Expansion of the products from a sheet charge in a chamber

Pulsed Loading of Objects during Intense Expansion of Products of Explosion of Solid Explosives (Review)

“…Calorimetric measurements showed that the heat of explosive decomposition of the HE agrees with the tabular value of the explosion heat within the measurement error of ±10%. This means that there was no "overhardening" of explosion products during their heating by shock waves reflected from the chamber walls in the experiments of [47,48], which was observed in the experiments with TNT [49] and reduced the heat of explosive decomposition, as compared to the explosion heat determined for the HE explosion in a massive water envelope. We can assume that the "overhardening" process associated with comparatively slow chemical reactions changing the composition of explosion products "hardened" during EP spreading mainly occurs in an explosion of slowly reacting individual HEs.…”

“…The Grüneisen coefficient as a function of density for pure PETN, calculated by Eq. (2) on the basis of the data of [21], is reported in [47]. In the range of densities higher than 1000 kg/m 3 , this dependence was compared with the values of γ obtained by comparing the calculated and experimental "radius-time" diagrams for a cylindrical shell initially filled by the HE.…”

“…The measurements ofp andc [47,48] in experiments with various composite brisant HEs indicate that the effective ratio of specific heats at the stage of EP expansion corresponding to the absence of elastic forces lies in the range k 0 = 1.17-1.22 (γ 0 = 0.17-0.22). Reliability of γ 0 determination was confirmed by measurements of the velocity of sound in explosion products in the chamber, based on registering circulation of compression waves between the end faces of the chamber (Fig.…”

“…A direct method for determining γ 0 was developed in [47,48]. It is based on measuring the steady (hydrostatic) pressure of explosion productsp and the velocity of soundc in a closed explosion chamber with a charge density ρ 0 determined as the ratio of the HE weight to the chamber volume and corresponding to the absence of elastic forces:…”

“…Conservation laws [21] yield the following approximate relations for A and n in the detonation-wave front [47]:…”