recommendations for shaped charge jet, munitions test procedure … · 2017-05-30 · shaped charge...
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RecommendationsFor Shaped Charge Jet,
Munitions Test Procedure
Part 2 : Gun Propellant
Dr Frédéric PEUGEOT, March 2003
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Shaped ChargeJet
VelocityDiameterComposition
PropellantBallisticsProperties
ImpetusBurn rate IgnitionTemperature
Propellant PhysicalProperties
CompositionParticle sizesBed loading density %TMD (voidage)HomogeneityGlass transition temp.Binder/Filler interaction
Propellant ShockSensitivity
CJ parametersHugoniotCritical energyCritical Diameter
PropellantConfiguration
ShapePerforations(number, size,…)Web SizeOuter diameterMassConfinement
IntroductionInfluencing factors
GB 19T - 120mmGB Bp - 120 mm
GB Se - 12.7 mm
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ShortcomingsScaling effects
NOL Large Scale Gap test
The greater, the less shock sensitive
LOVA-4
Triplebase-2
Triplebase-1
0 0.80.60.40.2 1.0 1.2 1.4 1.6 1.8 2.0
0.8
0.6
0.4
0.2
1.0
1.2
1.4
Web (mm)
Reaction level
The thicker,the more shock sensitive
U shape?
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Resolving ShortcomingsScaling effects
The response is driven bythe bed properties
The response is driven bythe grains properties
Actual Size
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AREA 1
Jet tip / Grainsinteraction
Mechanism:
Shock Detonation Transition
Reaction Mechanisms (1/2)Macroscale
AREA 2
Grains / Grainsinteraction
Mechanism: ?
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Type IV-VNO
YES
Area 1 ProtocolInteraction Jet-Grain(s)
Confinement
JetBow Shock
Cavity
CompressedPropellant
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Type IV-V
Energy providedby the jet impact
>Formulation Critical energy ?
Grains dimensions >
Grains critical dimensions ?
YESNO
YES
Area 1 ProtocolInteraction Jet-Grain(s)
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ShortcomingsCritical diameters
What is the influence of a perforation or several perforationson the critical diameter?
Formulation
A
BC
FormulationCritical Diameter
(mm)
2.9-4.1
3.8-4.72.7-3.8
But, Debenham obtained a high order response even with a web lowerthan the critical web….
Formulation Grains
Slotted TubeCritical Outer
Diameter (mm)
4.5-5.3
8.3-10.77-8.3
Slotted TubeCritical Web
(mm)
1.7-2.0
2.5-3.22.1-2.5
-40/50% +30/55%
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WATSON (1992)
X rays
ZIMMERMANN(1996)
X rays
43.9 µs
49.2 µs
Sympatheticdetonation
PEUGEOT (1996)
Reaction Mechanisms (2/2)Area 2 - Macroscale
Layerstransmission
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Sympathetic DetonationArea 2 - Mesoscale Mechanisms
donordonor donor
IDT
IDT
XDT I
XDT II
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NOType II-III
YES
Type I
Propellant BedArea 2
Area 2 ProtocolInteraction Grain(s)-Grain(s)
Sympathetic Detonationof the grains?
Bow Shock+Cavity
Area 1
Jet
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Test conditions
Test configuration
Represent the life cycleconfiguration
ConclusionsTesting Recommendations
No jet particulationNo inverted gradient effect
No spallLongest credible path
Stripper plate
Min attenuator thickness
Stand off
Test instrumentation
Threat & Reaction level
X-Ray
Witness plate
Representative casingRepresentative shieldingRepresentative dimensionsSufficient amount of prop.No additional Confinement
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ü Dimensional characteristics that reduce the risk ofSympathetic Detonation
ü The best mechanical properties (XDT issues)
ü The lowest bed loading density (opposite to ballisticsproperties) not to favour SD
ü The lowest Hugoniot
ü The highest pressure dependent critical energy curve
ü The highest critical diameter
ConclusionsThe best LOVA propellant
Gun propellant vulnerability to SCJI is drivenby 2 mechanisms:
- the sensitivity to shock of the gun propellant- the mechanical behavior of the gun propellant