Abstract
Figure 4.1 below is a cartoon representing a typical parameter found in a blast wave at a time after the shock has separated from the source and a negative phase has formed. This may represent the overpressure, the overdensity or the velocity at a given time, as a function of range. The blast wave is characterized by a discontinuous rise at the shock front followed by an immediate decay to a negative phase. The positive phase of a blast wave is usually characterized by the overpressure and is defined as the time between shock arrival and the beginning of the negative phase of the over pressure. The negative phase may asymptotically approach ambient from below or, more commonly, end with a secondary blast wave which in turn may have a negative phase. In general the over pressure, over density and velocity will have different positive durations.
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Needham, C.E. (2010). Formation of Blast Waves. In: Blast Waves. Shock Wave and High Pressure Phenomena. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-05288-0_4
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DOI: https://doi.org/10.1007/978-3-642-05288-0_4
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