EFFECTS OF FIBER GRIPPING METHODS ON SINGLE FIBER TENSILE TESTS: PARAMETRIC STATISTICAL ANALYSES OF TENSILE STRENGTHS AND FAILURE STRAINS

摘要

The Kolsky bar test has been widely used in measuring material response under high strain rate conditions. Initial experiments in the literature applying this test to measure single fiber properties for fibers used in soft body armor with the Kolsky bar used a short single fiber (2 mm to 10 mm) glued directly to the Kolsky bar, which is time consuming due to curing time and possible adhesive wicking into the fiber gauge length region. To measure single fiber properties reproducibly and reliably, we have been investigating several different gripping methods. We measured single fiber properties under quasi-static conditions using different gripping methods and carried out statistical analyses for tensile strengths and failure strains with 2- and 3- parameter Weibull distributions to study underlying distributions as a function of gripping methods. The work presented here reports on our findings to date.