Mechanical Properties and Reaction Characteristics of Aluminum Fiber Reinforced Aluminum/polytetrafluoroethylene Reactive Material
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.
万方数据
维普
