almær: Fatigue Handbook. Tapir (1985).

[6] E. Niemi: Structural Hot-Sport Stress Approach to Fatigue Analysis of Welded ComponentsDesigner's Guide, III Doc. XIII-1817-00, XV-1090-01, XIII-WG3-06-99 (1999).

[7] P. Dong: Battelle Structural stress JIP Final Report, No. N004431-01 (2003).