Pressure measurements in chemically reacting powder mixtures with the Bauer piezoelectric polymer gauge

Graham, R. A.; Anderson, M. U.; Horie, Y.; You, S.; Holman, G. T.

doi:10.1007/bf02115887

Cited by 28 publications

(31 citation statements)

References 15 publications

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“…The formation of reaction products immediately or shortly behind the shock front influences the equilibrium shock state, the changes of which can only be verified through time-resolved measurements. [35][36][37][38][39][40] The category of slow reactions are known as "shock-assisted" reactions, which result as a consequence of the disturbed microstructure and elevated shock-generated residual temperatures. Reactions of this type are driven by atomic diffusion in the time scale of bulk temperature equilibration (tens of microseconds to milliseconds), and typically occur after the material has relaxed and the high-pressure has abated.…”

Section: Varied Reaction Responsementioning

confidence: 99%

“…A study conducted by Graham et al 36 using Bauer piezoelectric polymer gauges demonstrated a new experimental setup allowing the direct measurement of shock pressure and shock velocity. The polyvinylidene fluoride (PVDF) gauges offered a resolution of 1 ns up to a maximum pressure of 100…”

Section: Fig 18mentioning

confidence: 99%

“…Several series of experiments have been conducted to illustrate the capability of performing accurate shock-compressibility measurements on powder systems exhibiting inert and reactive behavior. 36 Stoichiometric mixtures of 3Ni+Al and 5Ti+Si, as well as rutile (TiO 2 ) powder, were pressed to initial densities of 35, 53, and 60% TMD, respectively. Specimens were contained within a Cu fixture, and impacted by a Cu flyer launched by a compressed-gas gun, sending a shock wave through the powder and diagnostic gauges.…”

Section: Fig 18mentioning

confidence: 99%

“…Reaction is only suspected in the 5Ti+3Si mixture, which exhibits an expansion to higher volumes above its supposed crush-strength of ~800 MPa (adapted from Graham et al 36 ).…”

Section: Fig 19mentioning

confidence: 99%

“…Using a similar experimental configuration as Graham et al, 36 PVDF measurements of input stress and shock velocity were obtained from impact experiments conducted in the range of 0.2-2.9 GPa. Results for the coarse and fine powder mixtures revealed a regime of densification under ~1.25 GPa, above which both mixtures followed the calculated Hugoniot of the solid mixture (Fig.…”

Section: Fig 19mentioning

confidence: 99%

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Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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The shock-compression of reactive powder mixtures can yield varied chemical behaviour with occurrence of mechanochemical reactions in the time-scale of the high-pressure state, or thermochemical reactions in the time-scale of temperature equilibration, or simply the creation of densepacked highly reactive state of material. The principal challenge has been to understand the processes that distinguish between mechanochemical (shock-induced) and thermochemical (shock-assisted) reactions, which has broad implications for the synthesis of novel metastable or non-equilibrium materials, or the design of highly configurable next-generation energetic materials. In this paper, the process of shock-compression in reactive powder mixtures and the associated role of various intrinsic and extrinsic characteristics of reactants in the triggering of ultra-fast "shock-induced" chemical reactions are discussed. Experimental techniques employing time-resolved diagnostics, and results, that identify the occurrence of shock-induced reactions are reviewed. Conceptual and numerical models used to describe the heterogeneous nature of such reactions through mesoscopic details of shock-compression are presented. Finally, a discussion of the application of recent results for the design of reactive material systems with controlled reaction initiation and energy release characteristics is provided.

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Section: Varied Reaction Responsementioning

confidence: 99%

Section: Fig 18mentioning

confidence: 99%

Section: Fig 18mentioning

confidence: 99%

“…Reaction is only suspected in the 5Ti+3Si mixture, which exhibits an expansion to higher volumes above its supposed crush-strength of ~800 MPa (adapted from Graham et al 36 ).…”

Section: Fig 19mentioning

confidence: 99%

Section: Fig 19mentioning

confidence: 99%

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Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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Dynamic Compressive Properties of Polymer Bonded Explosives under Confining Pressure

Xiao

Sun

Xiao

et al. 2017

Propellants Explo Pyrotec

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Passively confined dynamic impact experiments on PBX1314 specimens are performed by employing aluminum jackets with split Hopkinson pressure bar. The axial and radial stress history curves are measured in the experiments, and the characterizations of the behavior of PBX1314 under dynamic multi-axial loads are studied. A constitutive relation is developed for modeling the dynamic mechanical responses of PBX1314 by using the Boltzmann superposition principle with a Prony series representation.The material parameters of PBX1314 can be obtained by fitting the modulus master curve. Detailed finite element simulations of the passively confined tests are carried out to evaluate the measure accuracy of the device to the material mechanical behavior. The correctness of the constitutive relation is verified by comparison the finite element simulations with the experiments. Good agreements are obtained.

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Challenges in Understanding the Dynamic Behavior of Heterogeneous Materials

Gonzales

Thadhani

2020

Integrated Computational Materials Engineering (ICME)

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Pressure measurements in chemically reacting powder mixtures with the Bauer piezoelectric polymer gauge

Cited by 28 publications

References 15 publications

Shock compression of reactive powder mixtures

Shock compression of reactive powder mixtures

Dynamic Compressive Properties of Polymer Bonded Explosives under Confining Pressure

Challenges in Understanding the Dynamic Behavior of Heterogeneous Materials

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