Accurate prediction of residual stress in stainless steel welds

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• 作者：M.C. Smith^a ; ^{mike.smith@edf-energy.com} ; ^{mike.ann.smith1@me.com} ; P.J. Bouchard^b ; M. Turski^b ; L. Edwards^c ; R.J. Dennis^d
• 关键词：Weld residual stress ; Mixed hardening ; Annealing ; Finite element method ; Measurement ; Validation
• 刊名：Computational Materials Science
• 出版年：2012
• 出版时间：March 2012
• 年：2012
• 卷：54
• 期：Complete
• 页码：312-328
• 全文大小：1945 K

文摘

Measurements of stress-strain properties and residual stress in purpose-designed one and three-pass groove-weld specimens are used to optimise a mixed hardening constitutive model for simulating residual stresses in austenitic Type 316 stainless steel weldments. It is demonstrated that isotropic hardening over-predicts the tensile magnitude of welding residual stress in the benchmark specimens, while pure kinematic hardening gives an under-prediction of longitudinal stresses in parent material close to the weld. The most accurate predictions are those based on optimised mixed isotropic-kinematic formulations combined with a multi-pass moving heat source welding analysis.