The aluminum alloy 6061-T6 is a material used for some part of experimental reactor for its interesting physical and mechanical proprieties. To respect the European rules on pressure equipments, a material must present some minimal characteristics for toughness and ductility. In particular, a preventive analysis against abrupt break can be performed in order to ensure the integrity of the structure. In this frame, some characterizations of the toughness were undertaken. Some tests present singular propagation at the beginning of the crack propagation. These singular crack propagation brings some difficulties in the interpretation of the testing and in the J0,2BL/JIC determination. It is the reason why a benchmark on the determination of this value for such material was organized between three different laboratories: the LISN of the French atomic commission (CEA), the LC2M of the CEA and the CESMAN of the DCNS industry. All participants receive a piece of the same material and realize some toughness testing according to its own usage. The benchmark allows comparing the different experimental methodology (machining specimen, pre-crack, testing conditions, equipments …) and the interpretation methodology (ASTM 1820 and ISO 12135 application). This leads to propose a list of recommendations on the realization of the toughness testing and more specifically some necessary adaptation of the ASTM 1820 and ISO 12135 standard for such material.

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