LINEAR SHAPED CHARGE
Millions of feet. Decades of operation. We know Linear.
We manufacture linear explosive products, including Linear Shaped Charge (LSC) , in a dedicated facility in Hollister, CA. Also known as Flexible Linear Shaped Charge (FLSC), our FLSC consists of a continuous explosive core enclosed in a seamless metal sheath, shaped in the form of an inverted “V“. Upon detonation, the continuous meal sheath liner and explosive produce a uniform linear cutting action. Like MDC, FLSC for Canopy Fracturin or Transparency Removal Systems is best sheathed in tin (patented) or lead and loaded with secondary explosives. This application of the Monroe Effect is enhanced by the careful control of charge dimension and configuration, as well as the sheath thickness and uniformity. Our Shaped Charge assemblies are unaffected by severe vibration and shock and have an inherent reliability not found in any other type of energy release system.
The practical application of linear shaped explosive for the penetration of armor steel dates back to 1888 and the efforts of C.E. Monroe who discovered that the greatest effect is produced when the explosive is not in direct contact with the steel. Monroe found that by increasing the depth of depression or cavity in the explosive, he was able to increase the depth of penetration for a given explosive quantity. A graphic of the Monroe Effect is shown below. The mechanism of the linear lined charge involves collapse of the metal liner due to the focusing of the detonating explosive high pressure wave as it becomes incident to the side wall. If the standoff distance is optimum, collapse of the liner can be complete, before it reaches the target. A small jet of metal emerges from the base of the cone while collapse continues. The jet from the cone then breaks up into small particles followed by the slug or major portion of the cone. The jet particle and not the slug constitute the penetrating agent. The high velocity jet particles generate high pressure when they impact on the target, measured in terms of several hundred thousand atmospheres. Such pressures so greatly exceed the yield strength of the target material that it is literally pushed aside from the path of the jet by plastic flow.
The penetrating action of the shaped charge is affected by a number of factors. The explosive used is of great importance; and, while the depth of penetration is indicated to be more closely related to the detonating pressure than the rate of detonation, in general, the greater effect is produced by the explosive having the greater rate of detonation. Very little effect is produced by explosives having rates of detonation of 5,000 meters per second or less. Comparative tests with liners of different metals give results that indicate, in general, the depth of penetration is greater with metals of greater density. However, ductility also plays a major role in penetration. The standoff distance or distance between the target and the base of the chevron cavity required for maximum penetration effect varies with the metals used as a liner. With a given liner, there is an optimum standoff distance above and below which less penetration effect is obtained. As stated previously, the jet is the penetrating agent; and, as standoff distance is increased, there is more time in which the jet can become extended. However, after a certain standoff distance, the jet has a tendency to break up both axially and radially.
FLSC is available in a variety of sheath and explosive materials and can have core-load (explosive per unit length) ranging from 10 grains per foot to 800 plus grains per foot. Detonation velocities range from 6,000 to over 8,000 meters/second depending on the explosive and metal clad material selected. The forces generated by detonating FLSC radiates outward in all directions. The inverted “V” geometry of FLSC serves to concentrate a portion of these forces in one direction creating an efficient cutting jet. The cutting jet developed by FLSC can be used to penetrate and sever a variety of targets.
In applications where little or no backblast is desired, attenuation material is employed to contain these forces. The attenuation material can range from a metal charge holder to low density plastic foam or silicone rubber, depending on specific requirements.
Typical applications of FLSC include rocket thrust/flight termination, launch vehicle stage separation, aircraft emergency egress, payload fairing separation and deployment.
LINEAR SHAPED CHARGE ASSEMBLY
LSC Cutter Assembly
LSC mounted in an initiation manifold with additional mounting brackets that “slide” along length for securing.
- Launch Vehicle Stage Separation
- Payload Fairing Separation / Deployment
- Rocket Thrust Termination
- Flight Termination Systems
- Fairing / Skin Severance
- Range Safety Flight Destruct
- Aircraft Emergency Egress
Velocity of Detonation
6,000 to >8,000 meters / second depending on explosive, sheath and core-load
+400 °F (+204.44 °C) possible depending on explosive and sheath material
Available Sheath Material
Dependent on core-load and sheath
> .500” High strength steel alloy possible
An ordnance device typically is composed of several components that are initiated sequentially. Reliability of this initiation train is critical to its performance. This paper describes the testing and analysis methods used to understand the mechanisms involved and to achieve a high reliability.
RDX loading density of greater than 98% TMD (3) created conditions for recrystallization of RDX (from released occluded cyclohexanone) into large crystal structures. These large RDX crystal structures are void less, therefore not allowing Hot Spots for a shock stimulus to generate the conditions needed to start and sustain a chemical reaction.
ENABLING MISSION SUCCESS
MEETING INSENSITIVE MUNITIONS REQUIREMENTS
Ever since the tragic incident on the USS Forrestal in 1967, there have been initiatives to decrease the sensitivity of high explosives and propellant reactions from threats such as slow and fast cook off, bullet impact, shape charge jet, fragment impact and sympathetic detonation.
HOW PAYLOAD SEPARATION SYSTEMS WORK
Launch vehicles and missiles contain configurations that need to dispense a payload during the course of their mission. We have been manufacturing payload separation systems for over 50 years.
ENVELOPE / INTERFACE DIMENSIONS
The height and width of our Shaped Charges are dependent on core-load and sheath material selected and are tailored for program requirements.
LET US HELP
Need more information or have a specific requirement you would like us to meet?
Contact us at the link below, or for immediate assistance call 831.630.5402.