How to Determine the Effects of a TNT Blast

You can determine the effects of a TNT blast by noting the location of the explosive source in relation to surrounding structures, measuring the peak pressure of the blast and the phase duration of the blast, the TNT charge mass and the size of the explosive device. John Dewey and Alex van Netten of Canada developed an explosive device simulation software called "EBlast" used in determining evacuation distances from explosive devices for emergency personnel. This software uses information compiled from data dating back to World War II to the present and calculates the effects of TNT blasts including lethal probability, structure damage, eardrum injury and damage to window panes.

Things You'll Need

  • EBlast software
  • AirBlast software
  • AWAL software
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Instructions

    • 1

      Input what type of device you would like to measure the damaging effects into the EBlast system. The system will then convert the selected explosive device to the equivalent TNT surface burst charge noting the charge mass and size of the device you selected.

    • 2

      Initiate the companion piece of software, AirBlast, to calculate the peak hydrostatic pressure and the hydrostatic-pressure impulse for the selected TNT charge in relation to the variation in distance to potential surrounding structures. AirBlast uses a large database of experimental data to determine the physical properties of blast waves produced by surface-burst, free-air and height-of-burst explosions.

    • 3

      Initiate the AWAF (Adaptable Weighted Average Flux) software to simulate detonation of the TNT charge. AWAF simulates a high-pressure, high-temperature sphere of gas with a controlled rate of energy release. Use AWAF to reproduce the blast wave properties of step 2, by selecting the same initial pressure, temperature and energy release. The same initial conditions can then be used to simulate the TNT blast wave effects of the selected device on varying urban environments given that the structures are static during the blast wave.

    • 4

      Review the graph compiled by EBlast. This graph will denote potential damage to structure and injury to persons in relation to peak pressure of the blast, impulse of the blast and distance from blast.

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