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Title: Fractography and the Surface Crack in Flexure (SCF) method for evaluating fracture toughness of ceramics

Abstract

The surface crack in flexure (SCF) method, also known as the controlled surface flaw method, has been used to measure fracture toughness of ceramics and glasses for almost 20 years. New fracture toughness results for a range of ceramics and glasses including alumina, boron carbide, silicon carbide, silicon nitride, titanium diboride, zirconia, glass ceramic, borosilicate crown glass, and a whisker-reinforced alumina are presented in this paper. Some materials are conducive to precrack measurements, while others are not. New techniques for detecting the precracks are presented. A surprising outcome from a recently concluded Versailles Advanced Materials and Standards (VAMAS) round robin project was that the computed toughness is often not sensitive to the exact precrack size measurement. Consistent results were obtained by many laboratories despite different viewing modes and magnifications. The reasons for this consistency and why toughness is insensitive to precrack size is presented.

Authors:
;  [1];  [2]
  1. National Institute of Standards Technology, Gaithersburg, MD (United States)
  2. Swiss Federal Laboratories for Materials Testing and Research, Dubendorf (Switzerland)
Publication Date:
OSTI Identifier:
535632
Report Number(s):
CONF-950739-
TRN: 97:003392-0003
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Conference
Resource Relation:
Conference: 3. Alfred conference on fractography of glasses and ceramics, Alfred, NY (United States), 9-12 Jul 1995; Other Information: PBD: 1996; Related Information: Is Part Of Ceramic transactions: Fractography of glasses and ceramics III. Volume 64; Varner, J.R.; Frechette, V.D.; Quinn, G.D. [eds.]; PB: 556 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; FRACTURE PROPERTIES; BORON CARBIDES; SILICON CARBIDES; SILICON NITRIDES; TITANIUM BORIDES; ZIRCONIUM OXIDES; CERAMICS; FRACTOGRAPHY; CRACKS

Citation Formats

Quinn, G D, Gettings, R J, and Kuebler, J J. Fractography and the Surface Crack in Flexure (SCF) method for evaluating fracture toughness of ceramics. United States: N. p., 1996. Web.
Quinn, G D, Gettings, R J, & Kuebler, J J. Fractography and the Surface Crack in Flexure (SCF) method for evaluating fracture toughness of ceramics. United States.
Quinn, G D, Gettings, R J, and Kuebler, J J. 1996. "Fractography and the Surface Crack in Flexure (SCF) method for evaluating fracture toughness of ceramics". United States.
@article{osti_535632,
title = {Fractography and the Surface Crack in Flexure (SCF) method for evaluating fracture toughness of ceramics},
author = {Quinn, G D and Gettings, R J and Kuebler, J J},
abstractNote = {The surface crack in flexure (SCF) method, also known as the controlled surface flaw method, has been used to measure fracture toughness of ceramics and glasses for almost 20 years. New fracture toughness results for a range of ceramics and glasses including alumina, boron carbide, silicon carbide, silicon nitride, titanium diboride, zirconia, glass ceramic, borosilicate crown glass, and a whisker-reinforced alumina are presented in this paper. Some materials are conducive to precrack measurements, while others are not. New techniques for detecting the precracks are presented. A surprising outcome from a recently concluded Versailles Advanced Materials and Standards (VAMAS) round robin project was that the computed toughness is often not sensitive to the exact precrack size measurement. Consistent results were obtained by many laboratories despite different viewing modes and magnifications. The reasons for this consistency and why toughness is insensitive to precrack size is presented.},
doi = {},
url = {https://www.osti.gov/biblio/535632}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {12}
}

Conference:
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