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PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Numerical Evaluation of Residual Stresses in Dissimilar Welds between Carbon and Stainless Steels
C.H. Lee1, K.H. Chang2, G.C. Jang3 and H.C. Park2
1Conventional Rail Engineering Corps, Korea Railroad Research Institute, Uiwang-shi, Korea
C.H. Lee, K.H. Chang, G.C. Jang, H.C. Park, "Numerical Evaluation of Residual Stresses in Dissimilar Welds between Carbon and Stainless Steels", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 151, 2007. doi:10.4203/ccp.86.151
Keywords: similar and dissimilar steel welds, residual stresses, thermo physical and mechanical properties, carbon and stainless steels, finite element analysis.
Residual stresses that developed in and around the welds can be detrimental to the integrity and the service behaviour of the welded part. Tensile residual stresses are generally detrimental, increasing the susceptibility of a weld to fatigue damage, stress corrosion cracking and fracture during service. Moreover, welding of dissimilar steels produces different residual stresses in welds as compared with welding of similar steels. Therefore, a good estimation of residual stresses in dissimilar steel welds is required to assure the sound design and safety of the structure. However, accurate prediction of welding residual stresses is very difficult because of the complexity of welding process which includes localized heating, temperature dependence of material properties and moving heat source, etc. Accordingly, simulation tools based on finite element (FE) method are very useful to predict welding residual stresses.
In this paper, three-dimensional thermal elastic-plastic FE analyses have been performed to investigate the characteristics of residual stresses in dissimilar steel welds between carbon (SM490) and stainless steels (SUS304). Moreover, residual stresses in similar steel weds are examined for the comparison. Some of the key findings are as follows:
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