Components, explosive train

Aromatic, see Terminology, Organic, p.244 By Mass, see Terminology, By Mass, p.232 Components, explosive train, n.o.s., see Initiating Explosives, p. 119 Desensitized, see Terminology, Desensitized,... 

Components, Explosive Train, n.o.s. Articles containing an explosive designed to transmit the detonation or deflagration within an explosive train. UN App. B, ICAO A2, US 173.59... 

Explosive train Arrangement of explosive components in which the initial force from the primer is transmitted and intensified until it reaches and sets off the main explosive composition. 

An explosive device is initiated or detonated by an explosive train — an arrangement of explosive components by which the initial force from the primary explosive is transmitted and intensified until it reaches and sets off the main explosive composition. Most explosive trains contain a primary explosive as the first component. The second component in the train will depend on the type of initiation process required for the main explosive composition. If the main explosive composition is to be detonated, the second component of the train will burn to detonation so that it imparts a shockwave to the main composition. This type of explosive train is known as a detonator. Detonators can be initiated by electrical means, friction, flash, or percussion. 

INITIATOR The first component in a pyrotechnic or explosive train. 

Relay. A component of a high-explosive train that provides the required energy to reliably initiate the next element in the train. Specifically applied to small charges that are initiated by a delay element and, in turn cause the functioning of a detonator (Ref 40a, p 120)(See slso in this Volume, Section 4, Part F (Compare with Lead)... 

According to definition given by Ohart (Ref 17, p 55), such a detonator is "an explosive component for initiation of detonation in an explosive train or transmitting a primer im-... 

The definition of fuze detonator given in Ref 52, p 5-2 is "A detonator is used in the explosive train to create a detonating wave, then transmit it to the next component"... 

Some bursting explosive trains have the primer and detonator combined into one component. Such a device is known as primer-detonator. If a definite time delay in the... 

Accdg to definition given in Ref 23, p 3-22 (slightly reworded) It is an initiating explosive - train component fired by an electrical impulse supplied by the energy either stored within the fuze before release of the missile, or generated within the fuze system just prior to or at impact of the fuze. An electric primer serves to initiate the next component of the train which can be either a detonator or delay element... 

Definition of a relay as given by Odierno of PicArsn (Ref 45d, p I) is An element of a fuze explosive train which augments an outside and otherwise inadequate output of a prior explosive component so as to reliably initiate succeeding train component. Relays, in general, contain a small single charge such... 

Fuzes contain safety devices that tend to prevent functioning until after the fuze has been subjected to centrifugal and setback forces, after the round is fired. In the so-called bore-safe fuzes, the path of the explosive train is interrupted so that, while the projectile is still in the bore of the weapon, premature expln is prevented should any of the more sensitive fuze elements (such as primer and/or detonator) start to function. Interruption is usually achieved by inserting out-of-line components or interrupter blocks or slides. Although this leaves the fuze in an unarmed position, it would not be considered safe in handling or shipping, unless the fuze was not provided with safety devices such as safety wires or cotter pins. These outside devices must be removed prior to inserting the fuzed round of ammunition into gun barrel, but the fuze will still be unarmed because some of its inside parts are not free to move to their proper positions so that the fuze may operate in its intended manner... 

Part II Introduction to Explosive Train Part III MIL-STDS That Control Development of Explosive Components Pdrt IV Characteristics of Electric Detonators... 

Explosive train A series of combustible or explosive components arranged in order of decreasing sensitivity designed to initiate explosives. 

Main charge The main or final explosive component in an explosive train. Munitions Any and all military explosives. 

An explosive composition is initiated or detonated via an explosive train. The explosive train is an arrangement of explosive components by which the initial force from the primer is transmitted and intensified until it reaches and sets off the main explosive composition. Some components of explosive trains are summarized in Table 4.5. 

Delay. A mechanical, electronic, or explosive train component which introduces a controlled time delay in some phase of the arming or functioning of a blasting cap or fuze Ref Glossary of Ord (1959h 91-L... 

An explosive train component normally consisting of a primer, a delay column, and a relay detonator or transfer charge assembled in that order in a single housing to provide a controlled time interval. 

In an explosive train, that component which, when detonated by the primer, in turn detonates a less sensitive but larger high explosive (usually the booster) or when containing its own primer initiates the detonation. The detonator can be activated by either an explosive impulse (primer) or a non-explosive impulse. When activated by a nonexplosive impulse, the detonator contains its own primer. Detonators are generally classified as percussion, stab, electric, or flash, according to the method of initiation. Explosive charge placed in certain equipment and set to destroy the equipment under certain conditions (-> Initiator). 

The sequence of functions incorporated in such a series, as primary explosive, booster, secondary (or "main charge") explosive, is called an explosive train. The elements or components of such a train may themselves also consist internally of a sequence of explosives, the selection of a component depending on the nature of the stimulus applied, whether from a preceding element or from a source external to the train. 

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