skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphite

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.

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [2]
  1. Johns Hopkins University
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1399531
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 2017 IEEE International Ultrasonics Symposium (IUS) - Washington, District of Columbia, United States of America - 9/5/2017 8:00:00 AM-9/9/2017 8:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Zeng, Fan W., Spicer, James B., Gallego, Nidia C., and Contescu, Cristian I. Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphite. United States: N. p., 2017. Web.
Zeng, Fan W., Spicer, James B., Gallego, Nidia C., & Contescu, Cristian I. Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphite. United States.
Zeng, Fan W., Spicer, James B., Gallego, Nidia C., and Contescu, Cristian I. Fri . "Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphite". United States. https://www.osti.gov/servlets/purl/1399531.
@article{osti_1399531,
title = {Laser ultrasonic assessment of the effects of oxidation and microcracking on the elastic moduli of nuclear graphite},
author = {Zeng, Fan W. and Spicer, James B. and Gallego, Nidia C. and Contescu, Cristian I.},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/1399531}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {9}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: