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Polymers 2016, 8(10), 356;

The Effect of Crystallinity on Compressive Properties of Al-PTFE

College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China
The Equipment Research Institute of the Rocket Force, Beijing 10085, China
Authors to whom correspondence should be addressed.
Academic Editor: Frank Wiesbrock
Received: 23 August 2016 / Revised: 24 September 2016 / Accepted: 30 September 2016 / Published: 11 October 2016
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Al-PTFE (Al-polytetrafluoroethene) is an important kind of Reactive Material (RM), however only limited importance was placed to the effect of crystallinity of PTFE on the mechanical and reactive behavior. This paper investigated the influence of crystallinity on the compression behavior of Al-PTFE at strain rates range from 10−2 to 3 × 103 s−1. Two kinds of samples were prepared by different sintering procedures to acquire different crystallinity. The samples’ crystallinity was characterized by the density method and X-ray diffraction method. The samples were tested using an electro-hydraulic press for quasi-static loading, and split Hopkinson pressure bars (SHPBs) for high strain rates. Low crystalline samples have consistently higher strength and toughness than the high crystalline samples. The phenomenon was explained by an “elastic-plastic network” model combined with the effect of chain entanglement density. A bilinear dependence of true stress on log ε ˙ was observed, and Johnson-Cook models were fitted separately according to the different strain rate sensitivity. Finally, a close connection between fracture and initiation of Al-PTFE was confirmed in quasi-static tests, SHPB tests, and drop weight tests. It was hypothesized that the high temperature at the crack tips of PTFE is an important promoting factor of initiation. View Full-Text
Keywords: Al-PTFE; crystallinity; quasi-static compression; high strain rate mechanical properties Al-PTFE; crystallinity; quasi-static compression; high strain rate mechanical properties

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Feng, B.; Fang, X.; Wang, H.-X.; Dong, W.; Li, Y.-C. The Effect of Crystallinity on Compressive Properties of Al-PTFE. Polymers 2016, 8, 356.

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