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Evaluation of Crack Occurrence Probability of T-Shape Welded Structures

Published online by Cambridge University Press:  16 June 2011

Y. Hsu ,
W.-F. Wu  and
H.-T. Kuo
Y. Hsu
Affiliation:
General Education Center, Kainan University, Luchu, Taoyuan, Taiwan 33857, R.O.C.
W.-F. Wu*
Affiliation:
Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
H.-T. Kuo
Affiliation:
Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
*
**Professor, corresponding author
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Abstract

Welded structures are vulnerable to fracture due to cracks, especially at the welds. To investigate the safety of T-Shape welded structures used in some construction sites, a method is proposed in this paper to evaluate the crack occurrence probabilities of the structures. Three major factors that affect the crack occurrence are taken into consideration. They are residual stress, diffusible hydrogen content and chemical composition of the weld metal. In the analysis, finite element analysis is performed to find the residual stress distribution of the structures. The uncertainties of diffusible hydrogen content and chemical composition are treated as random variables. The critical cooling time is found and utilized for evaluating the crack occurrence probability of the welded structure. Numerical results indicate that T-shape welded joints lead to higher residual stresses and higher crack occurrence probabilities in comparison with the traditional butt joints. Therefore, more attention should be paid to this kind of welded joints when they are used.

Keywords

Weld qualityCrackT-shape welded jointCrack occurrence probability
Type
Articles
Information
Journal of Mechanics , Volume 27 , Issue 2 , June 2011 , pp. 279 - 286
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2011

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