Mechanochemical Response of Fluoropolymer-matrix Reactive Materials Subjected to Shock Loading Based on Weak Coupling Trans-scale Method

doi:10.12382/bgxb.2024.0948

Abstract

Abstract:

In order to study the mechanochemical response behavior of PTFE/Al/W fluoropolymer-matrix reactive materials under shock loading,the drop-weight impact test of fluoropolymer-matrix reactive materials is carried out,and a weak coupling trans-scale numerical calculation method is proposed.Based on this method,a trans-scale numerical simulation model is established for the drop-weight impact loading reaction process of macro-meso scale fluoropolymer-matrix reactive material.The mechanochemical response behaviors and impact activation mechanisms of macroscopic and mesoscopic structures of sample in the drop-weight impact test are discussed and analyzed through trans-scale numerical simulation.The results show that the content of W has a significant effect on the impact activation reaction of fluoropolymer-matrix reactive materials,and the impact activation threshold of the reactive materials system decreases with the increase of W content.The weak coupling trans-scale numerical simulation analysis model effectively simulates the mechanochemical response process of fluoropolymer-matrix reactive materials.The X-shaped shear band is the dominant mechanism for the breakage and activation of fluoropolymer-matrix reactive materials,and its formation,evolution and distribution are greatly affected by W content.

Key words: reactive materials, drop-weight impact, weak coupling trans-scale, mechanochemical properties

CLC Number:

TJ410.4

YAN Yueguang, GE Chao, ZHANG Yong, WANG Jin, LÜ Boyu, YU Qingbo, WANG Haifu. Mechanochemical Response of Fluoropolymer-matrix Reactive Materials Subjected to Shock Loading Based on Weak Coupling Trans-scale Method[J]. Acta Armamentarii, 2025, 46(8): 240948-.

Figures/Tables 20

Table 1 Composition of PTFE/Al/W material component system

材料类型	质量分数/wt.%			理论密度/ (g·cm^-3)
材料类型	PTFE	Al	W	理论密度/ (g·cm^-3)
A	73.5	26.5	0	2.31
B	68.8	24.2	7	2.46
C	63.6	22.4	14	2.61

Fig.1 Sintering temperature-time curves of fluoropolymer-matrix reactive materials

Fig.2 Fluoropolymer-matrix reactive material specimens

Fig.3 Drop-weight impact apparatus structure

Fig.4 Impact response behaviors of fluoropolymer-matrix reactive materials under different drop height conditions

Fig.5 Shock response behaviors of fluoropolymer-matrix reactive materials for drop height h=100cm

Fig.6 Residual samples of fluoropolymer-matrix reactive materials after drop-weight impact

Fig.7 Weak coupling trans-scale computational process

Fig.8 Macro loading model

Fig.9 Three material microscale models

Table 2 Constitutive equation parameters of component materials

材料	A/MPa	B/MPa	n	C	m	T_m/K
Al	265	426	0.34	0.015	1	775
PTFE	11	44	1	0.12	1	600
W	1510	177	0.12	0.016	1	1748

Table 3 Equation of state parameters of component materials

材料	ρ₀/(g·cm^-3)	c₀/(m·s^-1)	s	Γ₀
Al	2.71	5250	1.37	1.97
PTFE	2.15	1680	1.12	0.59
W	18.1	4000	1.27	1.54

Fig.10 Experimental and numerically simulated results

Table 4 Comparison of Hugoniot parameters obtained from the experiment[25] and the simulation of this study

数据来源	a₀/(m·s^-1)	s
Yang等^[25]	1544.23	2.18
本文仿真	1585.71	1.88

Fig.11 The numerically simulated results for the shear stress distribution and time history curve of sample

Fig.12 Mesoscopic temperature evolution of fluoropolymer-matrix reactive materials

Table 5 Parameters related to impact activation theory

参数	E_a /(kJ·mol^-1)	R_u/(mol·K)	T_r/℃	n
数值	50.836	8.314J	550	1.5

Fig.13 Mesoscopic reactivity evolution of fluoropolymer-matrix active materials

Fig.14 Reactivity curves of PTFE/Al/W reactive materials with different W contents

Fig.15 Comparison of meso-scale reactivities of fluoropolymer-matrix reactive materials

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