34 research outputs found
Interactions of inert confiners with explosives
The deformation of an inert confiner by a steady detonation wave in an
adjacent explosive is investigated for cases where the confiner is suciently strong
(or the explosive suciently weak) such that the overall change in the sound speed
of the inert is small. A coupling condition which relates the pressure to the deflection
angle along the explosive-inert interface is determined. This includes its dependence
on the thickness of the inert, for cases where the initial sound speed of the inert
is less than or greater than the detonation speed in the explosive (supersonic and
subsonic inert
ows, respectively). The deformation of the inert is then solved by
prescribing the pressure along the interface. In the supersonic case, the detonation
drives a shock into the inert, subsequent to which the
ow in the inert consists
of alternating regions of compression and tension. In this case reverberations or
`ringing' occurs along both the deflected interface and outer edge of the inert. For
the subsonic case, the
flow in the interior of the inert is smooth and shockless.
The detonation in the explosive initially defl
ects the smooth interface towards the
explosive. For sufficiently thick inerts in such cases, it appears that the deflection
of the confiner would either drive the detonation speed in the explosive up to the
sound speed of the inert or drive a precursor wave ahead of the detonation in the
explosive. Transonic cases, where the inert sound speed is close to the detonation
speed, are also considered. It is shown that the confinement affect of the inert on
the detonation is enhanced as sonic conditions are approached from either side