J Value Estimation of Specimen Containing Dissimilar Metal Welds

In 2012 the research project MULTIMETAL was started within the 7th Framework Programme for Research and Technological Development of the European Union. The aim of the project is to develop a standard for measuring the fracture resistance of multi-metallic specimen and the development of harmonized procedures for dissimilar metal welds (DMWs) brittle and ductile integrity assessment. DMWs connect ferritic and austenitic stainless steels and are present in a number of primary piping systems in light water reactors. They contain a number of different material zones, i.e. ferritic zone, austenitic zone, weld material and heat affected zones which differ significantly in their material properties and fracture behavior. The MULTIMETAL project involves an extensive test program in which standard geometry specimens (CT, SENB, SENT) are cut from mock-ups containing DMWs resembling real DMWs from NPPs in terms of geometry, material and weld procedure. These specimens contain different material zones as described above. A part of the project includes performing numerical analyses to estimate fracture parameters such as stress intensity factors K, J-integral values and extraction of eta (ηpl) factors for different crack positions and crack lengths. In this paper the results of the numerical analyses performed by JRC so far in multi-metallic specimens are presented.

SIMONOVSKI Igor;  MARTIN Oliver;  MACHINA Gangadhar;  SZAVAI S;  BELEZNAI Robert; 

2015-02-13

Nuclear Society of Slovenia

JRC90310

978-961-6207-37-9,   

https://publications.jrc.ec.europa.eu/repository/handle/JRC90310,