Numerous fracture tests have been performed by EDF and Framatome on various specimen geometries extracted from a 18MND5 ferritic steel plate, in the brittle-to-ductile transition regime. C(T), SEN(T), SEN(B), and non-standard specimens have been tested.

Based on those data, the work presented here proposes a robust identification methodology which allows the prediction of constraint effect with minor consequences of the choices of the Beremin model formulation (classical model or more complex model with a stress threshold, or a plastic strain correction) and on m parameter on the final interpretation.

Results demonstrate geometrical effects, resulting in a temperature shift of KIC distribution of most specimens to higher values than those obtained on C(T) specimens and the capability of the proposed strategy to correctly predict the experimental results.

The final goal of this work is to propose a methodology applicable in Engineering Fracture Mechanics Assessment to gain margins without considering any probability of failure or statistical approach.

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