Reversal of particle size/shock sensitivity relationship at small particle size for pressed heterogeneous explosives under sustained shock loading

Spear, Robert J.; Nanut, Victor

doi:10.1080/07370658908012561

Cited by 11 publications

(5 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For sustained shocks, it is found that, at constant material density, the smaller particles are more sensitive than larger under SDT conditions down to minimum size when the sensitivity decreases again. An investigation of RDX powder at 90% of TMD showed that in order of sensitivity 21 μm powder was more sensitive than 100, 138 and 250 μm, but that 3.9 μm powder was slightly less sensitive than 21 μm [36]. As noted before, this is probably a result of the efficacy of the hot spot forming imperfections being related to the particle size of the pressed powder.…”

Section: (B) the Sdt Processmentioning

confidence: 79%

A review of the mechanism by which exploding bridge-wire detonators function

Rae

Dickson

2019

Proc. R. Soc. A.

View full text Add to dashboard Cite

An introduction to exploding bridge-wire (EBW) detonators is given followed by an extensive critical review of open source literature pertaining to these devices. The aim is to better establish the mechanism of operation. Some authors state that the key mechanism is shock-to-detonation while others maintain it is more thermal in nature, or a complex combination of both. In addition to EBW detonators, arc detonators and direct optical initiation detonators are also reviewed, and it is demonstrated that in this manner the usually coupled effects from both shock and deflagration can be somewhat decoupled. As a result, it is hypothesized that the mechanism of operation in all three detonators is in fact the same: the formation of a hot plasma with a power of ≈1 MW and emission in the ultraviolet drives a thermal explosion process.

show abstract

Section: (B) the Sdt Processmentioning

confidence: 79%

A review of the mechanism by which exploding bridge-wire detonators function

Rae

Dickson

2019

Proc. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…The non-monotonic sensitivity with median micrograin size of 10%-porous RDX was also shown. 74 This non-monotonic behavior was theoretically conrmed for HMX, TATB and TNT. 75 At a given porosity, the voids must be sufficiently small, depending on the considered explosive, for the sensitivity to decrease and ignition to eventually fail.…”

Section: B Experimental Uncertainty and Factors Affecting The Relatio...mentioning

confidence: 83%

Can a shock-induced phonon up-pumping model relate to impact sensitivity of molecular crystals, polymorphs and cocrystals?

Bidault

Chaudhuri

2022

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…It is well known that the specific interfacial area is an important parameter determining the ignition behavior of PBXs. 38,39 To properly delineate the statistical trends in behavior, more systematically constructed microstructure sample sets must be developed.…”

Section: Quantification and Effects Of Variations Of Microstructurmentioning

confidence: 99%

“…A similar effect was also observed in pressed RDX by Spear and Nanut. 39 Khasainov et al 38 suggested that this shock sensitivity reversal in PBXs is due to a change in critical hotspot size resulting from differences in the specific interface area of the granules. The dependence of ignition sensitivity on input stress is a complex issue which involves two aspects: (1) the formation of critical hotspots and (2) the propagation of reaction in hotspots and associated thermal runaway.…”

Section: K Axial Stress and Median Time To Criticality T 50mentioning

confidence: 99%

Prediction of probabilistic ignition behavior of polymer-bonded explosives from microstructural stochasticity

Barua

Kim

Horie

et al. 2013

Journal of Applied Physics

View full text Add to dashboard Cite

Random variations in constituent properties, constituent distribution, microstructural morphology, and loading cause the ignition of explosives to be inherently stochastic. An approach is developed to computationally predict and quantify the stochasticity of the ignition process in polymer-bonded explosives (PBXs) under impact loading. The method, the computational equivalent of carrying out multiple experiments under the same conditions, involves subjecting sets of statistically similar microstructure samples to identical overall loading and characterizing the statistical distribution of the ignition response of the samples. Specific quantities predicted based on basic material properties and microstructure attributes include the critical time to ignition at given load intensity and the critical impact velocity below which no ignition occurs. The analyses carried out focus on the influence of random microstructure geometry variations on the critical time to ignition at given load intensity and the critical impact velocity below which no ignition occurs. Results show that the probability distribution of the time to criticality (t c) follows the Weibull distribution. This probability distribution is quantified as a function of microstructural attributes including grain volume fraction, grain size, specific binder-grain interface area, and the stochastic variations of these attributes. The relations reveal that the specific binder-grain interface area and its stochastic variation have the most influence on the critical time to ignition and the critical impact velocity below which no ignition is observed. For a PBX with 95% octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine content, the computationally predicted minimum impact velocity for ignition is in the range of 54-63 ms À1 depending on microstructure. This range is comparable to values measured experimentally for PBX9501 (53 ms À1 by Chidester et al., "Low amplitude impact testing and analysis of pristine and aged solid high explosives," in Eleventh (International) Symposium on Detonation, ONR (1998), 33300. 60-84 ms À1 by Gruau et al., "Ignition of a confined high explosive under low velocity impact," Int. J. Impact Eng. 36, 537-550 (2009)). V

show abstract

Reversal of particle size/shock sensitivity relationship at small particle size for pressed heterogeneous explosives under sustained shock loading

Cited by 11 publications

References 18 publications

A review of the mechanism by which exploding bridge-wire detonators function

A review of the mechanism by which exploding bridge-wire detonators function

Can a shock-induced phonon up-pumping model relate to impact sensitivity of molecular crystals, polymorphs and cocrystals?

Prediction of probabilistic ignition behavior of polymer-bonded explosives from microstructural stochasticity

Contact Info

Product

Resources

About