Numerical Research on Impact Ignition Reaction Behavior of Fluoropolymer-Based Reactive Materials

doi:10.12382/bgxb.2025.0060

Abstract

Abstract:

To study the energy release behavior of impact ignition and deflagration reactions in fluorinated polymer based reactive materials,Based on experimental observations, cumulative temperature rise ignition mechanism and transient thermal diffusion reaction mechanism were proposed, and thermal coupling simulation of Taylor rod impact ignition process of active material was carried out, and the simulation provided the local hot spot temperature rise under the corresponding mechanism. On this basis, a heat transfer-chemical reaction model for fractured materials was constructed using the bond-based peridynamics thermal diffusion theory and combined with local hotspot information. The solution results were verified and analyzed using infrared temperature measurement experiments. The results showed that the simulation characteristics of deformation and fragmentation of the Taylor rod before ignition reaction are basically consistent with the experimental recorded images, which well reflects the inert response of the reactive material. By superimposing adiabatic shear temperature rise and friction temperature rise, a local area of the rod can form a hot spot region that meets the ignition threshold which basically corresponds to the location of the first flare, the distribution of adiabatic shear temperature rise and friction temperature rise is uneven, with significant differences in starting positions, and adiabatic shear temperature rise plays a dominant role in the total impact temperature rise, implying that the ignition mechanism of cumulative temperature rise can describe the impact ignition characteristics of materials. The simulation of deflagration reaction process proves that the temperature distribution inside the flame is directly affected by the mass and morphology distribution of impact fractured materials; Compared to the heat transfer effect, the reaction heat continuously released as the reactivity of the active site increases plays a crucial role in maintaining the high temperature state of the region.

Key words: reactive materials, impact initiation, deflagration reaction, thermochemical coupling, peridynamics

CLC Number:

O383
TJ410.2

LI Zheng, MA Tianbao. Numerical Research on Impact Ignition Reaction Behavior of Fluoropolymer-Based Reactive Materials[J]. Acta Armamentarii, 2025, 46(10): 250060-.

Figures/Tables 28

Fig.1 Evidence of shear-induced ignition in a Taylor test of PTFE/Al[2]

Fig.2 Adiabatic shear bandat the front of crack tip

Fig.3 Illustration of regional characteristics on impact interface

Fig.4 Longitudinal splitting in a Taylor test of PTFE/Al [20]

Table 1 Material model parameters of PTFE/Al[12,15,17,27]

参数	数值	参数	数值
ρ₀/(kg·m^-3)	2260	m	0.7328
E/MPa	750	T_m/K	597
v	0.38	T_r/K	293
C_p/(J·kg^-1·K^-1)	1.16×10³	${\stackrel{·}{\epsilon }}_{0}$	1
λ_b/(W·m^-1·K^-1)	0.52	β	0.7
λ_s/(W·m^-1·K^-1)	45	D₁	0.23
α_ex/℃^-1	1.24×10^-7	c₀/(cm·μs^-1)	1.84
A/MPa	13.38	s	1.707
B/MPa	84. 64	Γ₀	0.59
n	0.4527	μ	0.14
C	0.374	V_f	22.7%

Fig.5 Finite element mesh model of Taylor impact test

Fig.6 Flowchart of thermodynamic coupling algorithm

Fig.7 Schematic of the domain search-averaging method

Fig.8 Al/PTFE Taylor-rod impact deformation profile

Fig.9 Taylor rod impact axial velocity distribution

Fig.10 Comparison of impact-initiated behavior at the impact end of Taylor rod

Fig.11 Evolution of temperature rise distribution within adiabatic shear bands

Fig.12 Shear deformation power per unit volume

Fig.13 Temperature response history under impact load

Fig.14 Total temperature rise and friction temperature at the highest temperature rise point and nearby hotspots

Fig.15 Combustion wave structure of fluorinated polymer-based reactive materials

Fig.16 Reaction pathway of aluminum core in fluorine-containing gas

Fig.17 Schematic diagram of interactions between PD points

Fig.18 DSCAN clustering analysis results

Fig.19 Surface profile reconstruction of point cloud

Fig.20 Flow chart of peridynamics calculation

Fig.21 Infrared temperature measurement experimental System

Fig.22 The deflagration reaction process of reactive fragments

Fig.23 Proportion of explosion flame area and its expansion velocity over time

Fig.24 Solid products on the surface of reaction residue

Fig.25 Comparison of temperature distribution and reaction state in deflagration reaction field (left: thermal imaging temperature; mid: simulation temperature; right: simulation reactivity)

Fig.26 The maximum and average temperature rise of the deflagration reaction field

Fig.27 Macro reaction ratio curve

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