Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphites

James B. Spicer; Fan W. Zeng; Nidia C. Gallego; Cristian I. Contescu

doi:10.1109/ULTSYM.2017.8092979

Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphites

James B. Spicer, Fan W. Zeng, Nidia C. Gallego, Cristian I. Contescu

Nanomaterials Chemistry Group

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Structure-property relationships in bulk materials can be important in establishing sensing methods to assess the state of material microstructure. This is particularly true for nuclear graphites since these materials can display anisotropy and can become oxidized under service conditions. Both anisotropy and oxidation-induced porosity can influence structural integrity and this must be confirmed during the lifetime of the material. In this work, laser ultrasonic methods were used to measure the elastic response of various graphite grades with a focus on NBG-18, NBG-25 and IG-110. Results of laser ultrasonic measurements in oxidized graphites show that the moduli decrease with increasing porosity. This variation can be interpreted successfully using effective medium models if the characteristics of graphite porosity are taken into account. Results of laser ultrasonic shear wave birefringence measurements can be used to assess elastic anisotropy. This anisotropy can be expressed in terms of the orientation distribution coefficients W₄₀₀ and W₂₀₀. Interpretation of results requires the use of appropriate property-averaging schemes.

Original language	English
Title of host publication	2017 IEEE International Ultrasonics Symposium, IUS 2017
Publisher	IEEE Computer Society
ISBN (Electronic)	9781538633830
DOIs	https://doi.org/10.1109/ULTSYM.2017.8092979
State	Published - Oct 31 2017
Event	2017 IEEE International Ultrasonics Symposium, IUS 2017 - Washington, United States Duration: Sep 6 2017 → Sep 9 2017

Publication series

Name	IEEE International Ultrasonics Symposium, IUS
ISSN (Print)	1948-5719
ISSN (Electronic)	1948-5727

Conference

Conference	2017 IEEE International Ultrasonics Symposium, IUS 2017
Country/Territory	United States
City	Washington
Period	09/6/17 → 09/9/17

Funding

The authors gratefully acknowledge support from the U.S. Department of Energy (DOE) through the Nuclear Energy University Program (NEUP) Contract No. 00118687. Research at ORNL was performed collaboratively under the DOE Work for Others (WFO) Program.

Keywords

Characterization technique
Elastic modulus
Material property
Porosity
Ultrasonics

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10.1109/ULTSYM.2017.8092979

Cite this

Spicer, J. B., Zeng, F. W., Gallego, N. C., & Contescu, C. I. (2017). Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphites. In 2017 IEEE International Ultrasonics Symposium, IUS 2017 Article 8092979 (IEEE International Ultrasonics Symposium, IUS). IEEE Computer Society. https://doi.org/10.1109/ULTSYM.2017.8092979

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title = "Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphites",

abstract = "Structure-property relationships in bulk materials can be important in establishing sensing methods to assess the state of material microstructure. This is particularly true for nuclear graphites since these materials can display anisotropy and can become oxidized under service conditions. Both anisotropy and oxidation-induced porosity can influence structural integrity and this must be confirmed during the lifetime of the material. In this work, laser ultrasonic methods were used to measure the elastic response of various graphite grades with a focus on NBG-18, NBG-25 and IG-110. Results of laser ultrasonic measurements in oxidized graphites show that the moduli decrease with increasing porosity. This variation can be interpreted successfully using effective medium models if the characteristics of graphite porosity are taken into account. Results of laser ultrasonic shear wave birefringence measurements can be used to assess elastic anisotropy. This anisotropy can be expressed in terms of the orientation distribution coefficients W400 and W200. Interpretation of results requires the use of appropriate property-averaging schemes.",

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Spicer, JB, Zeng, FW, Gallego, NC & Contescu, CI 2017, Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphites. in 2017 IEEE International Ultrasonics Symposium, IUS 2017., 8092979, IEEE International Ultrasonics Symposium, IUS, IEEE Computer Society, 2017 IEEE International Ultrasonics Symposium, IUS 2017, Washington, United States, 09/6/17. https://doi.org/10.1109/ULTSYM.2017.8092979

Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphites. / Spicer, James B.; Zeng, Fan W.; Gallego, Nidia C. et al.
2017 IEEE International Ultrasonics Symposium, IUS 2017. IEEE Computer Society, 2017. 8092979 (IEEE International Ultrasonics Symposium, IUS).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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N2 - Structure-property relationships in bulk materials can be important in establishing sensing methods to assess the state of material microstructure. This is particularly true for nuclear graphites since these materials can display anisotropy and can become oxidized under service conditions. Both anisotropy and oxidation-induced porosity can influence structural integrity and this must be confirmed during the lifetime of the material. In this work, laser ultrasonic methods were used to measure the elastic response of various graphite grades with a focus on NBG-18, NBG-25 and IG-110. Results of laser ultrasonic measurements in oxidized graphites show that the moduli decrease with increasing porosity. This variation can be interpreted successfully using effective medium models if the characteristics of graphite porosity are taken into account. Results of laser ultrasonic shear wave birefringence measurements can be used to assess elastic anisotropy. This anisotropy can be expressed in terms of the orientation distribution coefficients W400 and W200. Interpretation of results requires the use of appropriate property-averaging schemes.

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Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphites

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