Mechanical Characteristics and Microstructural Changes of Solids Under Shock Compression

Бацанов, С. С.

doi:10.1007/978-1-4757-3969-5_3

Cited by 5 publications

(5 citation statements)

References 89 publications

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“…4 is a calculated band of shock states. These Hugoniot states were calculated using the ε − α model 15 29 , and the mixture theory proposed by Batsanov 30 . The range of states was generated by varying the initial bulk sample density within the error bounds of the balance used to weigh-out the powder component mass (±0.01 g).…”

Section: Resultsmentioning

confidence: 99%

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

Rutherford

Chapman

Derrick

et al. 2017

Sci Rep

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Chondritic meteorites are fragments of asteroids, the building blocks of planets, that retain a record of primordial processes. Important in their early evolution was impact-driven lithification, where a porous mixture of millimetre-scale chondrule inclusions and sub-micrometre dust was compacted into rock. In this Article, the shock compression of analogue precursor chondrite material was probed using state of the art dynamic X-ray radiography. Spatially-resolved shock and particle velocities, and shock front thicknesses were extracted directly from the radiographs, representing a greatly enhanced scope of data than could be measured in surface-based studies. A statistical interpretation of the measured velocities showed that mean values were in good agreement with those predicted using continuum-level modelling and mixture theory. However, the distribution and evolution of wave velocities and wavefront thicknesses were observed to be intimately linked to the mesoscopic structure of the sample. This Article provides the first detailed experimental insight into the distribution of extreme states within a shocked powder mixture, and represents the first mesoscopic validation of leading theories concerning the variation in extreme pressure-temperature states during the formation of primordial planetary bodies.

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Section: Resultsmentioning

confidence: 99%

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

Rutherford

Chapman

Derrick

et al. 2017

Sci Rep

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“…It seems reasonable to hypothesize that such shearing events would involve localized grain refinement [42], especially in light of nearly saturated dislocation densities near the interfaces. This notion is similar to the idea of Batsanov [43], which involves shock-induced particle fracturing and interpenetration in an environment of high strain gradients and high defect concentrations. To explore this idea, we consider a model of shock-induced crystal refinement that was proposed by Horie and Yano [42].…”

Section: Reduction Of Mixing Length Scale By Particle Fragmentationmentioning

confidence: 55%

The deformation and mixing of several Ni/Al powders under shock wave loading: effects of initial configuration

Austin¹

2014

Modelling Simul. Mater. Sci. Eng.

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The shock wave initiation of ultra-fast chemical reactions in inorganic powder mixtures requires the reactants to be blended within the shock front or shortly behind it. As such, the details of particle deformation are crucial to understanding the sequence of events leading up to the shock initiation of these systems. It is known that the initial configuration of a powder (i.e. the mixture composition and particle morphology) can have a significant effect on the degree of mixing that is achieved under shock wave loading. However, it is difficult to fully resolve this mixing behaviour in shock compression experiments due to the time and length scales involved. In this work, the shock wave deformation and mixing of six distinct Ni/Al powders are studied at the particle level using finite element simulation. Attention is focused on the Ni/Al interfaces that are formed since overall mixture reactivity depends on the specific amount of reactant interfacial area and on conditions induced at those interfaces. The analysis reveals (i) a rank ordering of the powders based on reactant interfacial area formation, (ii) a scaling relation for the rate of Ni/Al interface production and (iii) the distributed nature of Ni/Al interface temperature and dislocation density over a range of shock stress. Finally, it is shown that particle velocity differentials tend to develop across Ni/Al interfaces when the compacted powders are reshocked by reflection waves. The velocity differentials stem from the heterogeneity of the aggregates and are hypothesized to drive fragmentation processes that enable ultra-fast reactions on a sub-microsecond time scale.

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“…The KEA method was proposed by Ref. 8. The KEA is built on the precondition that the mixture is under pressure equilibrium and the equilibrium velocity of the mixture can be determined by averaging the velocity of the individual constituent with the mixture rule.…”

Section: Kinetic Energy Average Methodsmentioning

confidence: 99%

Average models for calculating the shock equation of state of alloy and mixture

Young¹,

Liu²,

Leng³

et al. 2019

Jpn. J. Appl. Phys.

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Accurate models for calculating the Hugoniot of a mixture and alloy are necessary in shock wave experiments. An average model modified from the isothermal averaging method is proposed to determine the shock equation of state for more than two-phase mixtures and alloys. Additionally, different average models are compared with the available experimental data, and the results show that the predicted shock Hugoniot by the modified isothermal averaging method has good agreement with the experimental data. The modified isothermal averaging method is completely flexible allowing for multi-component alloys and mixtures.

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Mechanical Characteristics and Microstructural Changes of Solids Under Shock Compression

Cited by 5 publications

References 89 publications

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

The deformation and mixing of several Ni/Al powders under shock wave loading: effects of initial configuration

Average models for calculating the shock equation of state of alloy and mixture

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