Simulation of Damage Caused by Fluoropolymer Reactive Material Based on Adaptive FEM-SPH Method

A adaptive finite element method-smoothed particle hydrodynamics (FEM-SPH) coupling method is employed to accurately simulate the application of fluoropolymer-based reactive materials in penetrator and their damage process against targets based on the impact-induced failure and initiation mechanism of fluoropolymer-based reactive materials. The entire impact-failure-deflagration process of the reactive materials is numerically modeled. The penetration and damage processes of reactive fragments against double-layer aluminum targets under different velocities are simulated, and the validity and reliability of the simulation method are verified by comparing the simulated results with the experimental data. The results demonstrate that the FEM-SPH method and the ignition and growth model are used to effectively reproduce the damage process of reactive fragments penetrating a target and their subsequent deflagration effects, clearly reflecting the dynamic response characteristics such as impact-induced reactions and intense secondary collision reactions. The proposed simulation model provides a numerical analysis basis and methodological support for the structural design, performance evaluation, and optimization of fluoropolymer-based reactive materials in fragment and penetrating ammunition.