Graduate Thesis Or Dissertation
 

Direct shear testing of UO₂ sphere-pac nuclear reactor fuel

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  • The design, development, and utilization of a direct shear test apparatus is presented in this thesis. The effectiveness of the device for determining the friction angle stress state parameter is studied. Two materials, alumina and uranium dioxide, were tested. Alumina microspheres were employed in the initial experiments to simulate the behavior of the sphere-pac material. The results of the initial tests justified the use of the mechanism to study the shear strength of uranium dioxide microspheres. Experimental results for the alumina were compared with independent test results and found to be comparable for a similar method of data reduction. However, a preferred method of data reduction is presented which shows a more conservative friction angle value for extrapolation purposes. The experimental results for uranium dioxide are presented and confirmed the adaptability of the direct shear device for friction angle determination.
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