Mechanical Properties and Reaction Characteristics of Aluminum Fiber Reinforced Aluminum/polytetrafluoroethylene Reactive Material

doi:10.12382/bgxb.2023.0101

Abstract

Abstract:

To investigate the effect of fiber content on the mechanical properties and reaction characteristics of aluminum/polytetrafluoroethylene (Al/PTFE) reactive material, the static and dynamic mechanical responses, and impact reaction experiments are carried out using the universal pressure testing machine and the impact loading experimental techniques for aluminum fiber-reinforced reactive materials prepared by molding and sintering method. The deformation failure mechanism of fiber-reinforced reactive materials is revealed by the micromorphology. The result shows that the random distribution of aluminum fibers improves the quasi-static yield strength and dynamic ultimate compressive stress of Al/PTFE significantly by inhibiting crack propagation within the matrix when the content of aluminum fiber (mass ratio) is between 1% and 4%. The dynamic mechanical properties of Al/PTFE are optimal when the content of aluminum fiber is 1%. Damage caused by aluminum fiber penetrating through the reactive material matrix under impact loading is a major factor limiting the reinforcement effect by the increased fiber mass. On the other hand, the addition of aluminum fibers increases the impact reaction threshold of Al/PTFE under the condition that the theoretical release energy of Al/PTFE is unchanged. The minimum specific incident energy required for the reaction of Al/PTFE increases from 50.7J/cm² without fibers to 61.3J/cm²with fiber mass of 4%, which increases the impact insensitivity of Al/PTFE.

Key words: aluminum fiber, aluminum/polytetrafluoroethylene, reactive material, mechanical property, reaction threshold

CLC Number:

TJ04

ZHAO Han, REN Huilan, NING Jianguo. Mechanical Properties and Reaction Characteristics of Aluminum Fiber Reinforced Aluminum/polytetrafluoroethylene Reactive Material[J]. Acta Armamentarii, 2024, 45(5): 1573-1581.

Figures/Tables 17

Fig.1 Preparation process of fiber-reinforced Al /PTFE

Table 1 Parameters of specimen component

编号	Al纤维质量占比/%	Al粉质量占比/%	PTFE粉质量占比/%	密度/ (kg·cm^-3)
AP-0	0	26.5	73.5	2239
AP-1	1	25.5	73.5	2231
AP-2	2	24.5	73.5	2225
AP-4	4	22.5	73.5	2228

Fig.2 Micromorphology of specimen

Fig.3 WDW-300 material testing machine

Fig.4 Schematic diagram of split Hopkinson pressure bar experiment

Fig.5 Single recorded by high dynamic strain indicator

Fig.6 Stress-strain curves of Al/PTFE under quasi-static compression

Table 2 Mechanical parameters of Al/PTFE

No.	Al纤维质量占比/%	弹性模量/MPa	屈服应力/MPa
1	0	227.1	15.8
2	1	302.2	19.1
3	2	331.4	20.4
4	4	396.8	21.2

Fig.7 Micromorphology of specimen after quasi-static compression

Fig.8 Strain-stress curves of fiber-reinforced Al/PTFE and its compressive strength at different strain rates

Fig.9 Micromorphology of specimen after dynamic compression

Fig.10 Images of the reaction of AP-2 specimens under impact loading

Fig.11 Reaction process of AP-1 specimenwith different velocities

Fig.12 Reaction process of AP-4 specimenwith different velocities

Fig.13 Impact sensitivity curves of different Al/PTFE specimens

Table 3 Minimum reaction specific incident energy and maximum unreacted specific incident energy

最小反应比入射能与最大未反应比入射能	编号	比入射能/ (J·cm^-2)
	AP-0	50.7
最小反应比入射能	AP-1	51.1
	AP-2	53.9
	AP-4	61.3
	AP-0	49.5
最大未反应比入射能	AP-1	51.0
	AP-2	54.9
	AP-4	63.4

Fig.14 Micromorphology of specimen after reaction

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