Pore collapse and hot spots in hmx

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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 … 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 microns, the strain rate in localized regions is in the range of 10 6 to 10 9 per second. Without conductivity, the temperature increases with decreasing diameter.

Dynamics of void collapse in shocked energetic materials

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 ... 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. raverly camden hills poncho

Void Collapse in Shocked ‐HMX Single Crystals: Simulations and ...

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 … WebDOI: 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 … WebAug 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 … raverly donita girls cropped cardigan

Sensitivity of pore collapse heating to the melting temperature and …

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

WebAug 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 … WebJan 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. ravernclouk buhitterWebAug 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 … raverly knitting patterns for ponchos

"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. " - Pore collapse and hot spots in hmx

Pore collapse and hot spots in hmx

Shock initiation of multi-component insensitive PBX explosives ...

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 … WebJun 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).

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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 ... WebApr 13, 2024 · The main reason for friction ignition of HMX-based cast PBX is the friction hot spot generated by microcracks formed after interface damage of the tablet mesoscopic model, ... analyzed and compared four hot spot mechanisms (pore collapse; hole collapse; hole collapse) in the projectile target experiment, shock heating, ...

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 … WebAug 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 …

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 … 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 …

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 …

WebApr 13, 2024 · The main reason for friction ignition of HMX-based cast PBX is the friction hot spot generated by microcracks formed after interface damage of the tablet mesoscopic … raverly minecraft beaniesWebMar 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) raverly cowl neck sleevelessWebIn this study, we explore the effects of high shock pressures (15-38 GPa) with long shock durations and different pore morphologies on hot spot mechanisms in HMX. HMX is chosen as the model material because we have experimental data on many of the chemical-thermal-mechanical properties required for pore collapse simulations. simple baked chicken and riceWebMay 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. raver lyricsWebJan 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 … simple baked chicken breastsWebNov 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. simple baked chickenWebJun 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 … simple baked chicken breasts allrecipes