EFFECTS OF GAGE LENGTH AND LOADING RATES ON THE STRENGTH OF PPTA FIBERS

摘要

Axial tension and transverse compression experiments on single fibers were performed to investigate the mechanical behavior of three high-performance fibers (Kevlar, Kevlar 129, and Twaron) with diameters in the order of 9～12μm. The single fibers were manufactured from 1998 through 2008. A miniaturized tensile Kolsky bar was used to determine the tensile response of PPTA single fibers at a high strain rate. Gage length and strain rate were found to have minimum effects on the tensile strength of PPTA single fibers. Manufacturing time over a decade was found to have negligible effects on the tensile strength of the fibers.