Computational Airblast Modelling Of
Commercial Explosives
Author(s)
B. J. Zapata & D. C. Weggel
Abstract
Two separate blast tests were conducted inside a conventional, unreinforced,
brick building scheduled to be demolished. The small cylindrical explosive
charges (less than 9 kg each), composed of dynamite sticks bundled together,
were placed inside the building and detonated (in separate events) to study the
blast resistance of the structure. The pressures generated by the blasts were
recorded using a high speed data acquisition system. To better understand the
complex pressure loading caused by the blasts for use in structural response
modelling, the authors have undertaken a study to computationally model the
explosive detonations. Advanced computational modelling is of interest because
most tabular and other simplified blast load analysis techniques are inaccurate
for the case of a close-in (but outside the detonation products) blast produced by
a cylindrical charge. This paper presents the results of two dimensional airblast
simulations performed using CTH, a shock physics code written by Sandia
National Laboratories. The Jones-Wilkins-Lee (JWL) equation of state data for
dynamite available in the literature are reviewed and the equation coefficients are
adjusted to reflect the properties of the dynamite used in the tests. CTH
simulations are compared to the measured blast pressures and impulses to assess
the ability of the existing (adjusted) equation of state data to model currently
available commercial dynamite.
Keywords: explosives, equation of state, airblast, bomb blast, impact and blast
loading characteristics, interaction between computational and experimental
results.
Keywords
explosives, equation of state, airblast, bomb blast, impact and blast
loading characteristics, interaction between computational and experimental
results.
Related Book
Other papers in this volume
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