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Residual stresses was performed in a mock-up of a heat-flux component, foreseen to be part of the first wall of the ITER machine, directly facing the plasma. The component is built of a CFC-Cu joining, obtained by an innovative procedure, brazed to CuCrZr alloy. The strain/stress gradient was evaluated in the three principal directions, both in the CFC and in the CuCrZr alloy.
Two specimens were analysed: one in brazed condition and one after thermal fatigue cycling (50 cycles heating up to 450°C in air, followed by water quench to room temperature).
We analysed the stresses in different points in the two specimens performing a through thickness scanning in three orthogonal directions using a gauge volume of 2 cubic millimeters. More points were considered close to the interface between CFC and the CuCrZr alloy.
We observed some texture in the CFC, due to the presence of the carbon fibers. Anyway we managed to obtain the stress gradient in the two analysed materials and also we observed the influence on the stress level of the thermal fatigue cycling.
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Experiment at HMI, Germany.
M. Schöbel, G. Fiedler, W. Altendorfer, H. Mohammadian, H.P. Degischer,
Supported by the EU through FP5, FP6 and FP7