where
-
R is the Sachs-scaled distance from the charge (dimensionless),
R is the distance from the charge (m),
E is the charge combustion energy (J), and
Po is the ambient pressure (Pa).
The blast peak side-on overpressure and positive-phase duration are calculated from the
Sachs-scaled overpressure and the Sachs-scaled positive-phase duration. The overpressure
is given by