scholarly journals Development and Evaluation of Small Shaped Charge Jet Threats

2017 ◽  
Vol 8 (1) ◽  
pp. 23-38
Author(s):  
Arthur DANIELS ◽  
Stan DEFISHER ◽  
Greg STUNZENAS ◽  
Nausheen AL-SHEHAB ◽  
Ernest L. BAKER
Keyword(s):  
Lower Cost ◽  
Threat Assessment ◽  
Shaped Charge ◽  
International Standards ◽  
High Rate ◽  
Continuum Models ◽  
Severe Reaction ◽  
Explosive Charges ◽  
Shaped Charge Jet ◽  
Aluminium Target

Because of their prolific nature on the battlefield, rocket propelled and gun-launched grenades are of particular concern to the soldier, particularly because of the severe reaction that occurs when a munition is hit by the shaped charge jet. As a result of the danger that such a detonation poses, it is necessary to more precisely understand the behaviour of munitions subjected to these types of devices. In response to these threats, standardized 81 mm and 40 mm shaped charge warheads were developed for use during threat assessment testing to act as a consistent, lower-cost representative of shaped charge projectiles commonly encountered on the battlefield, and to help quantify the interaction of these jest with explosive charges. The international standards for shaped charge jet threat testing uses the Held initiation criteria V2D, where V is the jet velocity and D is the diameter. V2D was computationally predicted using the high-rate continuum models CALE and ALE-3D. The surrogate warheads were test fired through aluminium target plates to strip off jet mass to adjust the V2D to the threat munition.

Filling the Gap between Hypervelocity and Low Velocity Impacts

2019 ◽  
Author(s):  
Werner Arnold ◽  
Thomas Hartmann ◽  
Ernst Rottenkolber
Keyword(s):  
High Explosive ◽  
Hypervelocity Impact ◽  
Shaped Charge ◽  
Low Velocity ◽  
Projectile Velocity ◽  
Critical Stimulus ◽  
Velocity Impact ◽  
Hypervelocity Impacts ◽  
Explosive Charges ◽  
Shaped Charge Jet

Abstract During more than one decade of studying initiation phenomenology numerous papers at the previous HVIS and other symposia ([1] - [12]) were published. Most of them dealt with the hypervelocity impact initiation of plastic bonded high explosive charges by shaped charge jets (SCJ) and a few ones reported results in the ordnance velocity impact regime with STANAG projectiles and explosively formed projectiles (EFP) ([2] & [11]). A recent finding of our investigations of shaped charge jet (SCJ) attacks suggests that the critical stimulus S = v2∙d (v = SCJ / projectile velocity; d = SCJ / projectile diameter) for the initiation of a munition can no longer be seen as a constant (S ≠ const.) ([11] & [10]). Also, known equations, e.g. Jacobs-Roslund [13], are not capable to describe low velocity and hypervelocity impacts with the same parameter set.

scholarly journals Elastic–plastic modelling of shaped charge jet penetration

2006 ◽  
Vol 462 (2076) ◽  
pp. 3663-3681 ◽  
Author(s):  
Roman Novokshanov ◽  
John Ockendon
Keyword(s):  
Free Boundary ◽  
Local Scale ◽  
Shaped Charge ◽  
The Self ◽  
High Rate ◽  
Metal Target ◽  
Elastic Plastic ◽  
Shaped Charge Jet ◽  
Self Consistency ◽  
Penetration Velocity

This paper concerns the mathematical modelling of high-rate penetration of a metal target by a shaped charge device that produces a high-velocity jet. A key objective is to predict the penetration velocity, be it subsonic, transonic or supersonic. We do this by considering, on the local scale near the tip of the penetrated cavity, an elastic–plastic free boundary problem that takes into account the residual stresses produced by the moving plasticized region of the target. It is the self-consistency of this elastic–plastic model that dictates predictions for the penetration velocity.

Investigation of a Nickel-Aluminum Reactive Shaped Charge Liner

2013 ◽  
Vol 80 (3) ◽  
Author(s):  
Philip Church ◽  
R. Claridge ◽  
P. Ottley ◽  
I. Lewtas ◽  
N. Harrison ◽  
...  
Keyword(s):  
Formation Process ◽  
Microstructural Analysis ◽  
Target Material ◽  
Shaped Charge ◽  
High Rate ◽  
X Rays ◽  
Nickel Aluminum ◽  
Dendritic Microstructure ◽  
Reactive Powder ◽  
Shaped Charge Jet

A nickel/aluminum (NiAl) reactive powder system has been investigated to determine its mechanical properties under quasi-static and high rate compression to understand its deformation behavior. A shock recovery system has been used to define shock reaction thresholds under a triaxial loading system. Two nickel/aluminum (NiAl) shaped charge liners have been fired into loose kiln dried sand to determine whether the jet material reacts during the formation process. A simple press tool was developed to press the liners from a powder mixture of nickel and aluminum powder and a simple conical design was used for the liner. The shaped charge jet particles were recovered successfully in the sand and subjected to a detailed microstructural analysis. This included X-ray diffraction (XRD) and optical and electron microscopy on selected particles. The analysis demonstrated that intermetallic NiAl was detected and all the aluminum was consumed in the particles examined. In addition, different phases of NiAl were detected as well as silicon oxide in the target material. There was also some evidence that the aluminum had melted along with evidence of a dendritic microstructure. This is the clearest evidence that the shaped charge jet material has reacted during the formation process. Simulations have been performed using the GRIM Eulerian hydrocode to compare with flash X-rays of the jet.

An Empirical Shaped Charge Jet Breakup Model

2014 ◽  
Author(s):  
Ernest L. Baker ◽  
James Pham ◽  
Tan Vuong
Keyword(s):  
Shaped Charge ◽  
Jet Breakup ◽  
Shaped Charge Jet ◽  
Breakup Model
Sign in / Sign up

Export Citation Format

Share Document