铝纤维增强铝 / 聚四氟乙烯活性材料力学性能及反应特性

To investigate the effect of fiber content on the mechanical properties and reaction characteristics of aluminum / polytetrafluoroethylene (Al / PTFE) reactive material, the static and dynamic mechanical responses, and impact reaction experiments are carried out using the universal pressure testing machine and the impact loading experimental techniques for aluminum fiber-reinforced reactive materials prepared by molding and sintering method. The deformation failure mechanism of fiber-reinforced reactive materials is revealed by the micromorphology. The result shows that the random distribution of aluminum fibers improves the quasi-static yield strength and dynamic ultimate compressive stress of Al / PTFE significantly by inhibiting crack propagation within the matrix when the content of aluminum fiber (mass ratio) is between 1% and 4% . The dynamic mechanical properties of Al / PTFE are optimal when the content of aluminum fiber is 1% . Damage caused by aluminum fiber penetrating through the reactive material matrix under impact loading is a major factor limiting the reinforcement effect by the increased fiber mass. On the other hand, the addition of aluminum fibers increases the impact reaction threshold of Al / PTFE under the condition that the theoretical release energy of Al / PTFE is unchanged. The minimum specific incident energy required for the reaction of Al / PTFE increases from 50. 7 J / cm² without fibers to 61. 3 J / cm² with fiber mass of 4%, which increases the impact insensitivity of Al / PTFE.