U.S. Department of EnergyOffice of Scientific and Technical Information
Swelling and Time-Dependent Crack Growth in SiC/SiC Composites
Abstract
SiC continuous-fiber composites are considered for nuclear applications but concern has centered on the differential materials response of the fiber, fiber/matrix interphase (fiber coating), and matrix. In our study, a continuous-fiber composite is simulated by four concentric cylinders to explore the magnitude of radial stresses when irradiation swelling of the various components is incorporated. The outputs of this model were input into a time-dependent crack-bridging model to predict crack growth rates in an environment where thermal and irradiation creep of SiC-based fibers is considered. Under assumed Coulomb friction the fiber-matrix sliding stress decreases with increasing dose and then increases once the pyrocarbon swelling reaches “turn around.” This causes an initial increase in crack growth rate and higher stresses in crack bridging fibers at higher doses. An assumed irradiation creep law for fine-grained SiC fibers is shown to dominate the radiation response, however.
- Authors:
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 989459
- Report Number(s):
- PNNL-SA-47686
AT6020100
- DOE Contract Number:
- AC05-76RL01830
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Nuclear Materials, 367-370, Part 1:742-747
- Additional Journal Information:
- Journal Name: Journal of Nuclear Materials, 367-370, Part 1:742-747
- Country of Publication:
- United States
- Language:
- English
- Subject:
- SiC composites; theory and modeling; fusion energy; swelling; mechanical properties
Citation Formats
Henager, Charles H. Swelling and Time-Dependent Crack Growth in SiC/SiC Composites. United States: N. p., 2007.
Web. doi:10.1016/j.jnucmat.2007.03.088.
Henager, Charles H. Swelling and Time-Dependent Crack Growth in SiC/SiC Composites. United States. https://doi.org/10.1016/j.jnucmat.2007.03.088
Henager, Charles H. 2007.
"Swelling and Time-Dependent Crack Growth in SiC/SiC Composites". United States. https://doi.org/10.1016/j.jnucmat.2007.03.088.
@article{osti_989459,
title = {Swelling and Time-Dependent Crack Growth in SiC/SiC Composites},
author = {Henager, Charles H},
abstractNote = {SiC continuous-fiber composites are considered for nuclear applications but concern has centered on the differential materials response of the fiber, fiber/matrix interphase (fiber coating), and matrix. In our study, a continuous-fiber composite is simulated by four concentric cylinders to explore the magnitude of radial stresses when irradiation swelling of the various components is incorporated. The outputs of this model were input into a time-dependent crack-bridging model to predict crack growth rates in an environment where thermal and irradiation creep of SiC-based fibers is considered. Under assumed Coulomb friction the fiber-matrix sliding stress decreases with increasing dose and then increases once the pyrocarbon swelling reaches “turn around.” This causes an initial increase in crack growth rate and higher stresses in crack bridging fibers at higher doses. An assumed irradiation creep law for fine-grained SiC fibers is shown to dominate the radiation response, however.},
doi = {10.1016/j.jnucmat.2007.03.088},
url = {https://www.osti.gov/biblio/989459},
journal = {Journal of Nuclear Materials, 367-370, Part 1:742-747},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 01 00:00:00 EDT 2007},
month = {Wed Aug 01 00:00:00 EDT 2007}
}
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