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Hydrocode Models of Blast Tube Exper...

Hoch, Lauryn A.

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Hydrocode Models of Blast Tube Experiments Driven by Composition C-4.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Hydrocode Models of Blast Tube Experiments Driven by Composition C-4./
Author:	Hoch, Lauryn A.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2024,
Description:	127 p.
Notes:	Source: Masters Abstracts International, Volume: 85-07.
Contained By:	Masters Abstracts International85-07.
Subject:	Mechanical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30691523
ISBN:	9798381404081

Hydrocode Models of Blast Tube Experiments Driven by Composition C-4.
Hoch, Lauryn A.

Hydrocode Models of Blast Tube Experiments Driven by Composition C-4. - Ann Arbor : ProQuest Dissertations & Theses, 2024 - 127 p.

Source: Masters Abstracts International, Volume: 85-07.

Thesis (M.S.)--New Mexico Institute of Mining and Technology, 2024.

This item must not be sold to any third party vendors.

Blast tube tests were conducted between 2015 and 2020 at the Los Alamos National Laboratory, for multiple characterization and target environment objectives. The desired blast wave at the exit of the tube would have a peak over-pressure of approximately 1034 kPag (150 psig) and a positive pulse duration for as long as practically possible. There have been multiple attempts to predict or reproduce experimental results in hydrocode, but these were limited to a couple shots or were conducted with codes with limited capabilities (e.g. limited to no implementation of equations of state that are suitable for high explosives and the mixing of detonation products with ambient air). This research is an attempt to develop a baseline hydrocode model in CTH that comprehensively reproduces blast tube experiments that used Composition C-4 as the main charge and a charge mass between 34.0 and 86.2 kg (75-190 lbm). This baseline model is then used to explore expanded capabilities of the current blast tube facility and arrangements of a C-4 charge. Sensitivity studies on density, charge dimensions and location were also conducted. A baseline model with a 0.8 cm flat mesh and history rate variable burn (HVRB) model replicated some experimental results; however caution is advised as certain quantities of interest (QOI) are sensitive to mesh size and sample rate. This baseline model is considered suitable for predicting the results of detonating C-4 charge masses between 45.4 and 99.8 kg (100-220 lbm). At locations of 44.89 ±0.15 m (147.3 ±0.5 ft) from the closed end of the blast tube, there are 63 combinations of charge mass, radius, charge placement, and target location that achieve either an incident or peak overpressure of 1034 kPag. The average positive pulse duration (tD) for these models is 46.4 ms with a standard deviation of 11.6 ms, however a separate study is required to strengthen the prediction of tD following the discussion of the computational domain and the arrival of detonation products at the location of interest. Comments on algebraic methods to predict QOIs in a blast test are provided.

ISBN: 9798381404081Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Blast tube

Hydrocode Models of Blast Tube Experiments Driven by Composition C-4.
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245 1 0 $a Hydrocode Models of Blast Tube Experiments Driven by Composition C-4.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 127 p.
500 $a Source: Masters Abstracts International, Volume: 85-07.
500 $a Advisor: Hargather, Michael;Anderson, William.
502 $a Thesis (M.S.)--New Mexico Institute of Mining and Technology, 2024.
506 $a This item must not be sold to any third party vendors.
520 $a Blast tube tests were conducted between 2015 and 2020 at the Los Alamos National Laboratory, for multiple characterization and target environment objectives. The desired blast wave at the exit of the tube would have a peak over-pressure of approximately 1034 kPag (150 psig) and a positive pulse duration for as long as practically possible. There have been multiple attempts to predict or reproduce experimental results in hydrocode, but these were limited to a couple shots or were conducted with codes with limited capabilities (e.g. limited to no implementation of equations of state that are suitable for high explosives and the mixing of detonation products with ambient air). This research is an attempt to develop a baseline hydrocode model in CTH that comprehensively reproduces blast tube experiments that used Composition C-4 as the main charge and a charge mass between 34.0 and 86.2 kg (75-190 lbm). This baseline model is then used to explore expanded capabilities of the current blast tube facility and arrangements of a C-4 charge. Sensitivity studies on density, charge dimensions and location were also conducted. A baseline model with a 0.8 cm flat mesh and history rate variable burn (HVRB) model replicated some experimental results; however caution is advised as certain quantities of interest (QOI) are sensitive to mesh size and sample rate. This baseline model is considered suitable for predicting the results of detonating C-4 charge masses between 45.4 and 99.8 kg (100-220 lbm). At locations of 44.89 ±0.15 m (147.3 ±0.5 ft) from the closed end of the blast tube, there are 63 combinations of charge mass, radius, charge placement, and target location that achieve either an incident or peak overpressure of 1034 kPag. The average positive pulse duration (tD) for these models is 46.4 ms with a standard deviation of 11.6 ms, however a separate study is required to strengthen the prediction of tD following the discussion of the computational domain and the arrival of detonation products at the location of interest. Comments on algebraic methods to predict QOIs in a blast test are provided.
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650 4 $a Aerospace engineering. $3 1002622
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653 $a Blast tube
653 $a Blast wave
653 $a C-4 charge
653 $a Friedlander waveform
653 $a Peak overpressure
653 $a Positive pulse duration
690 $a 0548
690 $a 0538
690 $a 0204
710 2 $a New Mexico Institute of Mining and Technology. $b Mechanical Engineering. $3 3181546
773 0 $t Masters Abstracts International $g 85-07.
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791 $a M.S.
792 $a 2024
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30691523