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Slamfire occurs when the cartridge discharges as soon as it reaches the chamber, rather than waiting in the chamber to receive a firing pin impact when the trigger is pulled. Schematic of an Advanced Primer Ignition blowback operation that works in a similar way to slamfire by striking the cartridge as it is moving forward before it is fully ...
The velocity of detonation is an important indicator for overall energy and power of detonation, and in particular for the brisance or shattering effect of an explosive which is due to the detonation pressure. The pressure can be calculated using Chapman-Jouguet theory from the velocity and density.
In more detail (in the ZND model) in the frame of the leading shock of the detonation wave, gases enter at supersonic velocity and are compressed through the shock to a high-density, subsonic flow. This sudden change in pressure initiates the chemical (or sometimes, as in steam explosions, physical) energy release. The energy release re ...
Out-of-battery firings can be initiated by a deliberate action by the operator (i.e. pulling the trigger) or initiated involuntarily as part of a slamfire. In handheld firearms, damage from out-of-battery discharges often destroy the firearm's magazine and destroy or severely damage the receiver, bolt, firing pin, operating springs, and stock.
Detonation velocity can be measured by the Dautriche method. In essence, this method relies on the time lag between the initiation of two ends of a detonating fuse of a known detonation velocity, inserted radially at two points into the explosive charge at a known distance apart. When the explosive charge is detonated, it triggers one end of ...
Because the properties of an explosive compound is in some degree related to its density, [6] which is a result of with what pressure it is compressed during manufacture, the stages in a staged detonation may also come from each section having been pressed to a different density, giving it varying properties. [7]
Slamfire discharges are unlikely to hit the target and may cause collateral damage. [ 42 ] The time required for changing or reloading magazines can reduce the effectiveness of a rifle, as it imposes a duration limit on the continuous rate of fire.
Diagram of slapper and EBW detonators initiating detonation. (A) Slapper detonator's pellet or flyer impacts a wider area of surface on the explosive output charge, and even though energy is lost to the sides of the area impacted, a cone of explosive is efficiently compressed.