Abstract
Many scholars have used experimental research methods to conduct extensive research on the impact energy release behavior of Polytetrafluoroethylene(PTFE)/Al reactive materials. However, in numerical simulation, PTFE/Al still lacks the calculation parameters of impact energy release behavior. In order to obtain the simulation parameters of PTFE/Al impact ignition, the Hill mixture law was used to calculate the material parameters of PTFE/Al (mass ratio 73.5/26.5), and according to the Hugoniot curve of PTFE/Al and the γ state equation, the JWL equation of state of a PTFE/Al unreacted substance and reaction product was fitted with a genetic algorithm. According to the PTFE/Al impact energy release experiment, the parameters of the PTFE/Al chemical kinetic equation were determined, and the parameters of the trinomial reaction rate equation were fitted. The obtained parameters were used in the simulation calculation in LS-dyna to predict the damage of the aluminum target plate under the impact of the PTFE/Al reactive fragments.
Highlights
College of Aerospace Science and Engineering, National University of Defense Technology, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China; Abstract: Many scholars have used experimental research methods to conduct extensive research on the impact energy release behavior of Polytetrafluoroethylene(PTFE)/Al reactive materials
Since Willis [1] discovered that PTFE/Al could react under high-speed impact conditions, reactive materials represented by PTFE/Al have gradually been extensively studied
The obtained PTFE/Al simulation parameters are used to simulate the impact of the PTFE/Al reactive fragments on the aluminum target plate
Summary
A reactive material is a compound or mixture that can independently carry out a chemical reaction and release energy. Rosencrantz [20] calculated the state equation parameters of the ignition growth model of PTFE/Al by theory and simulated the reactive fragment impacting the multilayer target at high speed based on LS-dyna. In order to obtain the impact energy release simulation parameters of PTFE/Al, the JWL equation of state of unreacted and reaction products of PTFE/Al (73.5/26.5) was obtained by theoretical calculation, and the reaction rate equation of PTFE/Al was obtained by fitting experimental data. Parameters A, B, R1 , R2 , and ω in Equation (13) were fitted and determined by the impact compression line of PTFE/Al, and the JWL equation of state when the reactive material does not react was obtained.
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