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Title: Modeling the effects of oxidation-induced porosity on the elastic moduli of nuclear graphites

Abstract

Oxidation of nuclear graphites produces microstructural changes that affect the elastic moduli of these materials. It is widely accepted that the primary effect of oxidation is to increase porosity, but the related effect on the moduli cannot be explained satisfactorily by simply noting changes to porosity. In this work, models describing the elastic moduli of porous, polycrystalline graphite materials are developed to interpret experimental determinations of Young's modulus and shear modulus in two grades of nuclear graphite – IG-110 and NBG-18 – that were oxidized to produce varying levels of porosity. Experimental measurements were carried out using laser-based ultrasonic methods and were interpreted successfully using models that take into account the effects of preferential oxidation of different elements of the graphite microstructure. The results indicate the importance of the processes that lead to increased porosity since these can heavily influence the nature of the resulting structure-property relationships.

Authors:
 [1];  [1]; ORCiD logo [1];  [2]; ORCiD logo [2]
  1. Johns Hopkins Univ., Baltimore, MD (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1495988
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Carbon
Additional Journal Information:
Journal Volume: 141; Journal Issue: C; Journal ID: ISSN 0008-6223
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Olasov, Lauren R., Zeng, Fan W., Spicer, James B., Gallego, Nidia C., and Contescu, Cristian I. Modeling the effects of oxidation-induced porosity on the elastic moduli of nuclear graphites. United States: N. p., 2018. Web. doi:10.1016/j.carbon.2018.09.051.
Olasov, Lauren R., Zeng, Fan W., Spicer, James B., Gallego, Nidia C., & Contescu, Cristian I. Modeling the effects of oxidation-induced porosity on the elastic moduli of nuclear graphites. United States. doi:10.1016/j.carbon.2018.09.051.
Olasov, Lauren R., Zeng, Fan W., Spicer, James B., Gallego, Nidia C., and Contescu, Cristian I. Mon . "Modeling the effects of oxidation-induced porosity on the elastic moduli of nuclear graphites". United States. doi:10.1016/j.carbon.2018.09.051. https://www.osti.gov/servlets/purl/1495988.
@article{osti_1495988,
title = {Modeling the effects of oxidation-induced porosity on the elastic moduli of nuclear graphites},
author = {Olasov, Lauren R. and Zeng, Fan W. and Spicer, James B. and Gallego, Nidia C. and Contescu, Cristian I.},
abstractNote = {Oxidation of nuclear graphites produces microstructural changes that affect the elastic moduli of these materials. It is widely accepted that the primary effect of oxidation is to increase porosity, but the related effect on the moduli cannot be explained satisfactorily by simply noting changes to porosity. In this work, models describing the elastic moduli of porous, polycrystalline graphite materials are developed to interpret experimental determinations of Young's modulus and shear modulus in two grades of nuclear graphite – IG-110 and NBG-18 – that were oxidized to produce varying levels of porosity. Experimental measurements were carried out using laser-based ultrasonic methods and were interpreted successfully using models that take into account the effects of preferential oxidation of different elements of the graphite microstructure. The results indicate the importance of the processes that lead to increased porosity since these can heavily influence the nature of the resulting structure-property relationships.},
doi = {10.1016/j.carbon.2018.09.051},
journal = {Carbon},
number = C,
volume = 141,
place = {United States},
year = {2018},
month = {9}
}

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