An analytical approach to obtaining JWL parameters from cylinder tests

Sutton, B. D.; Ferguson, John W.; Hodgson, Alexander

doi:10.1063/1.4971490

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…Jackson [2] showed that not accounting for it would incur a 2-3% error in velocity magnitude for a cylinder test with an ideal explosive; the error magnitude generally increases for explosives with slower detonation velocities but high product energies. Full reconstruction of the cylinder motion and subsequent product isentrope determination continues to generate interest from other researchers [9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

The detonation cylinder test: Determination of full wall velocity and shape from a single velocimetry probe with an arbitrary angle

Jackson¹

2017

AIP Conference Proceedings

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Section: Introductionmentioning

confidence: 99%

The detonation cylinder test: Determination of full wall velocity and shape from a single velocimetry probe with an arbitrary angle

Jackson¹

2017

AIP Conference Proceedings

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“…For ignition and growth modelling, the equation of state of the unreacted explosives and the reaction products is required. A Jones-Wilkins-Lee (JWL) equation of state is always applied for the unreacted explosives and the reaction products as Equations 2 and 3, respectively [17][18][19]:…”

Section: Ignition and Growth Modellingmentioning

confidence: 99%

Shock Ignition and Growth of HMX-based PBXs under Different Temperature Conditions

Li¹,

Han²,

Li³

et al. 2019

Cent. Eur. J. Energ. Mater.

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The Lagrange test was conducted to investigate the shock ignition and growth of HMX-based polymer bonded explosives (PBXs) under different temperature conditions. In this study, three temperature conditions, 25 °C, 80 °C and 120 °C were used. The pressure history values along the direction of the detonation wave propagation were obtained and presented as the characteristics of the shock ignition and growth. Manganin piezoresistive pressure gauges were used to measure the pressure. The results showed that the distance to detonation was clearly reduced as the temperature was increased. A distance greater than 9 mm at 25 °C was changed to less than 3 mm at 120 °C. In order to understand this phenomenon in more detail, the Lee-Tarver ignition and growth model was employed to simulate the Lagrange test, and the simulated pressures were compared with the measured pressures. The results demonstrated that the intrinsic mechanism of the phenomenon was that the high temperature changed both the equation of state of the unreacted explosive and the chemical reaction rate. It was remarkable that the parameter R2 in the model was reduced from −0.05835 to −0.06338, and the parameter G1 in the model was increased from 1.3 to 2.12.

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“…The pressure obtained using equation 1 is shown as a function of relative volume [1] in Fig.4 a), also shown is the fit to it using the standard Jones-Wilkins-Lee (JWL) equation of state. This fit yields a Chapman-Jouguet pressure of 38.6 GPa which compares well to the accepted hydrocode value of 38.3 GPa.…”

Section: Lifmentioning

confidence: 99%

“…The results of the cylinder test can then be used to obtain the pressure-volume relationship for the expanding detonation products; this can be done directly [1][2][3][4] as is the case in this work or indirectly using hydrocodes [5,6]. In addition to the usually measured wall expansion and VoD the temperature of the detonating products was also measured.…”

Section: Introductionmentioning

confidence: 99%

The measured temperature and pressure of EDC37 detonation products

Ferguson¹,

Richley²,

Sutton³

et al. 2017

AIP Conference Proceedings

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Abstract. We present the experimentally determined temperature and pressure of the detonation products of EDC37; a HMX based conventional high explosive. These measurements were performed on a series of cylinder tests. The temperature measurements were undertaken at the end of the cylinder with optical fibres observing the bare explosive through a LiF window. The temperature of the products was measured for approximately 2 μs using single colour pyrometry, multicolour pyrometry and also using time integrated optical emission spectroscopy with the results from all three methods being broadly consistent. The peak temperature was found to be 3600 K dropping to 2400 K at the end of the measurement window. The spectroscopy was time integrated and showed that the emission spectra can be approximated using a grey body curve between 520 -800 nm with no emission or absorption lines being observed. The pressure was obtained using an analytical method which requires the velocity of the expanding cylinder wall and the velocity of detonation. The pressure drops from an initial CJ value of 38 GPa to 4 GPa after 2 μs.

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An analytical approach to obtaining JWL parameters from cylinder tests

Cited by 6 publications

References 4 publications

The detonation cylinder test: Determination of full wall velocity and shape from a single velocimetry probe with an arbitrary angle

The detonation cylinder test: Determination of full wall velocity and shape from a single velocimetry probe with an arbitrary angle

Shock Ignition and Growth of HMX-based PBXs under Different Temperature Conditions

The measured temperature and pressure of EDC37 detonation products

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