The calculations are interesting but I am not sure they fully address a fragmentation warhead. The models seem to show a solid explosive inside a solid casing. The picture in
#167 is interesting in that there appears to be modifications that could potentially minimize deceleration. Is the central tube hollow? This is a method used in mining and excavation blasting to confine the explosive energy internally before full detonation is completed to break and lift the rock by leaving open drill holes with no powder - the initial energy goes into the voids before breaking outward. The black "dots" in the outer fragmentation casing also look like holes that potentially allow the fragmentation to utilize more of the velocity of the explosive by breaking into the holes before the casing fragments.
There is no question that microseconds after a detonation the velocity of the encasing material has decelerated rapidly but I assume the engineers that design warheads do everything to minimize the loss of velocity. Kind of a sad comment on what our species considers good engineering (no offence intended BombDr).
I'm in total agreement, which is why I get rid of such things (or used to until my hearing went)...
The picture on #167 is slightly misleading as its a cutaway for training/sales purposes, so the colours are irrelevant really.
The central tube (silver) is the booster charge or 'gaine' which is usually PETN type low explosives, which itself will have its own detonator which has some serious safe-to-arm protocols involved as generally speaking, anytime anything like this goes of early is considered bad form.
The gaine itself is usually housed in an alloy case, which in turn slides inside the main charge or 'main-fill', and sometimes referred to a the 'stores'. This is the yellow bit, but in reality would most likely be an off-white colour of light brown. The explosives itself would be most likely cast and contained in its own light alloy or fibreglass sleeve, to avoid corrosion or exudation of the chemicals, which could crystallise into a volatile grit in any cracks.
The outer frag sleeve would be metal colour (the red is for identification on the model) and again, covered in a fibreglass resin compound. Each part is modular for ease of assembly and storage. I'm uncertain but I don't think the black dots are significant in anyway.
The explosive train would be designed so that the missile clears the launcher and arms the warhead near the target for obvious reasons, then when it is ready to function, the signal from the safe-to-arm device will fire the detonator, which in turn will fire the gaine, which explodes the main fill and the chocolate block flag-sleeve then shreds whatever is within range. The missile casing itself is just a vehicle and has little fragmentation value and I would opine that most of it is vapourised in the first milliseconds of the process.
These Soviet era weapons are not without their problems as illustrated here:
http://www.theguardian.com/world/2002/mar/06/afghanistan1
But, in this case the EOD team(s) broke all the basic safety rules - disarmament by committee, using battery powered tools, introducing lubricants and solvents to the exuded crystals and trying to manually extract the explosive from the warhead in order to take it back to Germany as a training aid....