Proposal for ultrasonic technique for evaluation elastic constants in UO2 pellets
Palavras-chave:
uranium dioxide, ultrasound, ultrasonic wave, elastic constants, aluminaResumo
This work aims to develop and propose an ultrasonic technique to evaluate the elastic constants of UO2 pellets. However, because of the difficulties in handling nuclear material, we proposed an initial study using alumina (Al2O3). Alumina pellets are also ceramic material and their porosity and dimensions are in the similar range of UO2 pellets. They also are used as thermal insulation in the fuel rods, operating under the same conditions. They were fabricated and used in two different sets of 10 Al2O3 pellets with densities of 92% and 96%. The developed ultrasonic technique evaluates the traveling time of ultrasonic waves, longitudinal and transverse, and correlates the observed time and the elastic constants of the materials. Equations relating the speed of the ultrasonic wave to the elastic modulus, shear modulus and Poisson's ratio have led to these elastic constants, with graphics of correlation that showed excellent agreement with the available literature for Al2O3. According to the results and considering the ease of implementation of this technique, we believe that it should be applied for UO2 pellets, justifying further studies for that application.
This Work was presented in INAC - 2015
Referências
YOSHIMURA, H. N. et. al. Efeito da porosidade nas propriedades mecânicas de uma alumina de elevada pureza. Associação Brasileira de Cerâmica, São Paulo, v. 51, [s.n], p. 239-251,2005.
GITZEN, W. H. Alumina as a Ceramic Material. 4 ed. Ohio: 0The American Ceramic Society, 1964. 46 p.
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Copyright (c) 2018 Alessandra S.V.R. Lopes, Douglas B. Baroni, Marcelo S. Q. Bittencourt, Mauro C. L. Souza
Este trabalho está licenciado sob uma licença Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.