Abstract
Al-PTFE (aluminum-polytetrafluoroethylene) is a typical kind of Reactive Material (RM), which has a variety of potential applications in weapon systems. In this paper, quasi-static compression experiments were carried out for a pressed and sintered mixture of Al and PTFE powders using a microcomputer-controlled electronic universal testing machine. The results show that both the mechanical property and reactive behavior of Al-PTFE are strongly temperature-dependent. The material undergoes a brittle-ductile transition associated with a temperature-induced crystalline phase transformation of the PTFE matrix. At low temperatures (−18, 0, and 16 °C), samples of Al-PTFE failed with shear crack and no reaction was observed. As the temperature increased (22, 35, and 80 °C), Al-PTFE exhibited a high toughness and violent reaction occurred in all of the tested samples. Scanning electron microscope observations showed different fracture mechanisms of the PTFE matrix and the increase in toughness was due to the formation of PTFE fibrils which could dissipate energy and bridge crack plane during plastic deformation.
Highlights
Reactive Material (RM), which consists of at least two non-explosive solid components, can release a great amount of energy and make effective damage upon impacting with targets
The mechanical properties and reactive behavior of Al-PTFE under quasi-static compression were investigated at temperatures between −18 and 80 ◦ C, which were chosen to compression were investigated at temperatures between −18 and 80 °C, which were chosen to encompass the three crystalline phases of PTFE with transitions at 19 and 30 ◦ C
Sufficient toughness and an abrupt energy release are two decisive factors for the reaction of the Al-PTFE sample under quasi-static compression
Summary
Reactive Material (RM), which consists of at least two non-explosive solid components, can release a great amount of energy and make effective damage upon impacting with targets. The mechanical behavior of Al-W-PTFE by differing the W content and particle size. Thethefollowing sintering temperature, equivalence equivalence ratio, ratio, and and Al particle temperature, particle size on the the reaction reaction phenomenon phenomenon under under quasi-static quasi-static compression and a crack-induced initiation mechanism was proposed, while the effect of temperature proposed, was not taken into account either. Structure) isisabout about330 which is much higher thanofthat of the corresponding hydrocarbon structure). In the crystalline regions four both Cof[14,15,16], which both are of second-order transitions. ◦ turn [19] to in the helical conformation a well-ordered triclinic structure atoms/180 helical conformation from from a well-ordered triclinic structure withwith. The first-order transitions crystalline are reversible and unique [21]. Al-PTFEover overthe the normal normal range range of temperature-induced phase transitions onon thetheproperties operating temperatures
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