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Title: Vickers microindentation toughness of a sintered SiC in the median-crack regime

Abstract

The Vickers microindentation method for the determination of the fracture toughness of ceramics was investigated in the median crack regime for a sintered alpha SiC. The results are compared with fracture toughness measurements by conventional fracture mechanics technique and also with the reported indentation toughness for the low-load Palmqvist crack regime. Indentation toughnesses in the median crack regime vary widely depending on the choice of the specific equation which is applied. The indentation toughnesses are also load (crack length) dependent. A decreasing R-curve trend results, in contradiction to the flat R-curve that has been observed with conventional fracture mechanics techniques. It is concluded that the Vickers microindentation method is not a reliable technique for the determination of the fracture toughness of ceramics in the median crack regime.

Authors:
;  [1];  [2];  [3];  [4]
  1. Washington Univ., Seattle, WA (United States). Coll. of Engineering
  2. Argonne National Lab., IL (United States)
  3. Pacific Northwest Lab., Richland, WA (United States)
  4. Nevada Univ., Reno, NV (United States). Mackay School of Mines
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
5239751
Report Number(s):
PNL-SA-16927
ON: DE92000225
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; SILICON CARBIDES; FRACTURE PROPERTIES; HARDNESS; CRACK PROPAGATION; CRACKS; MATERIALS TESTING; CARBIDES; CARBON COMPOUNDS; MECHANICAL PROPERTIES; SILICON COMPOUNDS; TESTING; 360203* - Ceramics, Cermets, & Refractories- Mechanical Properties; 420500 - Engineering- Materials Testing

Citation Formats

Ghosh, Asish, Kobayashi, A S, Li, Zhuang, Henager, Jr, C H, and Bradt, R C. Vickers microindentation toughness of a sintered SiC in the median-crack regime. United States: N. p., 1991. Web. doi:10.2172/5239751.
Ghosh, Asish, Kobayashi, A S, Li, Zhuang, Henager, Jr, C H, & Bradt, R C. Vickers microindentation toughness of a sintered SiC in the median-crack regime. United States. https://doi.org/10.2172/5239751
Ghosh, Asish, Kobayashi, A S, Li, Zhuang, Henager, Jr, C H, and Bradt, R C. 1991. "Vickers microindentation toughness of a sintered SiC in the median-crack regime". United States. https://doi.org/10.2172/5239751. https://www.osti.gov/servlets/purl/5239751.
@article{osti_5239751,
title = {Vickers microindentation toughness of a sintered SiC in the median-crack regime},
author = {Ghosh, Asish and Kobayashi, A S and Li, Zhuang and Henager, Jr, C H and Bradt, R C},
abstractNote = {The Vickers microindentation method for the determination of the fracture toughness of ceramics was investigated in the median crack regime for a sintered alpha SiC. The results are compared with fracture toughness measurements by conventional fracture mechanics technique and also with the reported indentation toughness for the low-load Palmqvist crack regime. Indentation toughnesses in the median crack regime vary widely depending on the choice of the specific equation which is applied. The indentation toughnesses are also load (crack length) dependent. A decreasing R-curve trend results, in contradiction to the flat R-curve that has been observed with conventional fracture mechanics techniques. It is concluded that the Vickers microindentation method is not a reliable technique for the determination of the fracture toughness of ceramics in the median crack regime.},
doi = {10.2172/5239751},
url = {https://www.osti.gov/biblio/5239751}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}