Rheinmetall Waffe Munition Insensitive Ammunition for the Artillery

35 Pages·2006·4.76 MB·English

Rheinmetall Waffe Munition
Insensitive Ammunition for the Artillery
Dr. Paul Wanninger
1
Insensitive Artillery Charges
155 mm Artillery Charges
Requirements
• Acceleration of the round 18 000 g
• Penetration of a concrete wall
• High performance
• Insensitive charge
Gap-Test > 25 kbar
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Insensitive Artillery Charges
HE Charges Properties
Melt cast Cast PBX Pressed PBX
Melting point Melting Decomposition Decomposition
70 – 80° C ~ 180° C ~ 180° C
Mechanical Properties
Tensile strength 300 [N/mm2] 0,5 - 2 [N/mm2] 10 – 50 [N/mm2]
Elongation - 10 – 20[%] 1 – 2 [%]
Young‘s modulus > 1000 [N/mm2] 10 – 15 [N/mm2] 200 – 800 [N/mm2]
Coeffizient of
10-5 [K1] 10-4 [K1] 5 • 10-5 [K-1]
Thermal expansion
Shock sensitivity
10 – 16 [Kbar] 30 – 60 [Kbar] 17 – 26 [Kbar]
Gap Test (21 mm)
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Insensitive Artillery Charges
HE Charges Properties
Melt cast Cast PBX Pressed PBX
Raw materials TNT, RDX RDX, HMX, … RDX, HMX
HMX, NTO + Polymersystem + Thermoplaste
Process Melting Mixing under HE + Binder +
Vacuum Solvent
(cid:1)
Casting Casting under Granules
(cid:1)
Controlled Vacuum Dosing
(cid:1)
Cooled Chemical reaction Pressing ~
(cid:1)
Shrinking 11 % of the volume Polyaddition 2000 – 2500 bar
TMD 98 % 99,5 % 97 – 98 %
Density gradient High No Yes, Depending
Vulnerability High Very low Middle
Homogeneity Low High Middle
Temperature
No Yes Yes
resistent
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Insensitive Artillery Charges
IHE
Formulation Process
Binder
Batch + +
Plasticiser
Bonding agent
/
Antioxidans Bicomponent +
Catalyst
Metal powder /
Extrusion +
High explosive
e.g. RDX, HMX
2 or 3 different
grain sizes
Curing agent
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Insensitive Artillery Charges
RDX
Influence of crystal shape
Included air
Included solvent
Impurities (grit)
Use of I-RDX
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Insensitive Artillery Charges
Rheology Flow Curve at 50° C
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Insensitive Artillery Charges
Processability
To decrease viscosity
• Grain size distribution
• Spherical grains }
Low specific surface
• Coated grains
• Non polar surfaces
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Insensitive Artillery Charges
Ammunition 155 mm HE – RH 30
Charge Rh 26
Mixing 155 mm
Casting
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Insensitive Artillery Charges
IHE GAP-Test
100
90
80
70
60 Detonation
]
r
a 50 Go / No go
b
k
[ 40 No reaction
30
20
10
0
Rh 26 Rh 26 Rh 26/2
Ø 21 mm Ø 50 mm Ø 21 mm
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