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Proceedings Paper

Measuring the stability of three copper alloys
Author(s): Theodore D. Doiron; John R. Stoup; Patricia Snoots; Grace Chaconas
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Paper Abstract

In this paper we report measurements of the dimensional stability of samples of brass, beryllium copper, and tellurium copper taken over an 18 month time span. Of the materials, brass was the most stable, decreasing slightly in length at the rate of 1 part per million per year (ppm/y) with an uncertainty (3a) of about 1 ppm/y. Tellurium copper shrank at an average rate of 2.Li ppm/y and beryllium copper, the least stable, at the rate of 5.8 ppm/y. To measure the instrumental uncertainty 4 samples of each material were measured, and the measurement scheme was designed to detect and correct for thermal drift ,during measurements. The experiment design problems associated with these measurements and the associated uncertainties are discussed.

Paper Details

Date Published: 1 November 1990
PDF: 8 pages
Proc. SPIE 1335, Dimensional Stability, (1 November 1990); doi: 10.1117/12.22862
Show Author Affiliations
Theodore D. Doiron, National Institute of Standards and Technology (United States)
John R. Stoup, National Institute of Standards and Technology (United States)
Patricia Snoots, National Institute of Standards and Technology (United States)
Grace Chaconas, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 1335:
Dimensional Stability
Roger A. Paquin, Editor(s)

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