Dynamic Constitutive Model of Tungsten-Whisker-Reinforced Aluminum/Polytetrafluoroethylene Composite Material and Quantitative Determination of Impact Reaction Release Energy in Vacuum Environment

Abstract

To meet the strength requirements of aluminum/polytetrafluoroethylene (Al/PTFE) in practical applications, tungsten (W) whisker is added into the traditional formula Al/PTFE (26.5%/73.5%) to improve the dynamic compressive strength of the reactive material. Mechanical properties of reactive material specimens prepared by sintering are tested. In the results, it is shown that the dynamic compressive strength of Al/PTFE-reactive material reinforced by tungsten whisker with volume fraction of 13.1% can reach 141 MPa at strain rate of 1800 s⁻¹. The constitutive model of dynamic compression for tungsten-whisker-enhanced Al/PTFE-reactive material is constructed, and the results are basically consistent with the experimental results. The quantitative impact energy release of reactive material specimens under vacuum environment are performed by using the two-stage light gas gun loading system, and the quantitative impact release energies of Al/PTFE-reactive material reinforced by tungsten whisker under different whisker percentage content and diameter are obtained.