Application of FEM to Theoretical analysis, Measurement and Prediction of Welding Residual Stresses(Mechanics, Strength & Structural Design)

概要

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For prediction of welding residual stress, the authors have developed the following three methods using the finite element method: (1) Thermal elasto plastic analysis, (2) Experimental methoed for measurement of three dimensional residual stress using inherent strain (the source of residual stress) as parameter, and (3) Prediction method by elastic analysis using inherent strain which is stored in a data-base. These methods are outlined. Additionally, being paid attention to weld related cracking, a simple model is also presented for prediction of local welding residual stress induced by the last few layers of multi-pass welds. This model is effective for both theoretical analysis and experiments. Welding residual stresses analysed and measured are shown, which are produced in various types of welded joints of thick plates and pipes. These are very useful to estimate welding residual stresses considering the relation to the degree of restraining condition.
大阪大学の論文