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PublishAndrea Malone Modified over 9 years ago
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MABS 21 2010 Israel THE SHAPE OF THE BLAST WAVE: STUDIES OF THE FRIEDLANDER EQUATION by John M. Dewey Dewey McMillin & Associates 1741 Feltham Road, Victoria BC Canada (www.blastanalysis.com)
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MABS 21 2010 Israel Characteristic Shape t t+t+ t+t+ PsPs
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MABS 21 2010 Israel Friedlander 1946 Friedlander suggested that the classic pressure time-history could be described by
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MABS 21 2010 Israel Press. vs Time 523.5m SB ANFO 2.205 kt (MINOR UNCLE)
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MABS 21 2010 Israel Friedlander Fit
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MABS 21 2010 Israel Density vs Time
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MABS 21 2010 Israel Total (Pitot) Pressure vs Time
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MABS 21 2010 Israel Dynamic Pressure (½ρu 2 ) vs Time
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MABS 21 2010 Israel Friedlander Fails at Higher Overpressures
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MABS 21 2010 Israel Modified Friedlander Equation Additional coefficient α
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MABS 21 2010 Israel Properties of Friedlander Equation Impulse in positive phase
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MABS 21 2010 Israel Properties of Friedlander Equation Total Impulse
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MABS 21 2010 Israel Properties of Friedlander Equation Minimum Pressure
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MABS 21 2010 Israel Blast Wave Profile
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MABS 21 2010 Israel Blast Wave Profile Low Overpressures
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MABS 21 2010 Israel Particle Tracer Photogrammetry
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MABS 21 2010 Israel Spherical Piston Path MISERS GOLD 2.445 KT ANFO SURFACE BURST
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MABS 21 2010 Israel Friedlander Fit to Piston Path
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MABS 21 2010 Israel Conclusions 1.The time histories of the physical properties of centered blast waves are well described by the Friedlander equation at peak overpressures less than 1 atm. 2. The wave profiles of the physical properties are well described by the Friedlander equation at peak overpressures greater than 1 atm.
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MABS 21 2010 Israel Conclusions 3.The trajectory of the spherical piston that drives a centered blast wave has the form of the Friedlander equation 4. Are there physical reasons why it should be expected that a point source release of energy would generate a spherical piston path of this shape?
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MABS 21 2010 Israel
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Properties of Friedlander Equation Relaxation Time t *
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