Mechanistic Approach for Simulating Hot-Spot Formations and Detonation in Polymer-Bonded Explosives

Akiki, Michel; Gallagher, Timothy P.; Menon, Suresh

doi:10.2514/1.j054898

Cited by 19 publications

(17 citation statements)

References 47 publications

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“…85–97 wt%) and a polymer as the matrix. For PBXs, it is widely accepted the detonation, safety, mechanical, environmental adaptation and storage performances are the most important characteristics as concerned for their application . Among them, the mechanical performance, including the mechanical strength, modulus and creep resistance, has attracted great attentions because it plays a key role to maintain the structural strength of explosive charges, facilitating the safety, reliability and long storage performances .…”

Section: Introductionmentioning

confidence: 99%

Effects of Crystal Quality and Morphology on the Mechanical Performance of LLM‐105 Based PBXs

Yang

Lin

Gong

et al. 2019

Propellants Explo Pyrotec

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Mechanical performance is significant for the application of pressed polymer bonded explosives (PBXs) materials. In this research, several types of 2,6‐diamino‐3,5‐dinitropyrazine‐1‐oxide (LLM‐105) were selected to study the effects of crystal quality and morphology on the mechanical performance of LLM‐105 based PBXs. The surface bonding status of the LLM‐105 crystal and molding powder was characterized by scanning electron microscopy (SEM) and contact angle analysis, and the moldability was evaluated by determining the relative density of pressed cylinders of corresponding PBXs. Besides, static and dynamic mechanical properties were studied and compared, presenting the compressive, tensile and creep curves. For LLM‐105 based PBXs, spherical morphology and rough surface could result improved mechanical strength and creep resistance, facilitating the structural and dimensional stability of charges. In this case, it can bring benefits for their reliability and safety performances during application.

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Section: Introductionmentioning

confidence: 99%

Effects of Crystal Quality and Morphology on the Mechanical Performance of LLM‐105 Based PBXs

Yang

Lin

Gong

et al. 2019

Propellants Explo Pyrotec

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“…It has been observed in experiments that the sensitivity of the PBX tends to increase with higher porosity values. 59 As a result, porosity could be a critical variable in the thermo-mechanical behavior of PBS samples.…”

Section: Resultsmentioning

confidence: 99%

“…These voids are regions where temperature localization could form under mechanical insults. 59 Curing under pressure minimizes this problem and produces samples with more consistent properties.…”

Section: Porositymentioning

confidence: 99%

Mechanical response of carbon nanotube reinforced particulate composites with implications for polymer bonded explosives

Iglesias

Rowe

Fernandez

et al. 2021

Journal of Composite Materials

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Modern polymer bonded explosives (PBX) are often characterized by a sensitive response to external thermomechanical insult that in some cases lead to accidental detonation. Current strategies for desensitizing PBXs come at the expense of a significant reduction in performance. A possible method for desensitizing PBX without adverse performance effects is the multifunctional tailoring of mechanical properties through strategic incorporation of multi-walled carbon nanotubes (MWCNTs) directly into the binder phase. In this work, a fabrication method is presented that produces polymer bonded simulants (PBS) of PBX that incorporate MWCNTs into the binder phase, hydroxyl-terminated polybutadiene (HTPB). These materials were characterized via microscopy and unconfined quasi-static compression testing to determine the effects of MWCNTs. Quasi-static compression showed evidence of a MWCNT induced structural skeleton effect that provided the binder with an increased strength, load transfer, and a greater ability to resist strain localizations prior to failure. These enhancements demonstrate the potential of using MWCNTs to enhance energetic materials.

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“…The governing equations are accompanied by an equation of state (P κ ) and material properties for each phase. For demonstration, stiffened gas (SG, includes parameters p κ 0 and γ κ ) [28], calorically perfect gas (CPG, has parameter γ κ ), thermally perfect gas (TPG, requires property curve-fits for individual species), and Mie-Grüneisen (MG, requires properties for individual species) [62] EOS are used in this work. These and the corresponding parameters are welldescribed in the available literature, and their forms are not repeated here for brevity.…”

Section: Materials Propertiesmentioning

confidence: 99%

“…Next, to demonstrate the ability of this method to handle arbitrary EOS, the Al that was previously modeled using SG is now replaced with HMX, which is modeled using an MG EOS with the same parameters as used in an earlier work [62]. Unfortunately, an analytical solution to compare is not available here, but the obtained results are shown in Fig.…”

Section: Shock Interaction With Materials Interfacementioning

confidence: 99%

A seven-equation diffused interface method for resolved multiphase flows

Panchal¹,

Bryngelson²,

Menon³

2022

Preprint

Self Cite

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The seven-equation model is a compressible multiphase formulation that allows for phasic velocity and pressure disequilibrium. These equations are solved using a diffused interface method that models resolved multiphase flows. Novel extensions are proposed for including the effects of surface tension, viscosity, multi-species, and reactions. The allowed non-equilibrium of pressure in the seven-equation model provides numerical stability in strong shocks and allows for arbitrary and independent equations of states. A discrete equations method (DEM) models the fluxes. We show that even though stiff pressure-and velocity-relaxation solvers have been used, they are not needed for the DEM because the non-conservative fluxes are accurately modeled. An interface compression scheme controls the numerical diffusion of the interface, and its effects on the solution are discussed. Test cases are used to validate the computational method and demonstrate its applicability. They include multiphase shock tubes, shock propagation through a material interface, a surface-tension-driven oscillating droplet, an accelerating droplet in a viscous medium, and shock-detonation interacting with a deforming droplet. Simulation results are compared against exact solutions and experiments when possible.

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Mechanistic Approach for Simulating Hot-Spot Formations and Detonation in Polymer-Bonded Explosives

Cited by 19 publications

References 47 publications

Effects of Crystal Quality and Morphology on the Mechanical Performance of LLM‐105 Based PBXs

Effects of Crystal Quality and Morphology on the Mechanical Performance of LLM‐105 Based PBXs

Mechanical response of carbon nanotube reinforced particulate composites with implications for polymer bonded explosives

A seven-equation diffused interface method for resolved multiphase flows

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