Pore collapse and hot spots in hmx

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August undefined, 2024

WebJan 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 … WebJan 5, 2024 · The collapse of pores plays an essential role in the shock initiation of high energy ... simulations to study the formation of hot-spots during the collapse of an 80 nm size void in a ... and J. E. Reaugh, “ Modeling the effects of shock pressure and pore morphology on hot spot mechanisms in HMX,” Propellants Explos.

Modeling The Effects of Shock Pressure and Pore Morphology on …

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 … 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 … earbuds compatible with iphone 6

Modeling The Effects of Shock Pressure and Pore Morphology on …

Webleads to the formation of hot spots, ... we consider the shock-induced closure of a single pore in -HMX crystal. The problem of pore collapse has been considered in previous work … 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 … 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. css alabama model ship

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

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 … WebJan 17, 2024 · A multi-step thermal-decomposition model is employed to simulate the chemical reaction of the HMX. Firstly, numerical simulations were implemented for a few plane shock experiments and it is demonstrated that the material model of HMX have reasonable accuracy. Then, the pore collapse in a HMX crystal under a shock at 500 m/s … earbuds compatible with iphone 8WebJan 13, 2024 · The Lindemann Law model is used for shock melting in HMX. In contrast to previous pore collapse studies at lower shock pressures (≤10 GPa) in HMX and shorter … earbuds compatible with amazon fire tablet

"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) " - Pore collapse and hot spots in hmx

Pore collapse and hot spots in hmx

WebMay 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 … WebNov 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, …

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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 … 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 ...

WebTo 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 ... WebJul 20, 2004 · A multiscale modeling strategy is used to quantify factors governing the temperature rise in hot spots formed by pore collapse from supported and unsupported …

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 …

WebApr 5, 2024 · Request PDF On Apr 5, 2024, H. Keo Springer and others published Cover Picture: Simulating the Effects of Grain Surface Morphology on Hot Spots in HMX with Surrogate Model Development (Prop ...

WebNov 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, 1000 m/s and 2000 m/s. The results provide insights into understanding the hot spot formation and ignition of HEs under shock loading. earbuds compatible with iphoneWebSep 25, 2014 · Pore collapse and hot spots in HMX. Article. Jul 2004; Ralph Menikoff; Hot spots are critical for initation of explosives because reaction rates are very temperature sensitive. earbuds compatible with note 4WebAug 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 … earbuds compatible with iphone xrWebJun 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 … earbuds compatible with ps4WebJun 27, 2024 · We investigate the effects of shock pressure and pore morphology on the formation and growth of hot spots in HMX (octahydro‐1,3,5,7‐tetranitro‐1,3,5,7‐tetrazocine). earbuds concerts redditWebNov 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. css alabama wreck siteWebAug 16, 2024 · Small angle neutron scattering (SANS) with contrast variation was used to characterize the fractal behavior and embedded porosity of micro/nano-sized 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) crystallites, gauging the effects of particle sizes on the microstructural features. Scattering results reveal that the external surface of micro-sized … css alarm company