Fracture Toughness of Advanced Structural Ceramics: Applying ASTM C1421
Abstract
The three methods of determining the quasi-static Mode I fracture toughness (KIc) (surface crack in flexure – SC, single-edge precracked beam – PB, and chevron notched beam – VB) found in ASTM C1421 were applied to a variety of advanced ceramic materials. All three methods produced valid and comparable KIc values for the Al2O3, SiC, Si3N4 and SiAlON ceramics examined. However, not all methods could successfully be applied to B4C, ZrO2 and WC ceramics due to a variety of material factors. The coarse-grained microstructure of one B4C hindered the ability to observe and measure the precracks generated in the SC and PB methods while the transformation toughening in the ZrO2 prevented the formation of the SC and PB precracks and thus made it impossible to use either method on this ceramic. The high strength and elastic modulus of the WC made it impossible to achieve stable crack growth using the VB method because the specimen stored a tremendous amount of energy prior to fracture. Even though these methods have passed the rigors of the standardization process there are still some issues to be resolved when the methods are applied to certain classes of ceramics. We recommend that at least twomore »
- Authors:
-
- Army Research Lab., Aberdeen, MD (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE; US Army Research Laboratory (USARL); Work for Others (WFO)
- OSTI Identifier:
- 1286775
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Ceramic Society
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 2; Journal ID: ISSN 0002-7820
- Publisher:
- American Ceramic Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Swab, Jeffrey J., Tice, Jason, Wereszczak, Andrew A., and Kraft, Reuben H. Fracture Toughness of Advanced Structural Ceramics: Applying ASTM C1421. United States: N. p., 2014.
Web. doi:10.1111/jace.13293.
Swab, Jeffrey J., Tice, Jason, Wereszczak, Andrew A., & Kraft, Reuben H. Fracture Toughness of Advanced Structural Ceramics: Applying ASTM C1421. United States. https://doi.org/10.1111/jace.13293
Swab, Jeffrey J., Tice, Jason, Wereszczak, Andrew A., and Kraft, Reuben H. Mon .
"Fracture Toughness of Advanced Structural Ceramics: Applying ASTM C1421". United States. https://doi.org/10.1111/jace.13293. https://www.osti.gov/servlets/purl/1286775.
@article{osti_1286775,
title = {Fracture Toughness of Advanced Structural Ceramics: Applying ASTM C1421},
author = {Swab, Jeffrey J. and Tice, Jason and Wereszczak, Andrew A. and Kraft, Reuben H.},
abstractNote = {The three methods of determining the quasi-static Mode I fracture toughness (KIc) (surface crack in flexure – SC, single-edge precracked beam – PB, and chevron notched beam – VB) found in ASTM C1421 were applied to a variety of advanced ceramic materials. All three methods produced valid and comparable KIc values for the Al2O3, SiC, Si3N4 and SiAlON ceramics examined. However, not all methods could successfully be applied to B4C, ZrO2 and WC ceramics due to a variety of material factors. The coarse-grained microstructure of one B4C hindered the ability to observe and measure the precracks generated in the SC and PB methods while the transformation toughening in the ZrO2 prevented the formation of the SC and PB precracks and thus made it impossible to use either method on this ceramic. The high strength and elastic modulus of the WC made it impossible to achieve stable crack growth using the VB method because the specimen stored a tremendous amount of energy prior to fracture. Even though these methods have passed the rigors of the standardization process there are still some issues to be resolved when the methods are applied to certain classes of ceramics. We recommend that at least two of these methods be employed to determine the KIc, especially when a new or unfamiliar ceramic is being evaluated.},
doi = {10.1111/jace.13293},
journal = {Journal of the American Ceramic Society},
number = 2,
volume = 98,
place = {United States},
year = {Mon Nov 03 00:00:00 EST 2014},
month = {Mon Nov 03 00:00:00 EST 2014}
}
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