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Development of Cast Cure Explosives for Comp B Replacement · DLE-C054 is a promising composition...
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A premier aerospace and defense company 1 Development of Cast Cure Explosives for Comp B Replacement Prepared by: Robert Hatch, Paul Braithwaite, Nathan Seidner, and Jim Wright ATK Launch Systems May 11-14, 2009 NDIA IM/EM Technology Symposium, Tucson, AZ
Transcript of Development of Cast Cure Explosives for Comp B Replacement · DLE-C054 is a promising composition...
A premier aerospace and defense company
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Development of Cast Cure Explosives for Comp B Replacement
Prepared by:Robert Hatch, Paul Braithwaite, Nathan Seidner, and Jim WrightATK Launch Systems
May 11-14, 2009NDIA IM/EM Technology Symposium, Tucson, AZ
A premier aerospace and defense company
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Outline
Two cast cure formulations developed:
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Formulation DLE-C054 (RDX, NTO, HTPB binder)
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Formulation DLE-C055 (RDX, TEX, HTPB binder)
Formulation Characterization
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Formulation and processing features
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Small scale sensitivity
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Subscale performance testing
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Subscale Insensitive Munitions testing
A premier aerospace and defense company
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Background
A replacement explosive for Comp B must meet the following objectives:
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Low Cost
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High Performance
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Castable, with good processing characteristics
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Respond well to IM threats of impact, cookoff, and sympathetic detonation
Potential advantages of cast cure versus melt pour formulations:
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Problems with volume changes due to phase changes avoided
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Rubbery nature of binder provides damage resistance and improves
response to impact events
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Cast cure charges usually contain low numbers of defects that can increase shock sensitivity
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Proven IM capabilities demonstrated in formulations such as PBXN-110 and PBXN-109
A premier aerospace and defense company
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DLE-C054 Formulation and Processing
Formulation
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HTPB binder system
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88% Solids
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Coarse RDX
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Coarse NTO (3-nitro-1,2,4-triazal-5-one)
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Fine RDX
Processing
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Viscosity minimized by adjusting ratio of coarse and fine RDX
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Excellent processing with end-of-mix viscosities from 7-12 kp
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Material flows easily through slit or hole plate when casting
A premier aerospace and defense company
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DLE-C054 Scale Up
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Made in ¼
pint, pint, 1-gallon, and 5-gallon mix sizes
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Scale up was straightforward with just slightly longer mix times
at larger mix sizes
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End-of-mix viscosity and processing was identical at each mix size
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Expected to scale easily to production 600-gallon mixers
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ATK Launch Systems has mix facilities capable of producing millions of pounds per year
A premier aerospace and defense company
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DLE-C054 Small Scale Sensitivity
Excellent sensitivity
DLE-C054 Sensitivity
Uncured Cured Class 5 RDX
ABL Impact (cm) – TIL 41 51 1.8
ABL Friction (lbs) – TIL ≥800 @ 8 ft/s ≥800 @ 8 ft/s 25 @ 6 ft/s
ABL ESD (J) - TIL 5.7 0.133 0.025
DSC Onset (°C) 221 216 219
A premier aerospace and defense company
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DLE-C054 Dent/Rate Tests
Two dent/rate tests performed•
LSGT Hardware (13.97 cm long by 3.65 cm diameter charge)Excellent performance•
Detonation velocity = 8.0 km/s (Comp B = 7.9 km/s)
Dent Depth (DLE-C054)
Dent Depth (Comp B)
Percentage of Comp B
0.398” 0.433” 92%
A premier aerospace and defense company
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DLE-C054 VCCT Testing
Variable Confinement Cookoff Testing Performed•
Heat rate = 6°F/hr
VCCT at heavy 0.12 inch confinement•steel sleeve in one piece •no fragmentation
VCCT
Wall Thickness (in.)
Reaction Temperature (ºF)
Result
0.030 342 burn 0.045 342 pressure rupture 0.075 341 pressure rupture 0.090 341 pressure rupture 0.120 341 deflagration
A premier aerospace and defense company
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DLE-C054 LSGT Testing
Large Scale Gap Testing Performed (8 tests)
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140 cards (compared to 201 for Comp B)
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Significant reduction in shock sensitivity compared to Comp B
140 150 145 142
141 140 139 139
A premier aerospace and defense company
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DLE-C055 Formulation and Processing
Formulation
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HTPB binder system
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88% Solids
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Coarse RDX
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Coarse TEX (4,10-dinitro-2,6,8,12-tetraoxa-4,10-diazatetracyclododecane)
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Fine RDX
Processing
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Viscosity minimized by adjusting ratio of coarse and fine RDX
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Excellent processing with end-of-mix viscosities from 7-11 kp
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Material flows easily through slit or hole plate when casting
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Made in ¼
pint, pint, and 1-gallon mix sizes
A premier aerospace and defense company
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Insensitive Energetic Material TEX
TEX
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4,10-dinitro-2,6,8,12-tetraoxa-4,10-diazatetracyclododecane
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Cheetah thermochemical
code theoretical performance a little better than NTO
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Has been manufactured in the past at ATK Launch Systems
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Not currently manufactured in large quantities in the US
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Synthesis starts with inexpensive materials –
has the potential to be reasonably low cost
Caged molecular structure results in high
density of 1.99 g/cc
A premier aerospace and defense company
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DLE-C055 Small Scale Sensitivity
Excellent sensitivity
DLE-C055 Sensitivity
Uncured Cured
A premier aerospace and defense company
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DLE-C055 Dent/Rate Tests
Dent Depth (DLE-C055)
Dent Depth (Comp B)
Percentage of Comp B
0.419” 0.433” 97%
Two dent/rate tests performed•
LSGT Hardware (13.97 cm long by 3.65 cm diameter charge)Excellent performance•
Detonation velocity = 7.7 km/s (Comp B = 7.9 km/s)
A premier aerospace and defense company
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DLE-C055 LSGT Testing
Large Scale Gap Testing Performed (6 tests)•
141 cards (compared to 201 for Comp B)•
Significant reduction in shock sensitivity compared to Comp B
A premier aerospace and defense company
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Summary and Conclusions
DLE-C054 is a promising composition for Comp B replacement
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Good performance
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Excellent shock sensitivity compared to Comp B
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Good small-scale slow cookoff
response
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Excellent processing characteristics
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Potentially low cost
DLE-C055 has features very similar to DLE-C054 but with improved performance
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However, a good commercial source of large quantities of TEX is not available at this time
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