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The subcritical crack growth rate in SiC/SiC composites is controlled by the fibre creep rate. Therefore, the examination of the potential for irradiation enhanced creep (IEC) of SiC fibres in a temperature range where thermal creep is not a problem, is crucial for the overall assessment of fibre-reinforced SiC/SiC composites in an irradiation environment.

The bend stress relaxation (BSR) method has been adopted to examine IEC in several advanced SiC fibres, namely Hi-Nicalon, Hi Nicalon Type S, Dow Sylramic, and Tyranno SA. The different fibres were subjected to a constant bend strain of about 0.25% while they were irradiated with 9 MeV protons at temperatures of 600 and 800 C. After the irradiation, the residual curvature was measured and the irradiation creep induced stress relaxation was calculated as a function of dose..

Additional information

Authors: SCHOLZ R, JRC-Institute for Health and Consumer Protection-BMS, Ispra (IT);YOUNGBLOOD G.E, Pacific Northwest Lab. Richland, (US)
Bibliographic Reference: Article published in: Journal of Nuclear Materials 283-287 (2000) pp.372-375. Oral Report given at: ICFRM-9 Conference. Organised by: Pacific Northwest Labs, University of California. Held at: Colorado Springs, (US), 10-15 October, 19
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