Dynamic characteristics of enhanced Al/PTFE and real-time quantitative evaluation of impact release energy under vacuum environment

Aluminum/Polytetrafluoroethylene (Al/PTFE) reactive material occurs chemical reaction and release a large amount of energy under the impact load, which has the dual characteristics of strength and energy release, so it can be applied to the attack of confined space targets to enhance the damage effe...

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Autores principales:	Enling Tang, Zhimin Sun, Yafei Han, Wenhao Yu, Chuang Chen, Mingyang Xu, Mengzhou Chang, Kai Guo, Liping He
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Enhanced Al/PTFE reactive projectile Hypervelocity impact Dynamic characteristic Real-time reactive energy release Quantitative evaluation of energy release Physics QC1-999
Acceso en línea:	https://doaj.org/article/45a4f16737144a06a59c3aabb61b2df4
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spelling	oai:doaj.org-article:45a4f16737144a06a59c3aabb61b2df42021-12-02T05:01:17ZDynamic characteristics of enhanced Al/PTFE and real-time quantitative evaluation of impact release energy under vacuum environment2211-379710.1016/j.rinp.2021.105019https://doaj.org/article/45a4f16737144a06a59c3aabb61b2df42021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2211379721010172https://doaj.org/toc/2211-3797Aluminum/Polytetrafluoroethylene (Al/PTFE) reactive material occurs chemical reaction and release a large amount of energy under the impact load, which has the dual characteristics of strength and energy release, so it can be applied to the attack of confined space targets to enhance the damage effect on the target. In order to study the dynamic strength of enhanced Al/PTFE and the real-time impact release energy, based on the traditional formula Al/PTFE (26.5%/73.5%), enhanced Al/PTFE reactive material specimens were prepared by cold pressing and rapid cooling processes, and the dynamic mechanical properties of the specimens were tested by the Split Hopkinson Pressure Bar (SHPB) testing system. The experiments have been conducted by using two-stage light gas gun loading system combining with the impact release energy related testing system under vacuum condition. Meanwhile, the evolutionary process of reaction product was numerically simulated by ANSYS/Fluent, and the boundary conditions of the numerical simulation were defined by self-programmed UDF subroutine. Experiments, theoretical analysis and numerical simulation were adopted to obtain the real time energy release of Al/PTFE reactive materials at different impact velocities. The results show that the maximum dynamic failure strength of the enhanced Al/PTFE reactive projectile is 126 MPa, and the strain rate hardening phenomenon and viscoelastic effect are exhibited when the strain rate is in the range of 1500 ∼ 3000 s−1. When the strain rate is in the range of 3000 ∼ 4000 s−1, the specimen is insensitive to strain rate. When the impact velocities are 2.30 km/s and 2.54 km/s, the energies that the reactive projectiles release are 8.36 kJ/g and 8.38 kJ/g, respectively, and the reactive material reacts completely. When the impact velocities are 1.64 km/s, 1.80 km/s and 1.94 km/s, the projectiles have not fully reacted. The reactive degree of the reactive projectile increases with the increase of the impact velocity. For the complete reaction of Al/PTFE reactive projectile, the critical impact velocity of the enhanced reactive material is between 1.94 km/s and 2.30 km/s.Enling TangZhimin SunYafei HanWenhao YuChuang ChenMingyang XuMengzhou ChangKai GuoLiping HeElsevierarticleEnhanced Al/PTFE reactive projectileHypervelocity impactDynamic characteristicReal-time reactive energy releaseQuantitative evaluation of energy releasePhysicsQC1-999ENResults in Physics, Vol 31, Iss , Pp 105019- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Enhanced Al/PTFE reactive projectile Hypervelocity impact Dynamic characteristic Real-time reactive energy release Quantitative evaluation of energy release Physics QC1-999
spellingShingle	Enhanced Al/PTFE reactive projectile Hypervelocity impact Dynamic characteristic Real-time reactive energy release Quantitative evaluation of energy release Physics QC1-999 Enling Tang Zhimin Sun Yafei Han Wenhao Yu Chuang Chen Mingyang Xu Mengzhou Chang Kai Guo Liping He Dynamic characteristics of enhanced Al/PTFE and real-time quantitative evaluation of impact release energy under vacuum environment
description	Aluminum/Polytetrafluoroethylene (Al/PTFE) reactive material occurs chemical reaction and release a large amount of energy under the impact load, which has the dual characteristics of strength and energy release, so it can be applied to the attack of confined space targets to enhance the damage effect on the target. In order to study the dynamic strength of enhanced Al/PTFE and the real-time impact release energy, based on the traditional formula Al/PTFE (26.5%/73.5%), enhanced Al/PTFE reactive material specimens were prepared by cold pressing and rapid cooling processes, and the dynamic mechanical properties of the specimens were tested by the Split Hopkinson Pressure Bar (SHPB) testing system. The experiments have been conducted by using two-stage light gas gun loading system combining with the impact release energy related testing system under vacuum condition. Meanwhile, the evolutionary process of reaction product was numerically simulated by ANSYS/Fluent, and the boundary conditions of the numerical simulation were defined by self-programmed UDF subroutine. Experiments, theoretical analysis and numerical simulation were adopted to obtain the real time energy release of Al/PTFE reactive materials at different impact velocities. The results show that the maximum dynamic failure strength of the enhanced Al/PTFE reactive projectile is 126 MPa, and the strain rate hardening phenomenon and viscoelastic effect are exhibited when the strain rate is in the range of 1500 ∼ 3000 s−1. When the strain rate is in the range of 3000 ∼ 4000 s−1, the specimen is insensitive to strain rate. When the impact velocities are 2.30 km/s and 2.54 km/s, the energies that the reactive projectiles release are 8.36 kJ/g and 8.38 kJ/g, respectively, and the reactive material reacts completely. When the impact velocities are 1.64 km/s, 1.80 km/s and 1.94 km/s, the projectiles have not fully reacted. The reactive degree of the reactive projectile increases with the increase of the impact velocity. For the complete reaction of Al/PTFE reactive projectile, the critical impact velocity of the enhanced reactive material is between 1.94 km/s and 2.30 km/s.
format	article
author	Enling Tang Zhimin Sun Yafei Han Wenhao Yu Chuang Chen Mingyang Xu Mengzhou Chang Kai Guo Liping He
author_facet	Enling Tang Zhimin Sun Yafei Han Wenhao Yu Chuang Chen Mingyang Xu Mengzhou Chang Kai Guo Liping He
author_sort	Enling Tang
title	Dynamic characteristics of enhanced Al/PTFE and real-time quantitative evaluation of impact release energy under vacuum environment
title_short	Dynamic characteristics of enhanced Al/PTFE and real-time quantitative evaluation of impact release energy under vacuum environment
title_full	Dynamic characteristics of enhanced Al/PTFE and real-time quantitative evaluation of impact release energy under vacuum environment
title_fullStr	Dynamic characteristics of enhanced Al/PTFE and real-time quantitative evaluation of impact release energy under vacuum environment
title_full_unstemmed	Dynamic characteristics of enhanced Al/PTFE and real-time quantitative evaluation of impact release energy under vacuum environment
title_sort	dynamic characteristics of enhanced al/ptfe and real-time quantitative evaluation of impact release energy under vacuum environment
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/45a4f16737144a06a59c3aabb61b2df4
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_version_	1718400825412288512

Dynamic characteristics of enhanced Al/PTFE and real-time quantitative evaluation of impact release energy under vacuum environment

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