|
|
|
|
 VAMAS TWA #3 Project #1: Slow Crack Growth Parameters Round Robin Dynamic Fatigue Objective Determine whether different laboratories can measure consistent values of the slow crack growth exponent, N. Approach Vary stressing rate during flexural strength testing at room temperature. Use both artificially and naturally flawed specimens. Several thousand specimens from 2 aluminas furnished by Desmarquest, France. Outcome Round Robin completed, 1988. 16 of 20 labs contributed. Principal Findings Important technical guidelines were developed. A minimum range of 3 orders of magnitude stressing rate is essential. This project prompted NPL to sponsor and organize a follow-on, UK only, round robin. Results published in Dec. 1990: W. Byrne and R. Morrell, "Results of the UK Interlaboratory Strength Test Exercise," NPL report DMM (D) 72. Standards Impact A CEN standard was prepared based on the findings of the two studies: ENV 843-4 Advanced Technical Ceramics - Monolithic Ceramics - Mechanical Properties at Room Temperature; Part 3: Determination of Subcritical Crack Growth Parameters from Constant Stressing Rate Flexural Strength Tests. Publications No final report. Results presented by Dr. S. Freiman at the 7th CIMTEC World Ceramics Congress, Montecatini Terme, Italy, June 23, 1990., "Pre-Standardization and Standardization Activities in the USA on Mechanical Property Testing of Advanced Structural Ceramics", Preliminary results published in VAMAS bulletin #8. |
Privacy Statement/Security Notice
Disclaimer | FOIA
NIST is an agency of the
U.S. Commerce Department
Date created: 08 February 2001
Last updated: 03 November 2006
Technical inquiries:
Ceramics Division
NIST, 100 Bureau Drive, Stop 8520, Gaithersburg, MD 20899-8520.
Phone (301) 975-6119
Fax (301) 975-5334
Ceramics website comments:
Ceramics Webmaster
General NIST inquiries:
Public Inquiries Unit:
Phone (301) 975-NIST (6478)
TTY (301) 975-8295