基于弱耦合跨尺度方法的氟聚物基活性材料冲击力-化学响应行为

doi:10.12382/bgxb.2024.0948

摘要/Abstract

摘要：

为了研究PTFE/Al/W氟聚物基活性材料冲击加载下的力-化学响应行为,开展氟聚物基活性材料落重冲击试验,提出弱耦合跨尺度数值计算方法,基于此方法建立宏观-细观氟聚物基活性材料落重冲击加载反应过程的跨尺度数值仿真模型。结合跨尺度数值仿真对落重冲击试验的宏观、细观结构力化响应行为及冲击激活机理进行讨论分析。分析结果表明:W含量对氟聚物基活性材料冲击激活反应影响显著,随着W含量增加,材料体系冲击激活阈值降低;弱耦合跨尺度数值仿真分析模型有效模拟了氟聚物基活性材料的力-化学响应过程;X型剪切带是氟聚物基活性材料破碎、激活引发反应的主要机制,其形成、演化和分布受W含量影响较大。

关键词: 活性材料, 落重冲击, 弱耦合跨尺度, 力-化学特性

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

中图分类号:

TJ410.4

闫月光, 葛超, 张勇, 王晋, 吕博宇, 余庆波, 王海福. 基于弱耦合跨尺度方法的氟聚物基活性材料冲击力-化学响应行为[J]. 兵工学报, 2025, 46(8): 240948-.

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-.

图/表 20

表1 PTFE/Al/W材料组分体系构成

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

图1 氟聚物基活性材料烧结温度时程曲线

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

图2 氟聚物基活性材料试样

Fig.2 Fluoropolymer-matrix reactive material specimens

图3 落重冲击装置结构

Fig.3 Drop-weight impact apparatus structure

图4 不同落高条件下氟聚物基活性材料冲击反应行为

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

图5 落高h=100cm条件下氟聚物基活性材料冲击响应行为

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

图6 落重冲击后氟聚物基活性材料残留试样

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

图7 弱耦合跨尺度计算流程

Fig.7 Weak coupling trans-scale computational process

图8 宏观加载模型

Fig.8 Macro loading model

图9 3种材料细观模型

Fig.9 Three material microscale models

表2 组分材料本构方程参数

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

表3 组分材料状态方程参数

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

图10 实验结果和数值仿真结果

Fig.10 Experimental and numerically simulated results

表4 实验[25]与本文仿真所得Hugoniot参数对比

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

图11 试样剪切应力分布及时程曲线数值模拟结果

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

图12 氟聚物基活性材料细观温度演化

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

表5 冲击激活理论相关参数

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

图13 氟聚物基活性材料细观反应度演化

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

图14 不同W含量PTFE/Al/W活性材料反应度曲线

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

图15 氟聚物基活性材料细观尺度反应度比较

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

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