Community Research and Development Information Service - CORDIS


Fracture Mechanics Based Embrittlement Modelling (FRAME)

Project ID: FIKS-CT-2000-00101
Funded under: FP5-EAECTP C


The FRAME project shows that fracture toughness characterisation of irradiated materials using small three-point bend specimens can be made consistently and without bias between the partner laboratories according to the Master Curve standard ASTM E1921. Tight descriptions for the embrittlement shifts based on material chemistry were derived in the project. The shifts were described by copper, phosphorus and nickel terms. Pressure vessel steels and model alloys were studied in the project. Sensitivity of model alloys to phosphorus impurity content was found to be five times higher than sensitivity of steels as concerns transition temperature shifts. Model alloys also have large portions of intergranular fracture on specimen fracture surfaces, which is assumed to explain the difference in the behaviours.
FRAME data were also compared with several Charpy-V-based trend curves. The PNEA and Reg. Guide 1.99-rev.1 were observed to work well when applied to relevant types of materials. The shift formula derived from the FRAME data works better than any trend curve formulas and the explanation is believed to be in the single parameter irradiation behind the data. The FRAME database is small and the FRAME formula is not proposed to be used as a trend curve. However, FRAME data suggests that creation of more generic trend curves might be feasible if variation of material chemistry, neutron doses, and irradiation temperatures inherent in large surveillance databases could be minimised.

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