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Numerical analyses of residual stress fields in welded components

: Siegele, D.; Brand, M.; Varfolomeev, I.; Hohe, J.

Rudland, D.L. ; American Society of Mechanical Engineers -ASME-:
ASME Pressure Vessels and Piping Conference 2009. Proceedings. Vol. 6: Materials and fabrication. Part A : Presented at 2009 ASME Pressure Vessels and Piping Conference, July 26 - 30, 2009, Prague, Czech Republic
New York/NY.: ASME, 2010
ISBN: 978-0-7918-4369-7
Pressure Vessels and Piping Conference (PVP) <2009, Prague>
Fraunhofer IWM ()
residual stresses; welding simulation; finite element

Residual stresses in welded components can influence the lifetime significantly. Besides experimental methods of residual stress measurements numerical methods of welding simulation are an important tool to determine the whole residual stress field in a component as a basis for lifetime prediction. As examples, the residual stresses in a core shroud of a boiling water reactor (BWR) and in a cladded plate have been investigated. In case of the core shroud postulated cracks in the residual stress field of the weld have been assessed with respect to possible crack corrosion cracking. For the cladded plate, the numerical simulation of the cladding and heat treatment process was accompanied by measurements of temperature, distortions and residual stresses. In the analysis, the temperature de pendent material properties as well as the transformation behavior of the ferritic base metal were taken into account. The calculated residual stresses show tensile stresses in the cladding followed by compressive stresses in the base metal that are in agreement with measurements with X-ray diffraction technique.