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VAMAS TWA #3
Project #3: Room Temperature Fracture Toughness Round Robin ('89 RRT)
Fracture Toughness I
Organized by the Japan Fine Ceramic Center, (Drs. Awaji, Kon, and Okuda).

Objective

Evaluate 3 Test Methods:
Single-Edged Precracked Beam (SEPB) (bridge- prcracked flexure specimen)
Indentation Strength (IS), (Vickers indent and break a flexure specimen)
Indentation Fracture (IF) (Vickers indentation crack length).

Approach

Use two materials: silicon nitride, EC 141 and a fine grained zirconia-alumina composite (ZAC). All testing at room temperature.

Outcome

Completed in 1992, 18 of 23 labs responded.

Principal Findings

Results were mixed: SEPB and IS results were consistent, IF results were not. The IS method results had a dependence on indentation load. R-curve or slow crack growth may have affected the ZAC SEPB data. Topics for further study were identified.

Standards Impact

This round robin has had a significant influence ASTM standard PS 070-97 (Committee C-28, Advanced Ceramics) in the United States and in Europe (Committee CEN TC 184 and ESIS, the European Structural Integrity Society).

Japan previously had standardized two of the methods (SEPB and IF) in JIS R 1607-1990.

An ISO standard is under development in ISO TC 206, Fine Ceramics.

Publications
  1. Awaji, H., Kon, J., and Okuda, H., "The VAMAS Fracture Toughness Test Round-Robin on Ceramics," VAMAS Report #9, Dec. 1990,. (Avail. Japan Fine Ceramics Center)
    2. >
  2. Awaji, H., Yamada, T., and Okuda, H., "Results of the Fracture Toughness Test Round Robin on Ceramics, VAMAS Project," Journal of the Japanese Ceramic Society, 99 [5] (1991) pp. 417- 422. also Journal of the Ceramic Society of Japan, Int. Edition, 99 pp. 403-408.
  3. Awaji, H., Yamada, T., Okuda, H., Tanaka, H., Nagai, S. Wakai, F., and Sakaguchi, S., "Results of the Fracture Toughness Test Round Robin on Ceramics," Proceedings of the International Symposium on Pre-standards Research for Advanced Materials," Tokyo, Japan, Dec. 16-18, 1991.
  4. G. Quinn, J. Salem, I. Bar-on, K. Chu, M. Foley, and H. Fang, "Fracture Toughness of Advanced Ceramics at Room Temperature," J. of Res. of. N.I.S.T., 97 [5], Sept.-Oct. 1992, pp. 579-607.
  5. G. Quinn, "Fracture Toughness of Advanced Ceramics at Room Temperature: A VAMAS Round Robin," Ceram. Eng. and Sci. Proc., Vol. 14, #7-8, 1993, pp 92-100.
  6. H. Awaji, M. Mizuno, T. Yamada, and H. Okuda, "VAMAS Fracture Toughness Round Robin Test on Ceramics," pp. 161-16 in Proceedings of the 34th Japan Congress on Materials Research, the Socitey of Materials Science, Japan, 1991.
For more information or copies of the reports, contact:
Dr. Mineo Mizuno, Japan Fine Ceramics Center, 2-4-1 Mutsuno Atsuka-ku, Nagoya, Aichi-ken 456, JAPAN, Tel: +81 (52) 871 3500 email: mizuno@jfcc.or.jp
or
Mr. George Quinn, NIST Ceramics Division, Gaithersburg, MD 20899, USA, Tel: (+001) 301 975 5765 email: geoq@nist.gov


The VAMAS TWA #3 Round Robins Between 1987 and 1999.

Click on the numbered projects in the image below for round robin details.



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