Prediction of shock response of pyrotechnic mixtures from thermal analysis

Lee, I.; Finnegan, Stephen

doi:10.1007/bf01979201

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…18,19 In samples of KClO 4 =Mg-Al alloy=Calcium resinate, shock pressure was found to attenuate in unreacting samples and strengthen in reacting samples. 15 Velocity interferometry on shock initiated TiH 0.65 þKClO 4 showed essentially no evidence of reaction in the first microsecond, but a very slight increase in material velocity was observed after 2-3 ls. 20 On the other hand, no evidence of reactions in pressure and material velocity profiles was seen for an impact-sensitive mixture of aluminum and potassium perchlorate.…”

Section: B Pressure and Materials Velocitymentioning

confidence: 96%

“…Nevertheless the evidence gathered using this technique suggests that the bulk of reactions occur via a burning process with the mechanical action of the shock being responsible only for initiation of the reactions in small zones (or hot spots). In certain situations, a correlation between the threshold shock energy and autoignition enthalpy was observed, [13][14][15] suggesting that temperature plays a key role in reaction initiation.…”

Section: A Sample Recoverymentioning

confidence: 99%

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In-situ measurements of the onset of bulk exothermicity in shock initiation of reactive powder mixtures

Jetté

Higgins

Goroshin

et al. 2011

Journal of Applied Physics

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Anisotropic shock sensitivity for β-octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine energetic material under compressive-shear loading from ReaxFF-lg reactive dynamics simulations J. Appl. Phys. 111, 124904 (2012) Band-filling dependence of thermoelectric properties in B20-type CoGe Appl. Phys. Lett. 100, 093902 (2012) Scaling of light emission from detonating bare Composition B, 2,4,6-trinitrotoluene [C7H5(NO2)3], and PE4 plastic explosive charges J. Appl. Phys. 110, 084905 (2011) Mechano-chemical pathways to H2O and CO2 splitting Appl. Phys. Lett. 99, 154105 (2011) Dissociation of methane under high pressure

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Section: B Pressure and Materials Velocitymentioning

confidence: 96%

Section: A Sample Recoverymentioning

confidence: 99%

In-situ measurements of the onset of bulk exothermicity in shock initiation of reactive powder mixtures

Jetté

Higgins

Goroshin

et al. 2011

Journal of Applied Physics

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“…Krueger et al [8] also noticed that in shocked Ni + Si pow-ders with various initial densities, the shock initiation energy threshold could be related to the enthalpy at the reaction onset temperature. In other mixtures, however, the threshold shock energy did not correlate with either the enthalpy at the reaction onset temperature [9,10], or with the thermal ignition temperature of 12.7 mm diameter pellets heated in a furnace [11]. Additional data on critical shock energy and enthalpy at the reaction onset temperature for a wide assortment of reactive compositions could help clarify this issue.…”

Section: Introductionmentioning

confidence: 99%

On the Relationship between Shock and Thermal Initiating Conditions for Various Reactive Powder Mixtures

Jetté

Goroshin

Frost

et al. 2012

Propellants Explo Pyrotec

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The critical conditions for initiation of reaction by shock loading in various compositions that produce little or no gas upon reaction were investigated. Shock recovery experiments using Mn+S were first carried out in two different apparatus geometries and for two different initial sample densities. In one geometry, the sample was subjected to a planar shock followed by interactions with the confining walls. In the other geometry, a curved shock free of wall interactions was delivered to the sample. The low‐density (55 % TMD) Mn+S was found to be significantly more sensitive to the curved shock than to the planar shock with wall interactions. For high‐density (90 % TMD) Mn+S samples however, shock sensitivity was the same in both apparatuses. Next, the reaction onset temperature and the critical initiating shock pressure were determined for a number of powder mixtures using DTA and shock recovery (in the geometry producing planar shocks with interactions with the confinement walls), respectively. For the majority of the mixtures tested, the minimum shock energy required to cause the entire sample mixture to react was found to be much less than the enthalpy of the sample at its reaction onset temperature, with no significant correlation between these two parameters. The process of arrested ball‐milling, which results in a reduction of the reaction onset temperature of a mixture, may lead to an increase in shock sensitivity. Additionally, thermal sensitivity in the particular mixtures considered was not increased when they were first shock‐compacted by sub‐critical shocks.

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“…Many districts in China benefit a lot from this industry. However, frequent accidents led by fireworks have set alarm for us and urges us to develop safer fireworks with equivalent effects [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Influences of Bulking and Porous Structure on Barium Nitrate as Pyrotechnic Oxidants

Zhang

Chen

Feng

et al. 2012

AMR

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An experimental investigation was carried out to explore the major physical and chemical properties of expanded barium nitrate. Expanded barium nitrate with porous structure was made. The method is as follows: moderately evaporate the solution of barium nitrate and inorganic vesicant; heat the crystallized mixture to decompose the inorganic vesicants. The inorganic vesicants are potassium carbonate, sodium carbonate, ammonium carbonate, ammonium oxalate, potassium acetate, ammonium acetate and ammonium perchlorate. The SEM shows that the modified barium nitrate with potassium carbonate has obvious porous structure. The bulk density of the modified barium nitrate with ammonium perchlorate decreases by 14.6% and the hygroscopicity of that with ammonium oxalate is only 0.06%. The one with sodium carbonate decomposes at 300°C. The safety test shows that both the impact sensitivity and friction sensitivity are 0%.

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Prediction of shock response of pyrotechnic mixtures from thermal analysis

Cited by 7 publications

References 2 publications

In-situ measurements of the onset of bulk exothermicity in shock initiation of reactive powder mixtures

In-situ measurements of the onset of bulk exothermicity in shock initiation of reactive powder mixtures

On the Relationship between Shock and Thermal Initiating Conditions for Various Reactive Powder Mixtures

Influences of Bulking and Porous Structure on Barium Nitrate as Pyrotechnic Oxidants

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