Impact-Initiation Sensitivity of High-Temperature PTFE-Al-W Reactive Materials

Sun, Tao; Zheng, Yuanfeng; Yuan, Ying; Wang, Haifu

doi:10.3390/cryst12010030

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…In addition, the works of Feng et al. [23, 30] and Wang [31] proposed that the ignition of Al/PTFE material is closely related to microcrack formation, and the reaction begins in the local high‐temperature region at the tip of rapid crack growth. With an increased GTB, the number of microcracks in the Al/THV(/GTB) composites increased under ∼6000 s −1 compression.…”

Section: Resultsmentioning

confidence: 99%

“…Walley et al [29] summarised the causes of hot spot formation as (a) adiabatic compression of bubbles (or space in solid powder), (b) friction between collision surfaces, (c) viscous heating caused by rapid flow, and (d) adiabatic shear band. In addition, the works of Feng et al [23,30] and Wang [31] proposed that the ignition of Al/PTFE material is closely related to microcrack formation, and the reaction begins in the local high-temperature region at the tip of rapid crack growth. With an increased GTB, the number of microcracks in the Al/THV(/GTB) composites increased under ~6000 s À 1 compression.…”

Section: Discussionmentioning

confidence: 99%

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Effects of Glycerol Tribenzoate on the Mechanical Properties and Reaction Characteristics of Al/THV Reactive Materials Prepared by Extrusion‐Injection Molding

Wang

Zhao

et al. 2022

Propellants Explo Pyrotec

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The metal/fluoropolymer reactive material, Al/ THV composites, can be prepared effectively into different shapes by extrusion injection molding. In this study, glycerol tribenzoate (GTB) plasticizer was introduced into Al/THV (35/65 wt %) prepared by extrusion and injection molding. The addition of GTB significantly affected certain properties of the matrix (THV), which consequently affected the mechanical properties and impact energy-release characteristics of the reactive material. Research shows that the addition of GTB can improve the plasticity of Al/THV(/GTB) composites under quasi-static compression and strain rate sensitivity under 2000-6000 s À 1 dynamic compression. Be-sides, the addition of GTB caused the Al/THV/GTB composites to ignite later than the Al/THV composite. The impact ignition threshold of Al/THV(/GTB) composites increased from 5100 to 5550 s À 1 with an increased GTB content. The impact ignition delay and increased impact ignition threshold of Al/THV/GTB were demonstrated through the temperature rise theory at the tip of crack propagation. In addition, under dynamic compression, more "hot spots"(origins of the reaction) in the Al/THV/GTB composites than in Al/ THV composite caused by a rapid crack propagation increased the reaction percentage and improved the combustion duration of impact-triggered reactions.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of Glycerol Tribenzoate on the Mechanical Properties and Reaction Characteristics of Al/THV Reactive Materials Prepared by Extrusion‐Injection Molding

Wang

Zhao

et al. 2022

Propellants Explo Pyrotec

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“…Hitherto, extensive research has been done on the material formular to enhance the chemical energy release ability [28][29][30][31][32], or improve the density to increase the strength and kinetic energy of the PTFE/Al-based reactive materials [33][34][35][36][37]. The energy release behavior, meanwhile, is also a research focus that has recently received considerable attention, the reaction efficiencies showing a significant positive correlation with the impact velocity [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

An approach to distinguish chemical and kinetic energy of reactive materials: PTFE/LiF as an inert substitute to PTFE/Al

Zhou,

Zhao,

Wang

et al. 2024

Propellants Explo Pyrotec

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To distinguish between the kinetic and chemical contributions in the impact of PTFE/Al, this study explores the feasibility of introducing an inert substitute for PTFE/Al by substituting aluminum (Al) with inert materials. Three specimens were fabricated through a process involving mixing, compression, and sintering of raw materials The mechanical properties of these specimens were assessed. Dynamic fragmentation tests of PTFE/Al and PTFE/LiF specimens were performed. These results further substantiate the potential of PTFE/LiF as an inert alternative to PTFE/Al, the two materials exhibit comparable fragmentation distribution characteristics. A preliminary exploration of the energy release in both materials was conducted via vented chamber calorimetry tests. The findings reveal that, at an impact velocity of roughly 650 m/s, only 66.9 % of the materials were deposited into the chamber, with a mere 17.8 % being initiated, about 88.9 % of the total deposited energy results from the chemical reaction energy within the PTFE/Al materials. Importantly, this method demonstrates promise for further application in energy release analysis experiments for various PTFE/Al‐based reactive materials. These findings are beneficial for evaluating the energy release characteristics of reactive fragments on typical targets and lay the foundation for refining energy release models of such materials in future research.

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Dynamic Constitutive Model of Tungsten‐Whisker‐Reinforced Aluminum/Polytetrafluoroethylene Composite Material and Quantitative Determination of Impact Reaction Release Energy in Vacuum Environment

Tang,

Deng,

Wang

et al. 2024

Adv Eng Mater

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To meet the strength requirements of aluminum/polytetrafluoroethylene (Al/PTFE) in practical applications, tungsten (W) whisker is added into the traditional formula Al/PTFE (26.5%/73.5%) to improve the dynamic compressive strength of the reactive material. Mechanical properties of reactive material specimens prepared by sintering are tested. In the results, it is shown that the dynamic compressive strength of Al/PTFE‐reactive material reinforced by tungsten whisker with volume fraction of 13.1% can reach 141 MPa at strain rate of 1800 s−1. The constitutive model of dynamic compression for tungsten‐whisker‐enhanced Al/PTFE‐reactive material is constructed, and the results are basically consistent with the experimental results. The quantitative impact energy release of reactive material specimens under vacuum environment are performed by using the two‐stage light gas gun loading system, and the quantitative impact release energies of Al/PTFE‐reactive material reinforced by tungsten whisker under different whisker percentage content and diameter are obtained.

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Impact-Initiation Sensitivity of High-Temperature PTFE-Al-W Reactive Materials

Cited by 6 publications

References 23 publications

Effects of Glycerol Tribenzoate on the Mechanical Properties and Reaction Characteristics of Al/THV Reactive Materials Prepared by Extrusion‐Injection Molding

Effects of Glycerol Tribenzoate on the Mechanical Properties and Reaction Characteristics of Al/THV Reactive Materials Prepared by Extrusion‐Injection Molding

An approach to distinguish chemical and kinetic energy of reactive materials: PTFE/LiF as an inert substitute to PTFE/Al

Dynamic Constitutive Model of Tungsten‐Whisker‐Reinforced Aluminum/Polytetrafluoroethylene Composite Material and Quantitative Determination of Impact Reaction Release Energy in Vacuum Environment

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