Pore collapse and hot spots in hmx

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August undefined, 2024

WebThis paper offers a new method for calculating the reaction rate based on the pore collapse “hot-spot” ignition mechanism in multi-component polymer bonded explosives (PBXs), and proposes a mesoscopic reaction rate model that allows us to predict the shock initiation and detonation behaviors of multi-component PBXs with any explosive component proportion … WebMar 1, 1994 · A spherical pore collapses into an ellipsoid shape giving rise to high temperature regions of hot spots. For micro-pores of diameters below a few hundred …

Modeling pore collapse and chemical reactions in shock-loaded HMX …

WebJul 3, 2024 · For temperatures up to 3000 K, the normalized hot spot mass fraction from the cylindrical pore collapse is nearly encompassed by the responses of the realistic pores. The temperature rise and collapse morphology in the elliptical pores, however, show a strong dependence on both pore orientation and aspect ratio. In these simulations, the ... WebSep 1, 2024 · A multiscale modeling strategy is used to quantify factors governing the temperature rise in hot spots formed by pore collapse from supported and unsupported … bishop\u0027s transport wa

Pore Collapse and Hot Spots in HMX - AIP Publishing

Web311j Pore Collapse and Hot Spots in HMX. Approved for public release; distribution i5 unlimited. May 1, 2003. c . Title: MENIKOFF Author(s): RALPH. Submitted to: APS Topical … WebAn inea material (with the constibtive properties of HMX) is used to better focus on the mechanics of pore collapse. ' h o important findings resulted from this study. Eust, too … WebNov 1, 2024 · Springer et al. (2024) analyzed the effect of shock pressure and pore morphology on hot spot mechanisms in HMX. Under these high shock strength conditions, ... Pore collapse and hot spots in HMX. AIP Conf. Proc. (2004), pp. 393-396. View in Scopus Google Scholar. Menikoff and Sewell, 2002. darktide psyker going out with a bang

Hotspot formation due to shock-induced pore collapse in 1,3,5,7 ...

Crystal-scale modelling of pore collapse in ... - ScienceDirect

WebJun 27, 2024 · Due to their upstream location in the HMX grain, the surface pores collapse sooner than interior pores; thus, the extent of reaction will generally favor these … WebDec 4, 2014 · This paper is devoted to the building of a numerical pore collapse model with “hot-spots” formation for the impacted damage explosives. According to damage mechanical evolution of brittle material, the one-dimensional elastic-viscoplastic collapse model was improved to incorporate the impact damage during the dynamic collapse of … bishop\\u0027s transport perthWebAug 4, 2004 · Pore Collapse and Hot Spots in HMX. R. Menikoff. Published 4 August 2004. Engineering. Hot spots are critical for initation of explosives because reaction rates are … bishop\u0027s tuition

"WebMay 7, 2014 · The collapse of microscopic pores contained within a crystal is one such process that localizes energy and generates hot spots. Given the difficulty of resolving the details of pore collapse in shock compression experiments, it is useful to study the problem using direct numerical simulation. " - Pore collapse and hot spots in hmx

Pore collapse and hot spots in hmx

Effects of high shock pressures and pore morphology on hot spot ...

WebMay 7, 2014 · The collapse of microscopic pores contained within a crystal is one such process that localizes energy and generates hot spots. Given the difficulty of resolving the … WebAug 2, 2024 · This work presents our attempt to examine a single hot spot mode (void collapse) in single-crystal octahydro-l,3,5,7-tetranitro-l,3,5,7-tetrazocine (HMX) embedded in Sylgard. The hot spot heating mechanisms involved with pore collapse include adiabatic heating, jetting, and viscoplastic dissipation. Quantifying the dynamics of a pore collapse ...

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Webhigh hot-spot temperatures, even for a strong shock at the high end of the measured Pop plot. Other dissipative mechanisms applicable to pore collapse are viscous heating and … WebJan 1, 2003 · @article{osti_976649, title = {Pore collapse and hot spots in HMX}, author = {Menikoff, Ralph}, abstractNote = {The computing power now available has led …

WebJun 27, 2024 · Due to their upstream location in the HMX grain, the surface pores collapse sooner than interior pores; thus, the extent of reaction will generally favor these morphologies because they have more time to grow. In general, multiple smaller hot spots tend to react faster than a single larger hot spot because they accelerate one another's … WebMay 7, 2024 · @article{osti_1643769, title = {Hotspot formation due to shock-induced pore collapse in 1,3,5,7-tetranitro-1,3,5,7-tetrazoctane (HMX): Role of pore shape and shock …

WebHot spots are critical for initation of explosives because reaction rates are very temperature sensitive. For a plastic-bonded explosive, shock desensitization experiments imply that … WebMar 23, 2013 · For example, if the hydrodynamic void collapse leads to hot spots, the exponent \(r\) is assigned the value 3. ... Menikoff, R.: Pore collapse and hot spots in HMX. In: AIP Conference Proceedings, Portland, Oregon (USA), pp. 393–396 (2004)

WebAug 4, 2004 · An inert material (with the constitutive properties of HMX) is used to better focus on the mechanics of pore collapse. Two important findings result from this study. First, insufficient resolution can significantly overpredict the hot‐spot mass. Second, up to …

WebJan 28, 2024 · A multiscale modeling strategy is used to quantify factors governing the temperature rise in hot spots formed by pore collapse from supported and unsupported shock waves in the high explosive HMX ... darktide psykinetic wrathWebNov 1, 2024 · Pore collapse thermal-mechanical-chemical responses and underlying physics of (011) and (110) oriented HMX were investigated under the shock velocities of 500 m/s, … bishop\\u0027s trash removal morrisonville nyWebTo predict the influence of aluminum contents particle size <20 m on the shock initiation and growth of reaction in an aluminized explosive CL-20/AL/Binder, 85/15/5, a new numerical model is utilized. The model is based on the elastic-visco-plastic ... darktide preacher best weaponsWebMay 5, 2024 · It has been widely accepted that the pore collapse is a dominant mechanism of “hot-spot” ignition in pressed solid explosives [[22], [23], [24]], which, in general, includes the viscoplastic deformation, the hydrodynamic micro-jetting, the compression of gas in cavities and the shear bandings, and the explosive maybe enter the process of transition … bishop\u0027s university acceptance rateWebAug 4, 2004 · Pore Collapse and Hot Spots in HMX. R. Menikoff. Published 4 August 2004. Engineering. Hot spots are critical for initation of explosives because reaction rates are … dark tide scandroid lyricsWebDOI: 10.1016/j.mechmat.2024.103644 Corpus ID: 228869864; Sensitivity of pore collapse heating to the melting temperature and shear viscosity of HMX @article{Kroonblawd2024SensitivityOP, title={Sensitivity of pore collapse heating to the melting temperature and shear viscosity of HMX}, author={Matthew P. Kroonblawd and … bishop\\u0027s uniformWebJan 1, 2003 · Here, for the collapse of a single pore driven by a shock, the dependence of the temperature distribution on numerical resolution and dissipative mechanism i s investigated. An inert material (with the constibtive properties of HMX) is used to better focus on the mechanics of pore collapse. ' h o important findings resulted from this study. bishop\u0027s university academic calendar