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Proceedings Paper

Exact derivation of the tensile strain and strain rate equations for a rotating capstan fiber tester
Author(s): James J. Carr; Donald R. Dreyer
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Paper Abstract

A rotating capstan fiber tester (RCFT) differs from an Instron-type translating test device primarily in the method of strain. That is, even with a constant capstan rotation rate, an RCFT does not strain fiber at a uniform (constant) rate. In this paper exact relationships for RCFT strain and strain rate are derived. Strain is an exponential function of rotation and strain rate is a function of instantaneous strain. It is shown however that the difference between a rate assumed constant and an exact, strain dependent strain rate is negligible with respect to resulting break strengths. Preliminary comparison testing demonstrates that the mean strength values between instruments are, within measurement variability, different by no more than predicted levels of a fraction of a percent.

Paper Details

Date Published: 25 February 1993
PDF: 5 pages
Proc. SPIE 1791, Optical Materials Reliability and Testing: Benign and Adverse Environments, (25 February 1993); doi: 10.1117/12.141154
Show Author Affiliations
James J. Carr, Corning Incorporated (United States)
Donald R. Dreyer, Corning Incorporated (United States)

Published in SPIE Proceedings Vol. 1791:
Optical Materials Reliability and Testing: Benign and Adverse Environments
Roger A. Greenwell; Dilip K. Paul, Editor(s)

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