Application of normalization method to J-R curve testing of SA335 P11 alloy steel at elevated temperature

Elastic-plastic fracture toughness parameters of nuclear piping materials at operation temperature are of significant importance to the integrity assessment and fracture analysis based on EPFM for in-situ nuclear piping structures. Conventional elastic unloading method meets limitations at elevated temperature, while the NDRT (Normalization Data Reduction Technique) performs well without the need for simultaneous crack growth monitoring. J-R curve testing using C(T) specimens are carried out at elevated temperature in this paper. To validate the NDRT, the J-R curve at elevated temperature determined using the elastic compliance method is compared with that obtained by NDRT. The result matches each other very well, which provides a reference for researchers in the investigation of the material fracture property at elevated temperatures. (authors)