Detonation initiation of heterogeneous melt-cast high explosives

Chuzeville, Vincent; Baudin, Gérard; Lefrançois, Alexandre; Genetier, Marc; Barbarin, Y.; Jacquet, L.; Lhopitault, J. L.; Peix, J.; Boulanger, R.; Catoire, L.

doi:10.1063/1.4971467

Cited by 11 publications

(20 citation statements)

References 6 publications

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“…In the following experiments, two different melt-cast HEs were tested: TNTO and Comp B. The TNTO composition was 59.5% NTO, 39.5% TNT, and 1% wax by weight, and the Comp B was 59.5% RDX, 39.5% TNT, and 1% wax by weight [25]. Prior to the detonation test, the CR of the CFBG was measured, as well as the reflected spectra through the BraggFast system.…”

Section: Set-upmentioning

confidence: 99%

“…The experimental set-up is shown in Figure 27. The impactor and the buffer plate were chosen to ensure that the 30 • base angle of the double wedge was sufficient to avoid any back release wave [25], which could adversely affect the SDT study. The input pressure was measured with a low-impedance (13 mΩ) Manganin gauge inserted at the interface between the buffer plate and the HE wedge base.…”

Section: Set-upmentioning

confidence: 99%

“…In this second experiment, the HE material studied was an HMX/PBHT composition with 90%/10% ratio by weight [25]. The aluminum plate impactor was 88 mm in diameter and 15 mm thick.…”

Section: Hmx/pbht (90%/10%) Sdtmentioning

confidence: 99%

“…Different HE material experimental configurations were tested at CEA Gramat and at CRB (Centre de Recherche du Bouchet, ArianeGoup) over the last decade [9,12,[14][15][16][17]25]. New experimental results, with uncertainty calculations, are presented in Section 6 of this paper: bare cylinder, wedges for shock-to-detonation transitions, and sphere configurations.…”

Section: Introductionmentioning

confidence: 99%

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Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings

Barbarin

Lefrançois²,

Chuzeville³

et al. 2020

Sensors

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Dynamic measurements of shock and detonation velocities are performed using long chirped fiber Bragg gratings (CFBGs). Such thin probes, with a diameter of typically 125 µm or even 80 µm can be directly inserted into high-explosive (HE) samples or simply glued laterally. During the detonation, the width of the optical spectrum is continuously reduced by the propagation of the wave-front, which physically shortens the CFBG. The light power reflected back shows a ramp-down type signal, from which the wave-front position is obtained as a function of time, thus yielding a detonation velocity profile. A calibration procedure was developed, with the support of optical simulations, to cancel out the optical spectrum distortions from the different optical components and to determine the wavelength-position transfer function of the CFBG. The fitted slopes of the X–T diagram give steady detonation velocity values which are in very good agreement with the classical measurements obtained from discrete electrical shorting pins (ESP). The main parameters influencing the uncertainties on the steady detonation velocity value measured by CFBG are discussed. To conclude, different HE experimental configurations tested at CEA (Commissariat à l’Energie Atomique et aux Energies Alternatives) are presented: bare cylindrical sticks, wedges for shock-to-detonation transitions (SDT), spheres, a cast-cured stick around a CFBG, and a detonation wave-front profile configuration.

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Section: Set-upmentioning

confidence: 99%

Section: Set-upmentioning

confidence: 99%

“…In this second experiment, the HE material studied was an HMX/PBHT composition with 90%/10% ratio by weight [25]. The aluminum plate impactor was 88 mm in diameter and 15 mm thick.…”

Section: Hmx/pbht (90%/10%) Sdtmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings

Barbarin

Lefrançois²,

Chuzeville³

et al. 2020

Sensors

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“…All solid state reactions must be activated by external stimuli: laser, shock, isothermal or nonisothermal (low or fast, linear or nonlinear) heating. Various techniques can yield much insight into the phenomena occurring within the composites to understand the ignition or combustion mechanisms so as to improve the performances of nanoenergetic materials [9]. It is here beyond the scope of this work to describe them all and exhaustively.…”

Section: Introductionmentioning

confidence: 99%

Detailed Chemical Kinetic Models for Nanothermites Combustion

Catoire

2018

Propellants Explo Pyrotec

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Mechanical Behaviour of a NTO and RDX‐Based Melt Cast Explosive

Drouet

Hanus

Pavier³

et al. 2020

Propellants Explo Pyrotec

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Constitutive equationsThe XF explosive family from NEXTER Munitions relies on a melt cast formulation with a TNT matrix. Melt cast formulations provide a high‐volume ratio of energetic filler material to matrix. This might affect the mechanical response of the material and its damage process. Therefore, a laboratory study has been launched to improve the knowledge of the mechanical behavior of this family of energetic materials. To mimic the conditions observed by the material inside ammunition, we chose to adapt a passive confinement method to the pyrotechnic conditions of the XF‐11585. This relies on an elastic‐perfectly plastic ring that gives us access to the shear behavior for different loadings in quasi‐static regime. This setup allowed us to investigate the physical phenomena involved under both pressure and shear. Then, based on the results obtained, we built an isotropic elastic damage model. This macroscopic modeling of damage is meant to be simple but complex enough to provide an assessment of the material degradation.

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Detonation initiation of heterogeneous melt-cast high explosives

Cited by 11 publications

References 6 publications

Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings

Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings

Detailed Chemical Kinetic Models for Nanothermites Combustion

Mechanical Behaviour of a NTO and RDX‐Based Melt Cast Explosive

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