Nausheen Al-Shehab, Ernest L. Baker, Adam Enea: US ARMY ARDEC David Hunter, Larry Pitts, Karen Huddleston, Cody Anderson: GD-OTS Prepared for NDIA Insensitive Munitions & Energetic Materials Technology Symposium May 14-17 Las Vegas, NV TESTING OF AN IM UPGRADED M430A1 40 MM GRENADE May 2012 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited
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Nausheen Al-Shehab, Ernest L. Baker, Adam Enea: US ARMY ARDEC
David Hunter, Larry Pitts, Karen Huddleston,
Cody Anderson: GD-OTS
Prepared for
NDIA Insensitive Munitions &
Energetic Materials Technology Symposium
May 14-17
Las Vegas, NV
TESTING OF AN IM UPGRADED M430A1 40 MM GRENADE
May 2012
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited
Outline Upgraded 40mm Grenade
• Background
• Project Approach
• IM Testing of Baseline Warhead
• IM Design Configuration for Warhead
• IM Engineering Test Results – Overview
• Bare Warhead Slow Cook-off (SCO)
• Warhead Venting feature in simulated
Packaged SCO
• Warhead Venting - Hot Gun Launch
• Warhead Venting
Down-Selection Testing – FCO Results
• Conclusions
Fast Cook-Off
Slow Cook-off
Fragment Impact
Bullet Impact
Sympathetic Det
Environmental Packaging
Warhead Venting
Background - Project Approach
Multiple Technology Demonstration High Explosive Dual Purpose
Explosive
Barriers
Cart Case Venting
Multiple Technology Demonstration for M430A1 HEDP
Packaging Venting Warhead Venting IM Explosives
Comp A5
T1 = 44.59 us, T2 = 49.93 us, T3 = 55.23 us
Velavg = 6.684 mm/us
PBXN-5
PAX-46
Warhead
Venting
Cartridge
Case
Venting
HE Fill
Pkg
Multiple
Technology
Demo
Barriers
Integrated
System
Solution
Cartridge Venting Barrier Modeling
Background - Baseline &
Engineering Testing
When subjected to fast and slow cook-off
tests as defined in MIL-STD-2105C the
currently fielded 40mm M430A1 HEDP
Grenade reacts violently.
Baseline IM Response Projected IM Response
Tier II Munitions FCO SCO BI FI SR SCJ HC FCO SCO BI FI SR SCJ
40mm HEDP - M430A1 III I V I F F 1.1 (V) (V) (V) (IV) (P) (F)
40mm HEDP - M433 III I V I F F 1.1 (V) (V) (V) (IV) (P) (F)
Bare Warhead Engineering SCO Tests
Type II
Convection Oven
Circulating Fan
Power and
Thermocouple
Wiring
Pre Test
Make Switch for
High Speed Camera
M430 40mm
Thermocouples for
Round Temperature
Measurement
Medium
Caliber
Warhead
Project Objective:
Demonstrate Type V (Burning) Reaction when Integrated into 40mm M430A1
HEDP System
Demonstrate IM venting solution for High G gun-launched “smaller” ammunition
IM Venting Design Configuration
• IM vent design for M430A1 Grenade uses
a Melt Ring to Pass FCO and SCO
without Performance Reductions
• Various Melt Ring Materials Possess
Suitable Strength and Thermal Properties.
Plastic Selected for Demonstration
• Functions as Structural Load Bearing
Component during Gun Launch, Set
Back, Set Forward, and Spin.
• Melt Ring Releases Fuze and SC Liner
Allowing HE Fill to Vent Safely Resulting
in Type V (Burning) Reaction when
Subjected to Elevated Temperatures that
would Normally Cause Detonation
IGNITION! LINER MOVES
Confined Unconfined
Case Band OgiveSC Liner Spitback
Escapement
Top PlateAssembly
Bottom Plate
Comp A-5
Melt Ring
Engineering Test Results
Overview
• Successful 6 SCO tests (bare projectiles) at 6F/h resulted
in Type V (All Melt Ring Materials)
• Successful SCO test (simulated packaging) at 6F/h