Pore collapse and hot spots in hmx

Author: wwei

August undefined, 2024

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 ... 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.

The Pore Collapse “Hot-Spots” Model Coupled with Brittle Damage …

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. 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 … flower blow and make a wish

Sensitivity of pore collapse heating to the melting temperature 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 … 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. WebJan 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 … flower blowdryer by drew barrymore

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

Viscosity and heat conduction effects in pore collapse

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). WebIn 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. flower blowing in the wind imagesWebJul 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 … flower blooms at night

"WebSep 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. " - Pore collapse and hot spots in hmx

Pore collapse and hot spots in hmx

WebPredictions indicate that hot-spot intensity is only marginally affected by initial porosity ( 1−ϕ⎯⎯⎯s,0 ) for all piston speeds, whereas hot-spot size, number density, volume fraction ... 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 …

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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 … 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 …

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 … 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 …

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) 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 …

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.

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 … flower blowing in the wind gifWebApr 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, ... greek mythology lizardWebJan 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 ... greek mythology liver pecked outWebApr 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 ... greek mythology majors in collegeWebJan 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 … greek mythology love poemsWebDOI: 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 … flowerblue1Webleads 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 … flower blowing in the wind