Miniaturized fracture stress tests for thin-walled tubular SiC specimens

T. S. Byun, E. Lara-Curzio, R. A. Lowden, L. L. Snead, Y. Katoh

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46 Scopus citations

Abstract

Two testing methods have been developed for miniaturized tubular specimens to evaluate the fracture stress of chemically vapor deposited (CVD) SiC coatings in nuclear fuel particles. In the first method hoop stress is applied to a thin-walled tubular specimen by internal pressurization using a polyurethane insert. The second method is a crushing technique, in which tubular specimen is fractured by diametrical compressive loading. Tubular SiC specimens with a wall thickness of about 100 μm and inner diameters of about 0.9 mm (SiC-A) and 1 mm (SiC-B) were extracted from surrogate nuclear fuels and tested using the two test methods. Mean fracture stresses of 239, 263, and 283 MPa were measured for SiC-A and SiC-B by internal pressurization, and SiC-A by diametrical loading, respectively. In addition, size effects in the fracture stress were investigated using tubular alumina specimens with various sizes. A significant size effect was found in the experimental data and was also predicted by the effective area-based scaling method.

Original languageEnglish
Pages (from-to)653-658
Number of pages6
JournalJournal of Nuclear Materials
Volume367-370 A
Issue numberSPEC. ISS.
DOIs
StatePublished - Aug 1 2007

Funding

This research was sponsored by the US Department of Energy under Contract DE-AC05-00OR22725 with UT-Battelle, LLC through a Nuclear Energy Research Initiative Grant.

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