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Topic: Brisance

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Cyclotrimethylene trinitramine

Deflagration

Nitrocellulose

	Brisance (Gerald L. Hurst)
		In my opinion, the most logical units for brisance would be pressure generated in the unconfined state, i,e, "detonation pressure" as opposed to "bore hole pressure." These are the two terms used in commercial explosive work to indicate brisance and the potential for useful work output (heave).
		One definition of brisance is "The ability to accelerate metal." The "tone" of the explosion is related to the expansion of the gas cloud after brisance has done its work.
		In each case the brisance is determined by the energy and density of the material, assuming it is shot in a sufficiently large diameter.
	yarchive.net /explosives/brisance.html (4955 words)

	Brisance: Definition and Links by Encyclopedian.com - All about Brisance
		The rapidity with which an explosive develops its maximum pressure is a measure of the quality known as brisance.
		A brisant explosive is one in which the maximum pressure is attained so rapidly that a shock wave is formed, and the net effect is to shatter material surrounding or in contact with it.
		Thus brisance is a measure of the shattering ability of an explosive.
	www.encyclopedian.com /br/Brisant.html (137 words)

	Brisance - Wikipedia, the free encyclopedia
		Brisance is a measure of the rapidity with which an explosive develops its maximum pressure.
		In addition to strength, explosive materials display a second characteristic, which is their shattering effect or brisance (from the French meaning to "break"), which is distinguished from their total work capacity.
		Brisance is also the name of a prominant hardcore band from Woburn, Massachusetts.
	en.wikipedia.org /wiki/Brisance (285 words)

	Encyclopedia: Brisance (Site not responding. Last check: 2007-10-20)
		Brisance values are primarily employed in France and Russia.
		The shattering effect, or brisance, of an explosive depends upon the velocity of detonation.
		Special types of explosives that are sensitive to heat or shock and have a medium-high brisance are used to initiate the detonation of less sensitive high explosives.
	www.nationmaster.com /encyclopedia/Brisance (560 words)

	Wikipedia: Explosive material
		Brisance values are primarily employed in France and the Soviet Union.
		The sensitivity, strength, and brisance of an explosive are all somewhat dependent upon oxygen balance and tend to approach their maximums as oxygen balance approaches zero.
		Because sensitivity, brisance, and strength are properties resulting from a complex explosive chemical reaction, a simple relationship such as oxygen balance cannot be depended upon to yield universally consistent results.
	www.factbook.org /wikipedia/en/e/ex/explosive_material.html (4933 words)

	Low brisance detonating cord - Patent 4488486
		A low brisance detonating cord including an outer case of explosive material of predetermined detonating velocity and an inner core of explosive material concentrically carried in the outer core.
		The brisance of detonating cords is dependent upon several factors, three of which are, the type of explosive, the amount of explosives and the detonating velocity.
		In some instances where the cord is used to ignite other materials, such as boron potassium nitrate pellets or double-base propellants, the brisance may be so great that the material to be ignited is "blown" away before proper or uniform ignition occurs or the igniter material is crushed resulting in over-ignition.
	www.freepatentsonline.com /4488486.html (888 words)

	MSN Encarta - Printer-friendly - Explosives (Site not responding. Last check: 2007-10-20)
		Among these characteristics are the ease with which they can be detonated and their stability in conditions of heat, cold, and humidity.
		Some of the newer high explosives with a detonation rate of 9,140 metres per second are extremely effective for military demolition and certain types of blasting.
		Explosives used as propellants in rifles and cannon should burn still more slowly, as they are required to deliver a steadily increasing push to the projectile in the barrel of the gun rather than a sudden shock which, if strong enough, might break the gun.
	uk.encarta.msn.com /text_761577751___2/Explosives.html (248 words)

	THR - Primers - physics and chemistry ?'s
		July 19th, 2004 04:22 PM I once read that the old test for brisance was to put a small sample of the explosive of interest in the middle of a weighed pan of sand and detonate it.
		Brisance was recorded as the amount of sand blown out of the pan.
		Brisance then really is an energy factor with speed factored in.
	www.thehighroad.org /printthread.php?t=92419 (764 words)

	KClO3/nitromethane H.E. [Archive] - The Explosives and Weapons Forum
		The term brisance is also better known in the general public, you'll hear about a "brisant" explosive used by a terrorist rather than "an explosive with a high VoD".
		As VoD is roughly proportional to density, brisance increases with the square of density.
		March 31st, 2002, 10:20 PM Brisance isn't an exact measurement, rather a comparitive measurement of one explosives ability to (smash, crush, shatter, destroy) as compared to another.
	www.roguesci.org /theforum/archive/index.php/t-169.html (1797 words)

	Increasing brisance idea - The Explosives and Weapons Forum
		This represents an increase in brisance of a magnitude of 2,400 (41,67% of the unmodified charge’s time is needed to reach peak pressure).
		Basically, the degree to which brisance is increased depends on how much, or rather what proportion, of the charge (in the direction of propagation) is made up of the faster explosive.
		Brisance has nothing to do with 'how fast the hole mass is consumed', but with 'how fast it hits the confinement'.
	roguesci.org /theforum/showthread.php?p=73544#post73544 (2370 words)

	MSN Encarta - Search View - Explosives
		These initiators are used in conjunction with a charge of cyclonite or PETN, which have largely replaced the tetryl (trinitrophenylmethylnitramine) used previously.
		These sensitive explosives have high brisance and explosive strength values.
		They are frequently used also as booster charges between the detonator and the major charge of high explosive in large shells and bombs.
	encarta.msn.com /text_761577751__1/Explosives.html (1325 words)

	brisance - definition, thesaurus and related words from WordNet-Online
		brisance - definition, thesaurus and related words from WordNet-Online
		Hint: double-click any word to get it searched!
		brisance - the shattering or crushing effect of a sudden release of energy as in an explosion
	www.wordnet-online.com /brisance.shtml (45 words)

	exposive information,explosive (Site not responding. Last check: 2007-10-20)
		Brisance values are primarily employed in France andthe Russia.
		The oxygen balance (OB) is calculated from the empirical formula of a compound in percentage of oxygen required for completeconversion of carbon to carbon dioxide, hydrogen to water, and metal to metal oxide.
		Because sensitivity, brisance, and strength are properties resulting from a complex exposive chemical reaction, a simplerelationship such as oxygen balance cannot be depended upon to yield universally consistent results.
	www.vsearchmedia.com /exposive.html (4640 words)

	Explosion Theory
		Brisance is the destructive fragmentation effect of a charge on its immediate vicinity.
		Brisance also describes the shattering effect of an explosive which is a combination of power and velocity.
		The higher the power and the higher the velocity of detonation, the greater the brisance and shattering effect.
	www.fireandsafety.eku.edu /VFRE-99/Theory/Definitions/definitions-1.htm (1082 words)

	Prilled explosive composition - Patent 4100000 (Site not responding. Last check: 2007-10-20)
		Applicant has found that the brisance and blasting power of TNT may be increased by replacing some of the TNT with suitable explosive ingredients.
		4 is a graph illustrating the combined high brisance and high blasting power of the compositions according to the present invention, in prill form.
		This indicates that water may be purposely added to the bore hole to propagate detonation or to increase the detonation velocity and hence the brisance.
	www.freepatentsonline.com /4100000.html (5451 words)

	explsoive information,explosive (Site not responding. Last check: 2007-10-20)
		High explsoives explode in supersonic reactions and without confinement, are compounds, are initiated byshock or heat and have high brisance (the shattering effect of an explosion).
		The rapidity withwhich an explsoive reaches its peak pressure is a measure of its brisance.
		Because sensitivity, brisance, and strength are properties resulting from a complex explsoive chemical reaction, a simplerelationship such as oxygen balance cannot be depended upon to yield universally consistent results.
	www.vsearchmedia.com /explsoive.html (4640 words)

	History Channel Search Results (Site not responding. Last check: 2007-10-20)
		MINING, (q.v.), when it is desirable to dislodge large pieces of rock or ore, explosives with a lower detonation velocity and lower brisance must be employed.
		Explosives that are sensitive to heat or shock and have a medium-high brisance are used to detonate less sensitive high explosives.
		Such high explosives as dynamite are often mixed with inert materials to reduce sensitivity and lower brisance.
	www.historychannel.com /thcsearch/thc_resourcedetail.do?encyc_id=208914 (1267 words)

	Types of explosives
		Their strength and brisance are much lower, but they are sufficient to detonate high explosives.
		Brisance: The speed with which an explosive develops its maximum pressure is a measure of the quality known as brisance.
		High Explosives usually have exceptionally high brisance, with the exception of shaped charges, which direct all of their force in one direction to create a predetermined pattern.
	www.enjoy.org /hstech/thinkquest03/Explosives/Types.html (768 words)

	Primers - physics and chemistry ?'s - THR
		Don't know about the primary reaction, but I understand manufacturers use a greater or lesser amount of various chemicals, including magnesium, to adjust the strength/length of the primer flame ("brisance").
		I'm not positive about this, Chris, but I always thought brisance was the destructive effect an explosion carried with it.
		I once read that the old test for brisance was to put a small sample of the explosive of interest in the middle of a weighed pan of sand and detonate it.
	www.thehighroad.org /showthread.php?t=92419 (832 words)

	JCE 2001 (78) 1596 [Dec] Demonstrations with Nitrocellulose: Possible Further Pedagogic Value (re J. Chem. Educ. ...
		The comparison of the energy in a candle with that of an equivalent mass of dynamite is an interesting one for students to consider.
		If students were given the structures and heats of combustion per mole for both TNT and propane, they could determine the energy available from one kilogram of each.
		The discussion should also include the comment that explosives commonly have both the oxidizer and the fuel in the same structure and this significantly increases the rate of reaction to the point of creating an explosive process.
	jchemed.chem.wisc.edu /HS/Journal/Issues/2001/Dec/abs1596_4.html (393 words)

	An Overview of Pyrotechnics (Site not responding. Last check: 2007-10-20)
		Brisance is a relative concept and is often measured as a percentage of the brisance of TNT.
		Set amounts of explosives are detonated on a lead block, the degree of destruction demonstrates relative brisances.
		The degree of expansion of the hole is a measure of the strength of the explosive.
	www.chem.shef.ac.uk /chm131-2001/chb01aa/defining_properties.html (491 words)

	Nitromethane Explosives - Page 3 - The Explosives and Weapons Forum
		First, depending on the environmental conditions that may affect the way sound travel up to your ears, the sound of the explosion cannot be a reliable indicator for revealing the degree of brisance.
		However i know the brisance of the kinepak because i have tested it lot of times, i think it has a good brisance for a AN based explosive.
		Despite this composition's recorded velocity of only 6000 m/s, i believe this is faster then most homemade explosive compositions because of the nature of the liquid, consistent density, which would allow for a far better medium for shockwave propagation.
	www.roguesci.org /theforum/showthread.php?t=2077&page=3 (2869 words)

	An Overview of Pyrotechnics (Site not responding. Last check: 2007-10-20)
		An explosive may be described by its brisance.
		Brisance describe the shattering power of an explosive in the area immediately surrounding the explosive.
		Linear burning rate of a composition is the rate at which the process of combustion travels through the composition.
	www.chem.shef.ac.uk /chm131-2001/chb01aa/glossary.html (864 words)

	SD-1.net: Alias Discussion > Definition: Brisance
		Brisance, noun: the shattering or crushing effect of a sudden release of energy as in an explosion; aftermath
		Her fingers are the first to move, are the first signs that life still resides in her pale form.
		I had to go and read the beginning parts in the series before I made it here, so sorry it took a while! But if you are bored someday, I did leave reviews along the way, though some are better than others, lol.
	sd-1.net /lofiversion/index.php/t34416.html (6511 words)

	Explosive material : Explosive
		Low Explosives (Burns through deflagration[?] rather than detonation[?] wave, are a mixture, are initiated by heat and require confinment to create an explosion) and
		High Explosives (will explode without confinement, are compounds, initiated by shock or heat, supersonic reaction, high brisance).
		In addition to strength, explosives display a second characteristic, which is their shattering effect or brisance (from the French meaning to "break"), which is distinguished form their total work capacity.
	www.fastload.org /ex/Explosive.html (4901 words)

	Journal of Technical Physics - Abstracts for vol. 41, no. 4 (2000)
		It is confirmed that the quantitative criteria of the theoretical estimate of the HE brisance proposed in the scientific literature are based on several assumptions, which are contradictory to the real course of the explosion phenomenon, and therefore they are erroneous.
		The reflection process of the detonation wave from the inertial rigid partition was used in order to derive the new formula describing the relative brisance of the HE.
		Moreover, the brisance of numerous commercial explosives and the military ones has been analysed, too.
	jtp.ippt.gov.pl /abstracts/41-4.html (1588 words)

	Wampum: Follow-up on Cole on MSN
		These use high, or very-high brisance explosives, the kind I wrote about here and here discussing the RDX, HMX and PETN inventories abandoned in-place (transfered to the armed opposition's reserve) by US forces in Iraq.
		The "proof" offered is that a 37-ton object was moved horizontally 40 feet, with a 180 degree rotation while off the ground.
		So 14 Marines are killed by blast effect produced by being proximal to a large, low brisance explosive (their vehicle was the lifted, not shredded-in-place, except for secondary explosions of on-board munition and fuel, 37-ton object), and their lives are re-purposed to provide context for yet another fake "Iran" story.
	wampum.wabanaki.net /archives/002101.html (819 words)

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