| Abstract: | The metal/fluoro-ploymer energetic composite is a new kind
of advanced energetic material. The compressive behaviors and reactive
performance of polytetrafluorethylene (PTFE)/Al reactive material based on
different Al contents are investigated experimentally by split Hopkinson
pressure bar (SHPB) and universal testing machine at different strain rates
(ranged from 10^{-3}s^{-1} to 10^{3}s^{-1}) respectively at
room temperature. The experimental results showed that the compressive
behavior of PTFE/Al is sensitive to strain rates, that is, the dynamic
modulus and strength are higher at the high strain rate, while the strain is
lower. The failure behavior of PTFE/Al includes plastic deformation, crack
and reaction. Along with the increasing of Al content in PTFE/Al, the
compressive strength is enhanced and then decreased, which achieves a
maximal value of 102.6 MPa with static loading and 154 MPa with dynamic
loading, respectively, at the content of 35 wt{\%} Al. Meanwhile, the
difficulty of reaction is increased and perfectibility of reaction is
decreased with the increase of strain rate, while the corresponding stress
to initiate reaction of PTFE/Al is almost to be about 165 MPa. |
