Failure Analysis of Dispersion Fuel Elements Based on Matrix Cracking

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A mathematical model has been developed for estimati the burnup at which mechanical failure occurs in dispersion fuel elements. It is postulated that failure at low temperature, < 900 deg F, occurs as a result of brittle fracture of an elastic matrix when the intensity of the stress locally reaches the ultimate strength of the material. The contributions of fission gas pressure and thermal stress are incorporated in the stress analysis. Because of the complexity of the stress distribution and the failure process, it was necessary to make stringent assumptions in order to have a workable model. Within the framework … continued below

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45 pages

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Beck, S. D. December 28, 1961.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 22 times. More information about this report can be viewed below.

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  • Alco Products (Firm)
    Publisher Info: Alco Products, inc., Schenectady, N.Y.
    Place of Publication: Schenectady, New York

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Description

A mathematical model has been developed for estimati the burnup at which mechanical failure occurs in dispersion fuel elements. It is postulated that failure at low temperature, < 900 deg F, occurs as a result of brittle fracture of an elastic matrix when the intensity of the stress locally reaches the ultimate strength of the material. The contributions of fission gas pressure and thermal stress are incorporated in the stress analysis. Because of the complexity of the stress distribution and the failure process, it was necessary to make stringent assumptions in order to have a workable model. Within the framework of the postulates, burnups to failure are predicted for several values of certain important parameters and compared with burnups to failure obtained from a plastic yield model for failure developed by previous investigation. The two models give good agreement for the special cases considered. Of the parameters examined, relative density of the fuel particles has the greatest influence on predictions of allowable burnup. The thermal stress and volume fraction of fuel play minor roles. (auth)

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45 pages

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  • Other Information: Orig. Receipt Date: 31-DEC-62

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Office of Scientific & Technical Information Technical Reports

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  • December 28, 1961

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 13, 2021, 1:45 a.m.

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Beck, S. D. Failure Analysis of Dispersion Fuel Elements Based on Matrix Cracking, report, December 28, 1961; Schenectady, New York. (https://digital.library.unt.edu/ark:/67531/metadc1057892/: accessed September 20, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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