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 raternconditions. Initial experiments in the literature applying this test to measure single fiberrnproperties for fibers used in soft body armor with the Kolsky bar used a short single fiber (2 mmrnto 10 mm) glued directly to the Kolsky bar, which is time consuming due to curing time andrnpossible adhesive wicking into the fiber gauge length region. To measure single fiber propertiesrnreproducibly and reliably, we have been investigating several different gripping methods. Wernmeasured single fiber properties under quasi-static conditions using different gripping methodsrnand carried out statistical analyses for tensile strengths and failure strains with 2- and 3-rnparameter Weibull distributions to study underlying distributions as a function of grippingrnmethods. The work presented here reports on our findings to date.