Predicting High Explosive Detonation Velocities from their composition and structure (II)

1981 ◽  
Vol 6 (4) ◽  
pp. 91-93 ◽  
Author(s):  
L. R. Rothstein
Keyword(s):  
High Explosive ◽  
Composition And Structure ◽  
Explosive Detonation

scholarly journals High Speed, Localized Multi-Point Strain Measurements on a Containment Vessel at 1.7 MHz Using Swept-Wavelength Laser-Interrogated Fiber Bragg Gratings

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5935
Author(s):  
Steve Gilbertson ◽  
Mark Pickrell ◽  
Dario Castano ◽  
Gary Salazar ◽  
Tom Beery ◽  
...  
Keyword(s):  
Strain Measurement ◽  
High Speed ◽  
High Explosive ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Laser Source ◽  
Global Changes ◽  
Element Analysis ◽  
All Optical ◽  
Explosive Detonation

Dynamic elastic strain in ~1.8 and 1.0 m diameter containment vessels containing a high explosive detonation was measured using an array of fiber Bragg gratings. The all-optical method, called real-time localized strain measurement, recorded the strain for 10 ms after detonation with additional measurements being sequentially made at a rate of 1.7 MHz. A swept wavelength laser source provided the repetition rate necessary for such high-speed measurements while also providing enough signal strength and bandwidth to simultaneously measure 8 or more unique points on the vessel’s surface. The data presented here arethen compared with additional diagnostics consisting of a fast spectral interferometer and an optical backscatter reflectometer to show a comparison between the local and global changes in the vessel strain, both dynamically and statically to further characterize the performance of the localized strain measurement. The results are also compared with electrical resistive strain gauges and finite element analysis simulations.

scholarly journals Discovery of a nanodiamond-rich layer in the Greenland ice sheet

2010 ◽  
Vol 56 (199) ◽  
pp. 747-757 ◽  
Author(s):  
Andrei V. Kurbatov ◽  
Paul A. Mayewski ◽  
Jorgen P. Steffensen ◽  
Allen West ◽  
Douglas J. Kennett ◽  
...  
Keyword(s):  
High Explosive ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Impact Indicator ◽  
Glacial Ice ◽  
Ice Caps ◽  
Very High ◽  
Explosive Detonation ◽  
Discrete Layer ◽  
The Last Glacial

AbstractWe report the discovery in the Greenland ice sheet of a discrete layer of free nanodiamonds (NDs) in very high abundances, implying most likely either an unprecedented influx of extraterrestrial (ET) material or a cosmic impact event that occurred after the last glacial episode. From that layer, we extracted n-diamonds and hexagonal diamonds (lonsdaleite), an accepted ET impact indicator, at abundances of up to about 5×106 times background levels in adjacent younger and older ice. The NDs in the concentrated layer are rounded, suggesting they most likely formed during a cosmic impact through some process similar to carbon-vapor deposition or high-explosive detonation. This morphology has not been reported previously in cosmic material, but has been observed in terrestrial impact material. This is the first highly enriched, discrete layer of NDs observed in glacial ice anywhere, and its presence indicates that ice caps are important archives of ET events of varying magnitudes. Using a preliminary ice chronology based on oxygen isotopes and dust stratigraphy, the ND-rich layer appears to be coeval with ND abundance peaks reported at numerous North American sites in a sedimentary layer, the Younger Dryas boundary layer (YDB), dating to 12.9 ± 0.1 ka. However, more investigation is needed to confirm this association.

Detection of high explosive detonation across material interfaces with chirped fiber Bragg gratings

2015 ◽  
Vol 54 (13) ◽  
pp. 3849 ◽  
Author(s):  
Steve Gilbertson ◽  
Scott I. Jackson ◽  
Samuel W. Vincent ◽  
George Rodriguez
Keyword(s):  
High Explosive ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Material Interfaces ◽  
Chirped Fiber Bragg Gratings ◽  
Explosive Detonation
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