Initiation of a reaction in aluminum-Teflon multilayer thin-film samples by drop-hammer impact loading

Denisaev, A. A.; Shteĭnberg, A. S.; Берлин, А. А.

doi:10.1134/s199079310803024x

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…Denisaev et al [25] studied the initiation reaction of Al/PTFE film using a drop weight test in 2008. The results indicated that Al/PTFE material is a brittle, deformed material and will break down rapidly after a certain level of pressure elastic compression, and some local initial ignition reactions occur on the shear plane.…”

Section: Introductionmentioning

confidence: 99%

Impact Energy Release Characteristics of PTFE/Al/CuO Reactive Materials Measured by a New Energy Release Testing Device

et al. 2019

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Metal/polymer reactive materials have been studied and applied in a wide range of ways in recent years. This type of material is insensitive under normal conditions but reacts violently and releases a large amount of chemical energy under high-speed impact or high strain rate loading conditions. Compared with conventional explosives, it has better mechanical properties, and its unit mass energy is several times that of TNT. In this paper, PTFE/Al/CuO reactive materials are the main research objects, and we assess the impact energy release abilities of this type of reactive material through experimental research. To this end, eight sets of material formulations are designed, and the effects of particle size, the ratio of PTFE/Al and Al/CuO materials, and sintering on the energy release ability of the reactive materials are investigated. All experiments are carried out based on a self-designed new energy release testing device. The experimental device can measure the pressure time history curve generated by the reactive materials, and the rationality of the pressure time history curve can also be verified by the displacement time curve of the piston. The results show that with an increase in the Al/CuO thermite content, the energy release rate of the reactive material clearly increases, which is attributed to the reaction threshold of Al/CuO being low and because the heat generated can promote the reaction of PTFE/Al. The energy release rate of the nano-scale reactive materials is higher than that of the micron-scale reactive materials because the reduction in particle size results in a larger specific surface area. Thus, the energy required for ignition is lower. The energy release rate of sintered reactive materials is higher than that of unsintered reactive materials, which can be explained by the interfacial area between Al particles and PTFE particles in sintered reactive materials being larger, which makes the reaction more sufficient. The self-designed energy release testing device for the reactive materials and the conclusions obtained in this paper have clear significance for guiding engineering applications.

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Section: Introductionmentioning

confidence: 99%

Impact Energy Release Characteristics of PTFE/Al/CuO Reactive Materials Measured by a New Energy Release Testing Device

et al. 2019

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“…Due to their unique performance,r eactive materials have ag reat variety of applications, and haveb een intensively investigated in the past decade [3][4][5][6][7][8][9].O ne of the most important applications is demolition. Several researches show that much greater efficiency could be achieved by reactive materials baseds haped charge liner (reactive liner), which could release chemicale nergyi nt he target.…”

Section: Introductionmentioning

confidence: 99%

“…In general, they are formed by introducing active metal powders into ap olymer binder, typically such as PTFE, and then consolidatedb yapress/sinterp rocess. Remarkably different from traditional energeticm aterials,t hey have features of high mechanical strength and sufficient insensitivity so as not to sustain ad eflagration reaction using traditional initiationt echniques, such as exploding bridge wires or flame initiation [ 1,2].A ss uch, the mechanical work of ah igh-strain-rate plastic deformationp rocess is required to providet he necessarye nergy to drivet he reaction.Due to their unique performance,r eactive materials have ag reat variety of applications, and haveb een intensively investigated in the past decade [3][4][5][6][7][8][9].O ne of the most important applications is demolition. Several researches show that much greater efficiency could be achieved by reactive materials baseds haped charge liner (reactive liner), which could release chemicale nergyi nt he target.…”

mentioning

confidence: 99%

Demolition Mechanism and Behavior of Shaped Charge with Reactive Liner

Xiao

Zhang

Wang

et al. 2016

Propellants Explo Pyrotec

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1IntroductionReactive materials areaclass ofs olid energetic materials that are formulatedt orelease energy under highly dynamic loads. In general, they are formed by introducing active metal powders into ap olymer binder, typically such as PTFE, and then consolidatedb yapress/sinterp rocess. Remarkably different from traditional energeticm aterials,t hey have features of high mechanical strength and sufficient insensitivity so as not to sustain ad eflagration reaction using traditional initiationt echniques, such as exploding bridge wires or flame initiation [ 1,2].A ss uch, the mechanical work of ah igh-strain-rate plastic deformationp rocess is required to providet he necessarye nergy to drivet he reaction.Due to their unique performance,r eactive materials have ag reat variety of applications, and haveb een intensively investigated in the past decade [3][4][5][6][7][8][9].O ne of the most important applications is demolition. Several researches show that much greater efficiency could be achieved by reactive materials baseds haped charge liner (reactive liner), which could release chemicale nergyi nt he target. The lethality of reactive liner against concrete targets was demonstrated by E. L. Baker [ 10,11]. Reactive jets were identifieda nd they were foundt oc reate much more collaterald amage than inert ones, as ar esult of the chemicale nergyr eleased inside the targets during or after the penetration process. Althought he excellent damage effects were confirmed, the demolition mechanism and behavior of this reactive material liner have not been understood well.Althoughn umericals imulationi sauseful way to reappear the penetration and blast process of reactive jets, it is difficult to find an adequate constitutivem odeling for reactive materials. For unreacted equation of state (EOS), Instron compression tests andh igh-rate split Hopkinson bar experiments were carried out to determine parameters of the Johnson-Cook model [12].Onthe other hand, atheoretical model was developed to describet he blast characteristics, and af itting method was employed to determine the corresponding parameters of reacted EOS [13].The demolition behavior depending on penetration and blast effects of ar eactivej et, is significantly influencedb y the self-delay initiationt ime and chemical energy release of reactive materials. The totalt ime of activation and selfdelay that occurs in impact-initiatedr eactivem aterials is stronglyd ependent on the dynamic loads [1].O ne step further,ah igher stress value likely leads to ar elatively shorter self-delay time. However,s ignificantlyd ifferent from an impact,w hen explosively activated, the stress imposed upon the reactivem aterials is much higher,a nd whether the highers tress will reduce the self-delay time remainsu nknown.Abstract:T he application of reactive materials on shaped charge liners has received much attention. Herein, the demolition mechanism and behavior of reactive materials based shaped chargeliner are investigated by experiment, numerical simulation, and theoretical...

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“…With the modern data capture techniques such as optical microscopy, heat sensitive films 6, high‐speed photography 7, 8 and oscilloscopic methods 9 the ignition mechanism caused by impact stimuli could be analyzed. Though these techniques had been used to measure the initiation caused by the impact stimuli, no work has been reported which examines the frictional initiation of energetic mixtures using these data capture techniques.…”

Section: Introductionmentioning

confidence: 99%

Experimental Diagnosis on Frictional Initiation of a Match Head Composition at Different Contact Materials

Sivapirakasam

Mohamed

Surianarayanan

2013

Propellants Explo Pyrotec

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The mechanism of initiation is essential to enumerate the sensitivity and evaluate the risks associated with energetic mixtures. To understand the mechanism of initiation under frictional loading, the initiation events such as initiating time and critical load have to be evaluated. This study aims to assess experimentally the initiation mechanism under frictional load by measuring the event of initiation and the critical load using a modified version of the BAM friction tester augmented with a press force sensor, an accelerometer and a photodiode arrangement. Differences in the range of diagnostics were identified for various material interactions. The data generated have the implications for assessing the safety of energetic mixtures.

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Initiation of a reaction in aluminum-Teflon multilayer thin-film samples by drop-hammer impact loading

Cited by 10 publications

References 2 publications

Impact Energy Release Characteristics of PTFE/Al/CuO Reactive Materials Measured by a New Energy Release Testing Device

Impact Energy Release Characteristics of PTFE/Al/CuO Reactive Materials Measured by a New Energy Release Testing Device

Demolition Mechanism and Behavior of Shaped Charge with Reactive Liner

Experimental Diagnosis on Frictional Initiation of a Match Head Composition at Different Contact Materials

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