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Article
Fracture Strength and Principal Stress Fields During Crush Testing of the SiC Layer in TRISO-Coated Fuel Particles
Journal of Nuclear Materials
  • Brian C. Davis, Colorado School of Mines
  • Logan Ward, Colorado School of Mines
  • Darryl P. Butt, Boise State University
  • Brent Fillery, Rolls-Royce Deutschland Ltd & Co KG
  • Ivar Reimanis, Colorado School of Mines
Document Type
Article
Publication Date
8-15-2016
Abstract
Diametrical compression testing is an important technique to evaluate fracture properties of the SiC layer in TRISO-coated nuclear fuel particles. This study was conducted to expand the understanding and improve the methodology of the test. An analytic solution and multiple FEA models are used to determine the development of the principal stress fields in the SiC shell during a crush test. An ideal fracture condition where the diametrical compression test best mimics in-service internal pressurization conditions was discovered. For a small set of empirical data points, results from different analysis methodologies were input to an iterative Weibull equation set to determine characteristic strength (332.9 MPa) and Weibull modulus (3.80). These results correlate well with published research. It is shown that SiC shell asphericity is currently the limiting factor of greatest concern to obtaining repeatable results. Improvements to the FEA are the only apparent method for incorporating asphericity and improving accuracy.
Citation Information
Davis, Brian C.; Ward, Logan; Butt, Darryl P.; Fillery, Brent; and Reimanis, Ivar. (2016). "Fracture Strength and Principal Stress Fields During Crush Testing of the SiC Layer in TRISO-Coated Fuel Particles". Journal of Nuclear Matrials, 477, 263-272. http://dx.doi.org/10.1016/j.jnucmat.2016.05.018