Fractography of Debris Question Re Deflagration vs Detonation

[MetalHead83]

As the header suggests, I'm looking for some literature for my research/investigation that can help differentiate the appearance of debris from a Deflagration vs Detonation perspective.
There are many aspects of the investigation I cannot talk about based on contracts/ legal constraints, so I posed the Question as general one about literature for my research/ investigation. I am currently digging through the AMS Hbk 12 on Fractography.

Background:
I'm a materials engineer with a fair bit of experience in failure analysis and fractography (abt 15 yrs)
The Ordnance was known and intended, a portion of the housing system failed in a closed-system.
I believe I have narrowed down the origin point of the housing failure as a whole (eliminating origin features on other debris items as secondary)
The event was so quick (1-2 ms) the pressure transducer data collection did not pick up a spike that would clearly indicate Detonation


Thanks in advance for any assistance/ guidance

-T

 

[Alistair_Heaton]

Can't help but can suggest someone to ask.

Years ago I did a bit of EOD training with the Royal Engineers in the UK. Not the dangerous improvised stuff...

But they had some very knowledgeable civilian people on this explosive blast interpretation. Who were also linked to the health and safety.

I suspect you might have something similar where you are. The terrorism unit with your big city police would also know

 

[FacEngrPE]

measuring fast events is difficult. high speed video of an experiment might be helpful.
this information may be helpful.

The pressures developed by deflagrating explosions are dependent on the fuels involved, their geometry, and the strength (failure pressure) of a confining vessel or structure (if any). Pressures can range from 0.1psi to approximately 100psi for gasoline:air mixtures to several thousand psi for propellants. Times of development are on the order of thousandths of a second to a half-second or more. Maximum temperatures are on the order of 1000-2000 degrees Celsius (2000-4000 degrees Fahrenheit).
Deflagrations tend to push, shove, and heave, often with very limited shattering and little production of secondary missiles (fragmentation). The maximum pressures developed by deflagrations are often limited by the failure pressure of the surrounding structure.

Detonation speeds are on the order of 1000-10000 m/s so times of development are on the order of millionths of a second. Temperatures produced can be 3000-5000 degrees Celsius and pressures can be from 10000 psi to 100000 psi.
Detonations, on the other hand, tend to shatter, pulverize and splinter nearby materials with fragments propelled away at a very high speeds. There is no time to move and relieve pressure so damage tends to be much more localized (seated)in the vicinity of the explosive charge (and its initiator) than a deflagration whose damage is more generalized. Damage from a deflagration tends to be more severe away from the ignition point, as the reaction energy grows with the expanding reaction (flame) front.

https://www.interfire.org/res_file/def_det.asp

 

[Alistair_Heaton]

Actually centurion dynamics London rings a bell for this stuff.