Analysis of explosive aspect ratio in the blast wave: From flat to spherical case

J. Artero-Guerrero, J. Pernas-Sánchez, Filipe Teixeira-Dias, David Varas, Jorge López-Puente

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The analysis of the effects of an explosion is crucial when designing blast protection structures, both for defence or accident mitigation, or in accident/attack reconstruction. The most studied physical parameters are directly related to the generated pressure pulse (overpressure, time of arrival, etc.), the induced impulse on the structure and the configuration of the blast wave. This work focuses in the influence of the explosive aspect ratio geometry in the wave generated. In order to asses this relation, a numerical model is developed to reproduce the dynamics of the generated pressure wave using the commercial finite element code LS-DYNA. A Multi-Material Arbitrary Lagrangian Eulerian (MM-ALE) technique is used as the CONWEP approach is not adequate to model such situations. Validation and verification of the proposed numerical model is achieved based on experimental data obtained by Lefrancois et al. [1] and Mespoulet et al. [2] in which a flat and a spherical explosive are used. Additionally the numerical model provides relevant information that cannot be obtained from the experimental results. Once the model is validated, a detailed analysis of the generated blast wave is done using different explosive geometry. Virtual tests are done with constant mass hemispherical, cylindrical and flat-shaped Formex F4HV samples. A detailed analysis of the generated blast wave is done, along with a thorough comparison between incident and reflected waves. The model is proved reliable, concluding that the frontal area of the high-explosive and therefore the aspect ratio is a determinant driving parameter for the impulse generated by the blast.
Original languageEnglish
Title of host publicationEuropean Solid Mechanics Conference
Publication statusPublished - 2018
EventEuropean Solid Mechanics Conference - Bologna, Italy
Duration: 2 Jul 20186 Jul 2018
Conference number: 10

Conference

ConferenceEuropean Solid Mechanics Conference
Abbreviated titleESMC
Country/TerritoryItaly
CityBologna
Period2/07/186/07/18

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