The development of the aluminum sulfide synthesis reaction on explosive loading of a cylindrical ampoule

Зелепугин, С. А.; Ivanova, Oksana; Yunoshev, A. S.; Сильвестров, В. В.

doi:10.1134/s0012501610100052

Cited by 8 publications

(7 citation statements)

References 1 publication

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“…In the axial direction, the action of the explosive began at the initial time t=0, and in the radial direction, as the detonation front moved from top to bottom. The detonation velocity was set to D = 3.3 km/s taken from the experimental data [13]. The pressure pulse at the upper end of the ampoule was varied in the computations to study the effect of this parameter on the initiation and development of the solid-phase synthesis of the thermite mixture.…”

Section: Formulation Of the Problemmentioning

confidence: 99%

Numerical simulation of solid-phase chemical transformations in thermite mixtures under shock-wave loading

Ivanova

Cherepanov

Зелепугин

2022

J. Phys.: Conf. Ser.

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Shock-wave loading of a steel cylindrical ampoule that contained an aluminum-copper oxide(Al/CuO) thermite mixture is simulated in three-dimensional space using the SPH method.The chemical reaction starts after the performance of the criterion on temperature or pressure.Thechemical reaction equations are integrated using the first-order Euler method.The elastic-plastic flow is calculated using the variational formulation.The numerical study of solid-phase chemical transformations in the Al/CuO thermite mixture under shock-wave loading shows that the initiation of reactions in the shock wave,further development,and completion depends significantly on the amplitude and duration of the shock wave.Sub-critical pressure pulse can lead to an incomplete reaction or incompletely compacted final product.

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Section: Formulation Of the Problemmentioning

confidence: 99%

Numerical simulation of solid-phase chemical transformations in thermite mixtures under shock-wave loading

Ivanova

Cherepanov

Зелепугин

2022

J. Phys.: Conf. Ser.

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“…, P si is the pressure in the solid (undamaged) part of the i-th component in the mixture, V 1i , V 2i , P ki , K fi are the experimentally determined constants of the material. Pressure in the undamaged component of the mixture is a function of specific volume and internal energy, and over the entire range of loading conditions, it is determined by the Mie-Grüneisen equation of state according to the formula [9]: Studying the deformation of multicomponent media, it is necessary to take into account the state and response of each component, as well as, in contrast to a homogeneous mixture, not only the displacement of the external boundaries of the selected volume, but also the displacement of components in the selected volume of the mixture. Here, we consider the equal pressures of the components to be a condition for joint deformation of components during the interaction in the mixture, which determines volume concentrations of the components [9]:…”

Section: Formulation Of the Problemmentioning

confidence: 99%

Numerical Simulation of Inert Solid-Phase Three- Component Mixtures Subjected to Explosive Compaction

Зелепугин¹,

Ivanova²,

Yunoshev³

2018

Proceedings of the International Conference "Actual Issues of Mechanical Engineering" (AIME 2018)

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The article considers the axisymmetric problem concerning the explosive compaction of a mixture from aluminum, sulfur and carbon placed into a cylindrical steel ampoule. The inert substance (graphite) is added to the mixture to avoid the reaction between aluminum and sulfur. The numerical computations have demonstrated that the thickness of the explosive layer essentially influences on the final result of explosive compaction. Insufficient thickness of explosives, as well as the excessive thickness may be a reason for an incompletely compacted final product or lead to the formation of cracks or damage.

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“…Mixture of aluminum powder ASD4 grade PAP2 (flakes with sizes 20 μm, thickness several microns) and sulfur powder [11,13] was used as a loading material for experiments. The powders were mixed in a planetary mill AGO-2U in mass proportion 35/65 (Al/S), which corresponds to stoichiometry of aluminum sulfide formation Al 2 S 3 .…”

Section: Explosive Loading Of Aluminum and Sulfur Mixture (Al/s)mentioning

confidence: 99%

“…Equation system to describe unstable adiabatic motion of each component in some fixed in space volume of a solid compressible mixture V, limited by surface S, which takes into account appropriate exchange of mass, momentum and energy between the components inside the volume V, as well as generation and evolution of microdamages, consists of equations of continuity, motion, energy, the rate of change in the specific volume of microdamages [11][12][13][14][15][16].…”

Section: Mathematical Description Of Multicomponent Media Behaviour Amentioning

confidence: 99%

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Destruction of cylindrical ampoules containing solid phase reaction mixtures under explosive loading

Зелепугин¹,

Иванова²,

Yunoshev³

et al. 2015

LoM

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Peculiarities of solid-phase synthesis in aluminum-sulfur and aluminum-fluoroplast mixtures in cylinder ampoules under explosive loading have been studied in experiments and numerically. In experiments the chosen parameters of explosive loading were similar to those which are usually used for explosive compacting of the inert porous materials in cylinder ampoules. The results of experiments show that cylinder ampoules are destructed in explosive loading conditions when mixture used as a filler is capable of very fast exothermal reactions. To find out the reasons of ampoules destruction numeric calculations have been carried out by the method of finite elements on the base of multicomponent media. While studying the deformation of multicomponent media it is necessary to take into account the state and reaction of each component and components displacement inside a chosen released volume of the mixture. As a condition of compatible deformation of the components a pressure balance of mixture components was chosen. Synthesis reaction in the mixture was described by the phenomenological model of irreversible chemical transformations based on zero-order kinetics. Simulation of compaction of the porous mixture was carried out on the base of a kinetic model of active type, which describes the growth or collapse of the pores resulting in a permanent change of the material properties and stress relaxation. It was found that pressure is increased sharply at the bottom of the ampoule when shock wave is reflected from the bottom ampoule lid as a compressive wave which is followed by chemical transformation rate growth. High rate of heat release during reaction in a lower ampoule part resulted in gas phase formation which leads to a further pressure increase and becomes the reason of ampoules destruction.

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The development of the aluminum sulfide synthesis reaction on explosive loading of a cylindrical ampoule

Cited by 8 publications

References 1 publication

Numerical simulation of solid-phase chemical transformations in thermite mixtures under shock-wave loading

Numerical simulation of solid-phase chemical transformations in thermite mixtures under shock-wave loading

Numerical Simulation of Inert Solid-Phase Three- Component Mixtures Subjected to Explosive Compaction

Destruction of cylindrical ampoules containing solid phase reaction mixtures under explosive loading

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