Pore collapse and hot spots in hmx

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August undefined, 2024

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 … 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 …

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

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 ... 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. daily-cash safe handover

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

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. 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 … 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 … daily cash safe deposit log form

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

Comparative Analysis of Detonation Growth Characteristics between 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 ... 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 ... daily cash reconciliation templateWebDOI: 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 … biography example for kids

"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

Modeling pore collapse and chemical reactions in shock-loaded …

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. 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 ...

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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 … 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 …

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 … 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 …

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 … 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 …

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).

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, ... biography euclidWebJan 1, 2003 · @article{osti_976649, title = {Pore collapse and hot spots in HMX}, author = {Menikoff, Ralph}, abstractNote = {The computing power now available has led … daily cash sales reconciliation formWebAug 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 … biography exercisesWebAug 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 … biography examples for schoolWebMar 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 … biography explanationWebAug 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 … daily cash report excelWebNov 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. daily cash register template