A Simulated And Experimental Investigation Into The Effect Of Casing Material Fracture On The Axial Performance Of Cylindrical Explosive Charges

Abstract

The current models used to predict the damage and fracturing behavior of brittle solids are based on empirical data from the application of indirectly applied shocks or gradually applied pressure increases. Neither of these conditions accurately represent the conditions a solid casing around an explosive charge would undergo during detonation. Simulation has become a prominent and reliable form of predicting explosive behavior and blast outcomes. The programs are equipped with the ability to adapt with the addition of new research knowledge and user demands. With such tools one could model the response of an explosive charge's casing material upon detonation. During which, the casing would be exposed to extremely high pressures, with zero buildup, over a short duration. The response to such conditions has been validated for blast effects in air and other materials with slow sound velocities, as the shock wave can be easily observed experimentally. The ability to validate the models for solids in contact with an explosive charge, which are not translucent and have vastly higher sound velocities, is far more limited. Experimental methods that do exist are costly and require equipment that is not easy to operate or store. The biggest limitations are the visibility in the immediate contact region and the inability of most sensors to operate under the harsh and rapid setting produced during detonation. As a result, the need for indirect deliverables is prevalent. One needs to be able to compare the model, not to the immediate response of a solid casing material, but to the secondary response of a witness material. This report presents information from the plate dent test, commonly used as an explosive diagnostic test, as a way of identifying measurable differences in the behavior of charge casings. This method is low cost, simple, and repeatable. Charges of the same explosive and density are cased in different solid materials and detonated on top of a metal plate. The response of the metal plate is measured in terms of the dent produced by the explosive charge. A preliminary study was conducted comparing two simulation techniques and found that the thickness and velocity of the detonation wave is dependent on the casing material and affects the depth of the dent produced. Future simulation work will validate the test's ability to distinguish between casing materials and to identify the most accurate simulation technique.

Department(s)

Mining Engineering

International Standard Serial Number (ISSN)

1551-7616; 0094-243X

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2023 American Institute of Physics, All rights reserved.

Publication Date

26 Sep 2023

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