Novel Energetic Composite Materials

Nable, Jun C.; Mercado, A.L.; Sherman, Andrew J.

doi:10.1557/proc-0896-h01-03

Cited by 10 publications

(6 citation statements)

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“…In this work, we focus on the failure properties of brittle reactive materials; these compounds, inert under normal conditions, combust rapidly under intense dynamic loading from a shock wave or high-velocity impact. [1][2][3][4] Many reactive material formulations are designed to fragment heavily under high strain-rate loading, resulting in a combustible metal debris cloud. The fragmentation properties of such materials are key to their ultimate combustion behavior, but little is currently known about their dynamic failure.…”

Section: Introductionmentioning

confidence: 99%

Impact fragmentation of aluminum reactive materials

Hooper

2012

Journal of Applied Physics

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We report the fragmentation of brittle, granular aluminum spheres following high velocity impact (0.5-2.0 km/s) on thin steel plates. These spheres, machined from isostatically pressed aluminum powder, represent a prototypical metallic reactive material. The fragments generated by the impacts are collected in a soft-catch apparatus and analyzed down to a length scale of 44 lm. With increasing velocity, there is a transition from an exponential Poisson-process fragment distribution with a characteristic length scale to a power-law behavior indicative of scale-invariance. A normalized power-law distribution with a finite size cutoff is introduced and used to analyze the number and mass distributions of the recovered fragments. At high impact velocities, the power-law behavior dominates the distribution and the power-law exponent is identical to the universal value for brittle fragmentation discussed in recent works. The length scale at which the power-law behavior decays is consistent with the idea that the length of side microbranches or damage zones from primary cracks is governing this cutoff. The transition in fragment distribution at high strain-rates also implies a significant increase in small fragments that can rapidly combust in an ambient atmosphere.

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Section: Introductionmentioning

confidence: 99%

Impact fragmentation of aluminum reactive materials

Hooper

2012

Journal of Applied Physics

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“…Fluoropolymer-based reactive composites are solid energetic materials mixed with reactive metal powder, alloy powder, or intermetallic compound in polymer powder (typically PTFE), which can release chemical energy under high dynamic load and high strain rate conditions. Due to its unique properties, reactive composites have high application value in military and civilian fields [ 1 , 2 ]. The PTFE/Al composite material is a typical reactive material, which is prepared by uniformly filling Al particles in a PTFE matrix, and cold-pressing and sintering.…”

Section: Introductionmentioning

confidence: 99%

Formation Behavior and Reaction Characteristic of a PTFE/Al Reactive Jet

Guo

Zheng

et al. 2022

Materials

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To reveal the expansion phenomenon and reaction characteristics of an aluminum particle filled polytetrafluoroethylene (PTFE/Al) reactive jet during the forming process, and to control the penetration and explosion coupling damage ability of the reactive jet, the temperature and density distribution of the reactive jet were investigated by combining numerical simulation and experimental study. Based on the platform of AUTODYN-3D code, the Smoothed Particle Hydrodynamics (SPH) algorithm was used to study the evolution behaviors and distribution regularity of the morphology, density, temperature, and velocity field during the formation process of the reactive composite jet. The reaction characteristic in the forming process was revealed by combining the distribution of the high-temperature zone in numerical simulation and the Differential Scanning Calorimeter/Thermo-Gravimetry (DSC/TG) experiment results. The results show that the distribution of the high-temperature zone of the reactive composite jet is mainly concentrated in the jet tip and the axial direction, and the reactive composite jet tip reacts first. Combining the density distribution in the numerical simulation and the pulsed X-ray experimental results, the forming behavior of the reactive composite jet was analyzed. The results show that the reactive composite jet has an obvious expansion effect, accompanied by a significant decrease in the overall density.

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Section: Introductionmentioning

confidence: 99%

“…Significantly different from traditional energeticm aterials, such as explosives and propellants,t he traditional initiationm anners (e.g. shock or flame) are not sufficient to initiate the reactivematerial projectile (hereafter called reactive projectile) as elf-sustaining reaction.H owever,w hen impacting with ah igh-strain-rate plastic deformation process, the reactive projectilei sp rovided the required energy to drive the reaction, releasing ag reat chemical energy [1][2][3][4][5].Particularly,w hen perforating the skin of the target, the reactive projectile deflagrates in the interioro ft he target and releases ag reat of chemical energy.D amage enhancement is achievedn ot only by the ignition capacity but also the behind-plate overpressure inside the target [6][7][8]. Therefore, it is crucial to investigate the behind-plate overpressure effect by reactivep rojectile for its damagea ssessment and poweri mprovement.M ock et al have conducted Ta ylor impact experiments to explore the influences of particle size and impact velocity on the time after impact for initiation,o btaining an empirical relationship of impact pressure and the time after impact for initiation [4].A mes et al have used av ented chamber to investigate the energy release characteristic of reactive projectile by ballistic impact experiments, giving the relationship between the pressure in the chamber and the chemical energy released [9, 10].M oreover,d ynamicc ompressiont ests were performed on PTFE/Al/W reactive materials to investigate the influence of tungsten content on thee nergy release and impact sensitivity [ 11].However,i nfluences of the plate thickness on the behind-plate overpressure effect haven ot been well known.…”

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confidence: 99%

Experimental Study on Behind‐Plate Overpressure Effect by Reactive Material Projectile

Geng

Zhang

et al. 2016

Propellants Explo Pyrotec

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The behind‐plate overpressure effect by a reactive material projectile with a density of 7.7 g cm−3 was investigated by ballistic impact and sealed chamber tests. The reactive projectile was launched onto the initially sealed test chamber with a 2024‐T3 aluminum cover plate with a thickness of 3 mm, 6 mm, and 10 mm, respectively. Moreover, the overpressure signals in the test chamber were recorded by a pressure sensor and a data acquisition system. The experimental results show that the behind‐plate overpressure effect is significantly influenced by plate thickness and impact velocity. For a given plate thickness, the peak overpressure in the test chamber shows an increasing trend with increase of impact velocity. However, for a given impact velocity, when impacting the 6 mm thick aluminum plate, the peak overpressure measured and the impulse delivered to chamber are higher than the values recorded for the 3 mm and 10 mm thick aluminum plates. As such, it is inferred that there is an optimum plate thickness to maximize the behind‐plate overpressure effect by reactive projectile.

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Novel Energetic Composite Materials

Cited by 10 publications

References 0 publications

Impact fragmentation of aluminum reactive materials

Impact fragmentation of aluminum reactive materials

Formation Behavior and Reaction Characteristic of a PTFE/Al Reactive Jet

Experimental Study on Behind‐Plate Overpressure Effect by Reactive Material Projectile

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