Theory and application of laser ultrasonic shear wave birefringence measurements to the determination of microstructure orientation in transversely isotropic, polycrystalline graphite materials
Abstract
Laser ultrasonic line source methods have been used to study elastic anisotropy in nuclear graphites by measuring shear wave birefringence. Depending on the manufacturing processes used during production, nuclear graphites can exhibit various degrees of material anisotropy related to preferred crystallite orientation and to microcracking. In this paper, laser ultrasonic line source measurements of shear wave birefringence on NBG-25 have been performed to assess elastic anisotropy. Laser line sources allow specific polarizations for shear waves to be transmitted – the corresponding wavespeeds can be used to compute bulk, elastic moduli that serve to quantify anisotropy. These modulus values can be interpreted using physical property models based on orientation distribution coefficients and microcrack-modified, single crystal moduli to represent the combined effects of crystallite orientation and microcracking on material anisotropy. Finally, ultrasonic results are compared to and contrasted with measurements of anisotropy based on the coefficient of thermal expansion to show the relationship of results from these techniques.
- Authors:
-
- Johns Hopkins Univ., Baltimore, MD (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Johns Hopkins Univ., Baltimore, MD (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Nuclear Reactor Technologies (NE-7). Nuclear Energy University Program (NEUP); USDOE
- OSTI Identifier:
- 1394406
- Alternate Identifier(s):
- OSTI ID: 1488970
- Grant/Contract Number:
- AC05-00OR22725; 00118687
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Carbon
- Additional Journal Information:
- Journal Volume: 115; Journal ID: ISSN 0008-6223
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Zeng, Fan W., Contescu, Cristian I., Gallego, Nidia C., and Spicer, James B. Theory and application of laser ultrasonic shear wave birefringence measurements to the determination of microstructure orientation in transversely isotropic, polycrystalline graphite materials. United States: N. p., 2016.
Web. doi:10.1016/j.carbon.2016.12.042.
Zeng, Fan W., Contescu, Cristian I., Gallego, Nidia C., & Spicer, James B. Theory and application of laser ultrasonic shear wave birefringence measurements to the determination of microstructure orientation in transversely isotropic, polycrystalline graphite materials. United States. https://doi.org/10.1016/j.carbon.2016.12.042
Zeng, Fan W., Contescu, Cristian I., Gallego, Nidia C., and Spicer, James B. 2016.
"Theory and application of laser ultrasonic shear wave birefringence measurements to the determination of microstructure orientation in transversely isotropic, polycrystalline graphite materials". United States. https://doi.org/10.1016/j.carbon.2016.12.042. https://www.osti.gov/servlets/purl/1394406.
@article{osti_1394406,
title = {Theory and application of laser ultrasonic shear wave birefringence measurements to the determination of microstructure orientation in transversely isotropic, polycrystalline graphite materials},
author = {Zeng, Fan W. and Contescu, Cristian I. and Gallego, Nidia C. and Spicer, James B.},
abstractNote = {Laser ultrasonic line source methods have been used to study elastic anisotropy in nuclear graphites by measuring shear wave birefringence. Depending on the manufacturing processes used during production, nuclear graphites can exhibit various degrees of material anisotropy related to preferred crystallite orientation and to microcracking. In this paper, laser ultrasonic line source measurements of shear wave birefringence on NBG-25 have been performed to assess elastic anisotropy. Laser line sources allow specific polarizations for shear waves to be transmitted – the corresponding wavespeeds can be used to compute bulk, elastic moduli that serve to quantify anisotropy. These modulus values can be interpreted using physical property models based on orientation distribution coefficients and microcrack-modified, single crystal moduli to represent the combined effects of crystallite orientation and microcracking on material anisotropy. Finally, ultrasonic results are compared to and contrasted with measurements of anisotropy based on the coefficient of thermal expansion to show the relationship of results from these techniques.},
doi = {10.1016/j.carbon.2016.12.042},
url = {https://www.osti.gov/biblio/1394406},
journal = {Carbon},
issn = {0008-6223},
number = ,
volume = 115,
place = {United States},
year = {Sun Dec 18 00:00:00 EST 2016},
month = {Sun Dec 18 00:00:00 EST 2016}
}
Web of Science