Mechanistic modeling of lifetime distribution of SiC/SiC composite claddings

Hu, Chen; Labuz, Joseph F.; Koyanagi, Takaaki; Le, Jia‐Liang

doi:10.1111/jace.18956

Mechanistic modeling of lifetime distribution of SiC/SiC composite claddings

Journal Article · Thu Dec 22 23:00:00 EST 2022 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.18956· OSTI ID:1959569

Hu, Chen ^[1]; ^[1]; ^[2]; ^[1]

Univ. of Minnesota, Minneapolis, MN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Silicon carbide (SiC) fiber-reinforced SiC matrix (SiC/SiC) composites have emerged as a new material candidate for fuel claddings in light water reactors. Recent studies showed that the load capacity of SiC/SiC materials exhibits a considerable statistical variation. Therefore, reliability analysis plays a critical role in design of SiC/SiC composite claddings. Here, this paper presents a probabilistic model for the lifetime distribution of SiC/SiC composites. The model is anchored by a multiaxial stress-based failure criterion and subcritical damage accumulation mechanism. Based on the kinetics of subcritical damage growth, the lifetime distribution of a laboratory test specimen for any given loading history can be calculated. A finite weakest-link model is used to extrapolate the lifetime distribution of test specimens to full-length claddings. It is shown that the damage accumulation mechanism has a strong influence on the lifetime distribution of the cladding. This finding highlights the importance of understanding the static fatigue behavior of SiC/SiC composites. The present analysis also demonstrates an intricate length effect on the failure probability of the cladding, which is expected to play a crucial role in design extrapolation.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725; NE0008785

OSTI ID:: 1959569

Alternate ID(s):: OSTI ID: 1995623

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 106; ISSN 0002-7820

Publisher:: American Ceramic SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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