Autonomous characterization of plastic-bonded explosives

Linder, Kim Dalton; DeRego, Paul; Gomez, Antonio; Baumgart, C.W.

doi:10.1117/12.680490

Cited by 2 publications

(3 citation statements)

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“…A number of studies have focused on the development of safer but more violent explosives. [1][2][3][4][5][6] At present, polymer-bonded explosives (PBXs) are adopted widely because of their low sensitivity and high detonation energy. PBXs are similar to particle-reinforced composites, which are composed mainly of energetic crystals and matrices, including polymer binders, plasticizers, and so on.…”

Section: Introductionmentioning

confidence: 99%

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Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Qin

et al. 2011

The Journal of Strain Analysis for Engineering Design

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Polymer-bonded explosives (PBXs) are typical particulate composites of energetic crystals in a polymer matrix, which have a volume fraction of 60% to 95%. They are engineered to provide reliable performance and maximum safety envelopes through reduction of their sensitivity. There are three kinds of polymer-bonded explosive materials; namely, PBX1, PBX2, and PBX3. The last two polymer-bonded explosives were recently invented, in search of the more insensitive polymer-bonded explosive but with high detonation energy also. To investigate the dynamic response of new materials, the uniaxial compressive stress-strain behavior of the three polymer-bonded explosives was investigated as a function of temperature and strain rate. Constant and non-constant strain rate loading experiments were conducted in the use of pulse shapers. By comparing two different loads, the strain rate effect of these materials was found to depend on the instantaneous strain rate. The variations in failure stress, and failure strain with temperature, strain rate, and material composition were examined. The dependence of compressive strength on temperature and strain rate can be attributed to the Young's modulus and fracture surface energy according to Griffith criteria for fracture. The axial splitting caused by brittle fracture for most conditions was also investigated. Another failure mode of PBX2 agreed with the Mohr's failure mode criterion. All results show that PBX2 has more stable mechanical behavior and higher detonation performance.

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Section: Introductionmentioning

confidence: 99%

“…Journal of Strain Analysis 47 (2) especially in the strain rate range of 50 to 850 s 21 . The failure strains of each material are nearly insensitive to the temperature and strain rate, and can be adopted as the criterion for failure.…”

mentioning

confidence: 97%

Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Qin

et al. 2011

The Journal of Strain Analysis for Engineering Design

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“…Polymer‐bonded explosives (PBX) predominate in various weapon systems as energetic fillings because of their high‐explosion and low‐sensitivity behaviour. Although they are more chemically and mechanically stable than traditional explosives, many unexpected explosions occur during the processes of manufacture, transportation and application of PBX [1–3]. Failure modes caused by mechanical damage are sources of accidental ignitions.…”

Section: Introductionmentioning

confidence: 99%

Fracture Behaviour Investigation into a Polymer‐Bonded Explosive

Liu¹,

Hua²,

Duo-Wang³

et al. 2012

Strain

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Polymer-bonded explosive (PBX) is used widely in weapon systems. Failure of PBX caused by mechanical damage is one of the sources of accidental ignitions. A brittle crack of PBX produces local heating, creating a 'hot spot' finally. Investigation into the tensile fracture behaviour of PBX is one of the main works to determine the failure mechanism. Although many researchers have carried out the quasi-static Brazilian test to understand the damage evolution of PBX, the fracture feature of PBX under dynamic impact is rarely reported. In this article, dynamic Brazilian tests were conducted. A single-pulse loading apparatus was used to ensure that specimen was loaded only once during a dynamic Brazilian test. High-speed camera, digital image correlation and micro-observation techniques were adopted for strain measurement and microfracture observation. All the dynamic tensile crack exhibits transgranular fracture, which indicates more heat would released by the propagation of crack and more friction between fractured crystal surfaces. On the basis of the theories of interface debonding and transgranular fracture, larger crystals are more prone to crack, whereas smaller crystals simply debond with neighbouring binders. Discrete element method simulation results show that specimen with interface debonding microcracks was able to sustain additional load until transgranular fracture begins.

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Autonomous characterization of plastic-bonded explosives

Cited by 2 publications

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Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Fracture Behaviour Investigation into a Polymer‐Bonded Explosive

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