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To quote from WIKIPEDIA

The simplest form of a blast wave has been described and termed the Friedlander waveform.[11] It occurs when a high explosive detonates in a free field, that is, with no surfaces nearby with which it can interact. Blast waves have properties predicted by the physics of waves. For example, they can diffract through a narrow opening, and refract as they pass through materials. Like light or sound waves, when a blast wave reaches a boundary between two materials, part of it is transmitted, part of it is absorbed, and part of it is reflected. The impedance of the two materials determine how much of each occurs.

The equation for a Friedlander waveform describes the pressure of the blast wave as a function of time:

$P(t)=P_se^{-\frac{t}{t^*}}(1-\frac{t}{t^*})$ enter image description here

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  • $\begingroup$ Hello @majordoctor. Welcome to PSE. You have defined this phenomena, but what exactly is your question? $\endgroup$
    – joseph h
    Commented Sep 9, 2020 at 1:55
  • $\begingroup$ Hi Dr. jh, Can Friedlander equations be used to model buried explosive? Which means the media is rock, not air. $\endgroup$
    – majordoctor
    Commented Sep 9, 2020 at 2:31

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