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ecos
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doesn't HMX has VoD = 9100 m/s ?
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PHILOU Zrealone
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Depends on density...9100 at max density.
@Nitro-genes,
I'm rolling on floor laughing by reading their meaning of HMX...hexamethyl-3-nitroamine...what makes all their text doubtfull.
Also why did they stop at 50% Aluminium? It seems that at 60% one may expect VOD 8000m/s...since there is no sign of slope change...???
Speed of sound in metals is high if:
-dense (but this is not the most important factor)
-rigid (elasticity modulus is linked ... thus low compressivity)
None of those apply to Aluminium.
-And most of all into a continuous media (a block of metal)
This certainly doesn't apply to Aluminium powder which is surrounded by air voids thus limiting the speed of sound
to 350m/s.
-solid (speed of sound is faster into solids than into liquids and itself faster than into gases).
Also a powder surrounded by air will interfere with sound propagation into one direction since each interface change will deviate the soundwave.
To get a high speed of sound into a solid material one has to play with dense, crystaline material (ideally monocrystalline),...usually very hard
("uncompressible" thus with rigid...each modification of the crystal latice comes back to its original state very fast).
[Edited on 14-9-2016 by PHILOU Zrealone]
PH Z (PHILOU Zrealone)
"Physic is all what never works; Chemistry is all what stinks and explodes!"-"Life that deadly disease, sexually transmitted."(W.Allen)
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nitro-genes
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Haha, maybe hexamethyl-3-nitroamine (unlike HMX) has a very unique structure, only surpassed by its amazing detonation properties.  Just noticed the VoD going up with increasing Al content and made a post. It's
almost as if one of the axis is reversed, but seen the graph was likely copy pasted from the original reference mentioned this also seems strange,
should have read the original article regarding details of the experiments before posting. At the compositions TMD, Its is interesting to think about
how the speed of sound and density of the metal powder affects detonation properties, though I haven't really looked into this yet.
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PHILOU Zrealone
International Hazard
Posts: 2893
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Maybe that the increase of apparent VOD is linked to their method of determination of the VOD....
If they used a plate dent test to correlate with the VOD...it is wel possible that the metallic dust plays a role similar to shaped charge or
explosive formed projectile (EFP)...thus meaning that somehow the Gurney energy (metal acceleration effect) is at play...
This means for example that if you have:
A) 3 gr explosive plate dent test
B) 2 gr explosive and 1 gr metal X shaped charge
C) 2 gr explosive and 1 gr metal X powder
Then probably the plate dent test relative power or VOD/brisance will be into the order B> C >> A
PH Z (PHILOU Zrealone)
"Physic is all what never works; Chemistry is all what stinks and explodes!"-"Life that deadly disease, sexually transmitted."(W.Allen)
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