Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Repeatability and reproducibility of compression strength measurements conducted according to ASTM E9

Published

Author(s)

William E. Luecke, Stephen Graham, Matthew Adler, Li Ma

Abstract

Ten commercial laboratories participated in an interlaboratory study to establish the repeatability and reproducibility of compression strength tests conducted according to ASTM International Standart Test Method E9. The test employed a cylindrical aluminum AA2024-T351 test specimen. Participants measured elastic modulus and 0.2 % offset yield strength, YS(0.2 % offset), using an extensometer attached to the specimen. The repeatability and reproducibility of the yield strength measurement, expressed as coefficient of variations werecvr= 0.011 and cvR= 0.020 The reproducibility of the test across the laboratories was among the best that has been reported for uniaxial tests. The reported data indicated that using diametrally opposed extensometers, instead of a single extensometer doubled the precision of the test method. Laboratories that did not lubricate the ends of the specimen measured yield stresses and elastic moduli that were smaller than those measured in laboratories that lubricated the specimen ends. The modulus measured from stress- strain data were reanalyzed using a technique that finds the optimal fit range, and applies several quality checks to the data. The error in modulus measurements from stress-strain curves generally increased as the fit range decreased to less than 40 % of the stress range.
Citation
Technical Note (NIST TN) - 1679
Report Number
1679

Keywords

compression, testing, ILS, ASTM, E9, yield strength, elastic modulus

Citation

Luecke, W. , Graham, S. , Adler, M. and Ma, L. (2013), Repeatability and reproducibility of compression strength measurements conducted according to ASTM E9, Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.TN.1679 (Accessed July 31, 2021)
Created February 14, 2013, Updated November 10, 2018