EXPERIMENTAL STUDY ON TENSILE BEHAVIOR OFSHORT FIBER REINFORCED NYLON-6 AT DIFFERENTSTRAIN RATE AND TEMPERATURE

摘要

Tensile behavior of extruded short E-glass fiber reinforced nylon-6 composite sheetrn(Trade name: Capron 9233) has been determined at different temperatures (25℃, 50℃,rn75℃, 100℃) and different strain rates (0.05/min, 0.5/min, 5/min). Experimental resultsrnshow that this composite is a typical strain rate and temperature dependent material. Bothrnelastic modulus and tensile strength of the composite increased with strain rate andrndecreased with temperature. Experimental results also show that strain rate sensitivity ofrncomposite change at a temperature between 25 and 50℃ as a result of the glass transitionrnof the nylon-6 matrix. Based on the experimental stress-strain curves, a nonlinear strainrnrate and temperature dependent constitutive model has been established to describe therntensile behavior of short fiber reinforced nylon 6 composite. The parameters in this modelrnare strain exponent m and the compliance factor β . It is shown that the strain exponent mrnis not only strain rate independent, but also temperature independent. The compliancernfactor β , on the other hand, varies with both strain rate as well as temperature.