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| Keywords: Blastcurves psi.svg en Overpressure ranges from 1 to 50 psi 6 9 to 345 kPa of a 1 kiloton air burst as a function of burst height The thin grey curve indicates the approximate optimum burst height for a given ground range de Abhängigkeit des Druckpegels einer 1-Kilotonnen-Explosion von Entfernung und Detonationshöhe Die dünne graue Kurve gibt näherungsweise die optimale Detonationshöhe an Own SiriusB Created 21 November 2008 Image Blastcurves_1 png Additional Info Plotted with Gnuplot 4 2 2 Isobars are based on numerically solved formulae from the internal help pages of the http //nuclearweaponarchive org/Library/Nukesims html BLAST software the H_opt curve is an analytical fit using the inversely plotted formula <math> \mathit GR _\mathit OP \over\mathrm m \left \left 9 54\cdot10 -3 \ H_\mathit OP \over\mathrm m 1 95 \right 4+\left 3 01\ H_\mathit OP \over\mathrm m 0 75 \right 4\right 1/4 \ </math> This function should fit both BLAST output and Figures 3 73a-c taken from Glasstone Dolan The Effects of Nuclear Weapons 1977 http //www princeton edu/~globsec/publications/effects/effects shtml EoNW77 as a compromise Both sources differ slightly EoNW77 shows the maximum low-pressure ranges at somewhat lower altitudes whereas for high pressures >40 psi BLAST shows no optimum altitudes at all see the innermost isobar However since numerical fitting of curves taken from a paper would be a Sisyphean task while BLAST already outputs plottable numbers only isobars from the latter are plotted here Why psi Most sources e g Glasstone Dolan 1977 or Carey Sublette's http //nuclearweaponarchive org/ Nuclear Weapon Archive use pounds per square inch as pressure units As a rule of the thumb e g most non-reinforced buildings are destroyed for overpressures above 5 psi However the pressures can easily be converted into SI units e g kilopascals where 1 psi 6 8947573 kPa or roughly one psi equals seven kPa Additional notes A note on Gnuplot SVG terminal Set size variable as fixed the default in Gnuplot not dynamic to ensure correct aspect ratio This was the reason for uploading a 2nd version Nuclear explosion physics SVG diagrams | ||||
