Experimental Method for Explosion Effect Determination
The study of the fragmentation originated from explosions is a challenging task, considering the conditions in which the phenomena occur. Those conditions are directly related with the nature of the explosion, which generates a high speed response of ever
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Abstract The study of the fragmentation originated from explosions is a challenging task, considering the conditions in which the phenomena occur. Those conditions are directly related with the nature of the explosion, which generates a high speed response of every part of the system; including dynamic behaviours from the chemical, mechanical, and aerodynamical point of view. This study presents an experimental approach to the determination of fragmentation characteristics, isolating the fragmentation effects from the shockwave. Based on standard ITOP 4-2-813, measurement methodology and instrumentation device were developed and implemented. This standard provides simple guidelines for designing experiments for explosion effects, taking into account the symmetric geometry of the explosive specimen for simplifying data recollection, by measuring mass-size in one half of a test arena and velocity of fragments in the opposite symmetric half. Velocity was assessed by microcontroller driven electronic hardware for which a custom barrier sensor was designed for manufacturing with single layer thin (thickness \0.3 mm) FR-4 copper clad. The speed reduction of a typical fragment was verified by simulation using coupled SPHLagrange. Finally, a sample experiment was done for checking the operation of the system, finding an ease of use in field.
J. Camargo (&) L. E. Muñoz Department of Mechanical Engineering, Universidad de los Andes, Bogotá, Colombia e-mail: [email protected] L. E. Muñoz e-mail: [email protected]
A. Öchsner et al. (eds.), Design and Analysis of Materials and Engineering Structures, Advanced Structured Materials 32, DOI: 10.1007/978-3-642-32295-2_10, Ó Springer-Verlag Berlin Heidelberg 2013
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J. Camargo and L. E. Muñoz
1 Introduction Due to the complexity and variety of shapes and all the different locations of a target in a blast, it is necessary to estimate the probability of damage in an indirect manner by measuring the dynamic variables that describe the phenomenon in some significant points and extrapolating to the whole area of analysis. Using data that relate those variables with the damage associated to a target, one can predict the destructive capacity in a specified detonation condition. For multiple purpose bombs, the detonation can be divided into two different phenomena: Fragmentation: after detonation, the bomb casing is divided into fragments that travel at different speeds in a range from hundreds to thousands meters per second. Shock wave: the supersonic combustion process that happens in the detonation produces the propagation of a high speed wave which transports an important part of the energy of the chemical reaction. Different studies focused on explosion shockwave measurement are found in literature [1–3]. Few have considered fragment behaviour but aiming to the wound effects via simulation and medical testing [4–6]. This study presents an experimental approach to the determination of fragmentation characteristics, isolating the fragmentation effects from the
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