The damage of aramid fibers occurs easily in torsion fatigue.So the effects of temperature and pre-tension on the torsion fatigue lifetimes of Nomex and Kevlar 49 fibers were characterized and compared by twist testin...The damage of aramid fibers occurs easily in torsion fatigue.So the effects of temperature and pre-tension on the torsion fatigue lifetimes of Nomex and Kevlar 49 fibers were characterized and compared by twist testing.The experimental results show that there is a linear relationship between the logarithm of the fatigue lifetime and the pre-tension,and an exponential attenuation with the raise of temperature,respectively;and the torsion fatigue lifetime of Nomex is distinctly longer than that of Kevlar 49 at every test condition,but it is less sensitive to the variation of the pre-tension and temperature.展开更多
The mechanical properties and material volume fractions of PTFE/Kevlar49/PA6 composite are studied. The focus of this paper is to get the relationship between the volume fraction of three constituents and the mechanic...The mechanical properties and material volume fractions of PTFE/Kevlar49/PA6 composite are studied. The focus of this paper is to get the relationship between the volume fraction of three constituents and the mechanical properties of the composite by doing tensile, hardness and wear test. The effect of the constituent volume fractions was evaluated. Short Kevlar49 fibers reinforced PA6 （Polyamide 6） with PTFE filler were studied in five different combinations. The results of the experiments show that the mechanical properties increase with Keviar fibers increase, then they decrease after the Kevlar fiber volume reaches one number.展开更多
文摘The damage of aramid fibers occurs easily in torsion fatigue.So the effects of temperature and pre-tension on the torsion fatigue lifetimes of Nomex and Kevlar 49 fibers were characterized and compared by twist testing.The experimental results show that there is a linear relationship between the logarithm of the fatigue lifetime and the pre-tension,and an exponential attenuation with the raise of temperature,respectively;and the torsion fatigue lifetime of Nomex is distinctly longer than that of Kevlar 49 at every test condition,but it is less sensitive to the variation of the pre-tension and temperature.
文摘The mechanical properties and material volume fractions of PTFE/Kevlar49/PA6 composite are studied. The focus of this paper is to get the relationship between the volume fraction of three constituents and the mechanical properties of the composite by doing tensile, hardness and wear test. The effect of the constituent volume fractions was evaluated. Short Kevlar49 fibers reinforced PA6 （Polyamide 6） with PTFE filler were studied in five different combinations. The results of the experiments show that the mechanical properties increase with Keviar fibers increase, then they decrease after the Kevlar fiber volume reaches one number.
