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Effect of blast and gas pressure on debris launching velocity under internal detonation

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Effect of blast and gas pressure on debris launching velocity under internal detonation

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dc.contributor.author Yu, Qing Jun
dc.contributor.author Fan, Sau Cheong
dc.date.accessioned 2011-09-09T06:35:08Z
dc.date.available 2011-09-09T06:35:08Z
dc.date.copyright 2010
dc.date.issued 2011-09-09
dc.identifier.citation Yu, Q. J., & Fan, S. C. (2010). Effect of blast and gas pressure on debris launching velocity under internal detonation. Design and Analysis of Protective Structures Conference.
dc.identifier.uri http://hdl.handle.net/10220/7037
dc.description.abstract Debris launching velocity is one of the major parameters in determining the debris hazard zone caused by accidental detonation of ammunition in a magazine. Upon detonation, the explosive generates a blast pressure. In tandem, gas pressure is also created due to accumulation of the gaseous products with high temperature produced by the explosion. It may cause the structural breakup and then exerts impulse on the debris. The impulse makes debris fly with an initial velocity. Subsequently, the pressure propels the debris to fly faster and accelerate until the overpressure (over the ambient pressure) drops to zero. After that, the debris continues to fly but slows down due to the frictional drag by the surrounding air. This paper presents a study to differentiate the effects of blast pressure and gas pressure on the debris launching velocity. Numerical simulations for a series of defined cases under different conditions are carried out. To begin, two basic and extreme cases are investigated. The first case is to detonate the explosive put inside a fully-constraint cubicle to evaluate the gas pressure. The second case is to detonate the explosive in an open space to evaluate the blast pressure. Then, a typical setup is used to evaluate the debris launching velocities under the effects of both blast pressure and gas pressure. In the numerical simulations, the high explosive (HE) and the air are modeled using Arbitrary-Lagrangian-Eulerian (ALE) multi-material formulations while the fluid-debris interaction is simulated via coupling techniques for fluid-structure interaction (FSI). Simulation results yield relatively good agreement with those obtained from experiments and empirical equations. It provides insight and explanations for the debris launching process which is hardly observed in the experiments. This study verifies the different effects on the resulting debris launching velocity due to the blast pressure and the gas pressure. It also shows that the gas pressure has dominant effect on the debris launching velocity.
dc.format.extent 10 p.
dc.language.iso en
dc.rights © 2010 Design and Analysis of Protective Structures.  This is the author created version of a work that has been peer reviewed and accepted for publication by Design and Analysis of Protective Structures.  It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document.  The official conference website is: http://www.cee.ntu.edu.sg/Conferences/daps2010/index.htm.
dc.subject DRNTU::Engineering::Civil engineering::Structures and design
dc.title Effect of blast and gas pressure on debris launching velocity under internal detonation
dc.type Conference Paper
dc.contributor.conference Design and Analysis of Protective Structures (3rd : 2010 : Singapore)
dc.contributor.research Protective Technology Research Centre
dc.contributor.school School of Civil and Environmental Engineering
dc.description.version Accepted version

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