Abstract
Effect of oxidation on the tension-tension fatigue strength was examined for a fine-grained isotropic nuclear graphite Grade IG-110. Specimens were oxidized in air at 500°C to a burnoff level of 3.5 and 7.0%. Fatigue tests were carried out at room temperature at a frequency between 0.5 and 10Hz. The conclusions are:(1) On the basis of all the data points both for the oxidized specimens and the unoxidized, the following relationship was obtained between applied stress σa and number of cycles to fracture Nf:log[(σa/σt0)(σ0/σ)6.24]=-0.00831-0.00988 log Nf, where σt0, ρ0 and ρ are the mean of the tensile strength of unoxidized specimens, bulk densities before and after oxidation, respectively.(2) Combination of the fatigue strength curve for the unoxidized and the data on the tensile strength loss due to oxidation made it possible to estimate the fatigue strength of the oxidized with 99% survival probability 95% confidence, which was found to be close to the value calculated from the results of the fatigue test on the oxidized specimens.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Atomic Energy Society of Japan / Atomic Energy Society of Japan
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
