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25 February 1993 Exact derivation of the tensile strain and strain rate equations for a rotating capstan fiber tester
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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.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James J. Carr and Donald R. Dreyer "Exact derivation of the tensile strain and strain rate equations for a rotating capstan fiber tester", Proc. SPIE 1791, Optical Materials Reliability and Testing: Benign and Adverse Environments, (25 February 1993); https://doi.org/10.1117/12.141154
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