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Statistical comparisons of single PPTA fiber tensile behaviors measured by different gripping methods

Published

Author(s)

Jae Hyun Kim, Nathanael A. Heckert, Stefan D. Leigh, Haruki Kobayashi, Walter G. McDonough, Kirk D. Rice, Gale A. Holmes

Abstract

A new single fiber tensile test method using the Kolsky bar is being utilized to investigate fiber properties under high strain rate conditions. Since fiber tensile properties exhibit broad, dispersed distributions, a large number of test specimens are required to conduct a meaningful statistical analysis. It is an important experimental challenge to perform high throughput tests under high strain rate conditions when one needs to grip a single fiber in a reliable and reproducible manner. This presentation investigates the feasibility of three fiber gripping methods for application in a high strain rate test. One method consisted of adhering a fiber to a template following the prodecure described in ASTM C1557-03. The other two methods involve directly clamping a fiber using PMMA (polymethyl methacrylate) and rubber. In preliminary tests under quasi-static loading conditions when gluing a fiber and directly gripping a fiber by PMMA, tensile failure strains of PPTA fibers showed significant differences at the shorter gauge lengths compared to the longer gauge lengths. Graphical statistical analyses confirm these differences in failure strains.
Proceedings Title
Society for the Advancement of Material and Process Engineering
Conference Dates
May 21-24, 2012
Conference Location
Baltimore, MD

Keywords

soft body armor, High strain rate test, single fiber, PPTA fiber

Citation

, J. , Heckert, N. , Leigh, S. , Kobayashi, H. , McDonough, W. , Rice, K. and Holmes, G. (2012), Statistical comparisons of single PPTA fiber tensile behaviors measured by different gripping methods, Society for the Advancement of Material and Process Engineering, Baltimore, MD (Accessed March 3, 2024)
Created May 24, 2012, Updated May 24, 2017