Detonation in an aluminum-Teflon mixture

Dolgoborodov, A. Yu.; Makhov, M. N.; Колбанев, И. В.; Стрелецкий, А. Н.; Фортов, В. Е.

doi:10.1134/1.1944069

Cited by 93 publications

(52 citation statements)

References 1 publication

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“…While initially the main cloud and dark ring have similar slopes, the dark ring continues to progress at a relatively constant velocity of 975 m/s, whereas the main cloud slows down to approximately 366 m/s. These values are similar to the deflagration velocities found by Dolgoborodov et al [11] for confined linear burn tests conducted on aluminum ? Teflon mixtures.…”

Section: Resultssupporting

confidence: 89%

“…This would not be unreasonable given the deflagration speeds of 700? m/s for Al/PTFE mixtures [11]. In these tests the mass of the copper projectile adds inertia and kinetic energy and therefore greater deformation at these lower impact velocities that contributes to the reaction.…”

Section: Modeling Results and Discussionmentioning

confidence: 98%

“…For modeling purposes we chose to use PTFE as a representative matrix material since limited strength data exists for the fluorinated acrylate matrix and AlFA composites. While it would be ideal to have constitutive models describing the behavior of the fluorinated acrylate (FA) used in this work, the quasi-static strengths for PTFE (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) [14,16] and FA (\15 MPa) [8] for a strain rate of $ 0.001 s À1 are fairly close. The acrylate-containing polymer, PMMA, was also considered.…”

Section: Modeling Setupmentioning

confidence: 91%

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Impact Initiation of Reactive Aluminized Fluorinated Acrylic Nanocomposites

White

Crouse

Spowart

et al. 2016

J. dynamic behavior mater.

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The initiation of aluminized fluorinated acrylic (AlFA) nanocomposites during modified Taylor impact tests was investigated. Samples were impacted against a steel or sapphire anvil at a nominal velocity of 150 m/s. A framing camera was used to capture head-on and sideprofile impact images for the sapphire window and steel plate rigid anvils, respectively. Correlations were drawn between both experimental setups to determine the initiation locations and reaction times. Reactions were found to initiate at an intermediate radius on the impact face of the pellet at a time near full compaction. From simulations, the highest strains and temperatures were found at radii similar to those observed in experiments at the time of ignition. Off-normal impacts produced higher localized straining and temperatures on one-half of the pellet. The copper projectile, used for delivery, was revealed to aid in a shear assisted reaction by helping to drive the pellet material outward as the projectile deformed radially.

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Section: Resultssupporting

confidence: 89%

Section: Modeling Results and Discussionmentioning

confidence: 98%

Section: Modeling Setupmentioning

confidence: 91%

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Impact Initiation of Reactive Aluminized Fluorinated Acrylic Nanocomposites

White

Crouse

Spowart

et al. 2016

J. dynamic behavior mater.

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“…Dolgovorodov et al [21] studied Teflon-based mechanoactivated energetic composites such as AlTeflon. With spherical Al particles of 4 µm in diameter, they measured burning velocities between 300 and 400 m/s.…”

Section: Introductionmentioning

confidence: 99%

Fast reactions with nano- and micrometer aluminum: A study on oxidation versus fluorination

Watson

Pantoya

Levitas

2008

Combustion and Flame

168

105

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“…Mixtures containing polytetrafluoroethylene (PTFE) and aluminum (Al) are known to be energetic under dynamic and/or thermal loading [1][2][3][4][5][6] . They are similar in composition to thermites 7 , a subgroup of the class of pyrotechnics, and are formulated to generate a large quantity of heat during the reaction driven by mechanical deformation in the bulk material.…”

mentioning

confidence: 99%

The influence of metallic particle size on the mechanical properties of polytetraflouroethylene-Al–W powder composites

Cai

Nesterenko

Vecchio

et al. 2008

Applied Physics Letters

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The dynamic mechanical properties of reactive materials (e.g., high density mixtures of polytetraflouroethylene (PTFE), aluminum (Al) and tungsten (W) powders) can be tailored by changing the morphology of the particles and porosity. Cold isostatically pressed PTFE-Al-W powder composites with fine metallic particles and a higher porosity exhibited higher ultimate compressive strength than less porous composites having equivalent mass ratios with coarse W particles. The mesoscale force chains between the fine metallic particles are responsible for this unusual phenomenon. We observed macrocracks below the critical failure strain for the matrix and a competition between densification and fracture in some porous samples in dynamic tests. 2Mixtures containing polytetrafluoroethylene (PTFE) and aluminum (Al) are known to be energetic under dynamic and/or thermal loading [1][2][3][4][5][6] . They are similar in composition to thermites 7 , a subgroup of the class of pyrotechnics, and are formulated to generate a large quantity of heat during the reaction driven by mechanical deformation in the bulk material. This paper describes the mechanical behavior of the PTFE-Al-W composites with varying W particle size and porosity. Varying cold isostatic pressing conditions introduces different porosities and component configurations within the samples. The quasi-static and dynamic ultimate compressive strength of the composites were measured to identify influence of their mesostructure on mechanical properties and fracture. The unusual phenomenon of increased strength of porous composites with reducing size of metallic particles was observed. A two-dimensional Eulerian hydrocode is used to numerically model the composite systems to explain experimental phenomenon.Tailoring the mechanical and chemical properties of reactive materials is important for various applications. For example, varying particle size and morphology in pressed explosives (HNS) 8 or layer thicknesses in laminate 9 can be used for tailoring of shocksensitivity and the rate of energy release. The stress/force chain formation in granular energetic materials can be related to ignition sites within composite energetic materials under a compressive load 10 . Bardenhagen, Brackbill 11 and Roessig, Foster, and Bardenhagen 12 examined the localized stress propagation due to force chains and effects of binder in two dimensional particle bed under static and dynamic loading.Cold Isostatic Pressing (CIPing) was used to prepare specimens from a mixture of 17.5 wt% PTFE, 5.5 wt% Al, and 77 wt% W powders with different porosities. The initial powders had the following average sizes: Al: 2 μm (Valimet H-2); coarse W powder: < 44 μm (Teledyne, -325 mesh) and fine W powder with particle sizes < 1μm 3 (Alfa-Aesar); PTFE: 100 nm (DuPont, PTFE 9002-84-0, type MP 1500J). The mixed powders were ball milled in the SPEX 800 mill for 2-10 minutes using alumina balls with a 1:5 mass ratio of balls to powder to break down the agglomeration of powders. Table I shows the density of vari...

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Detonation in an aluminum-Teflon mixture

Cited by 93 publications

References 1 publication

Impact Initiation of Reactive Aluminized Fluorinated Acrylic Nanocomposites

Impact Initiation of Reactive Aluminized Fluorinated Acrylic Nanocomposites

Fast reactions with nano- and micrometer aluminum: A study on oxidation versus fluorination

The influence of metallic particle size on the mechanical properties of polytetraflouroethylene-Al–W powder composites

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