mid-scale testing and simulation of fuze terminal ... · simulation of fuze terminal ballistic...

MidMid--Scale Testing and Scale Testing and Simulation of Fuze Terminal Simulation of Fuze Terminal Ballistic EnvironmentsBallistic Environments

Craig Doolittle and Drew Malechuk51st Annual Fuze Conference

Nashville, TN - May 22-24, 2007

Expanding the Realm of Possibility

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OverviewOverviewTest ObjectivesGun Test SetupTarget DesignRange and On-board InstrumentationReverse Ballistics TestingHigh-fidelity Finite Element Modeling ComparisonsHigh Speed Photo Data ReviewOn-board Data ReviewTest Data Comparisons with Pre-test Predictions

SAMPLL Test and Target Design CalculationsConclusions


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Test ObjectivesTest ObjectivesCollect high-quality deceleration time-history data during high-speed multi-layered, multi-material penetration events:

With multiple combinations of concrete layers of 0.2, 0.8, and 1.5 body lengths, thick soil layersmulti-body length voids

With lateral loading and angle of attack conditions (simulated with angle of impact)With angle of impact reversalsData suitable for calibrating high-fidelity computational modelsData suitable for validating SAMPLL (Simplified Analytical Model of Penetration with Lateral Loading) code, used for pretest test and target design


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Gun Test SetupGun Test SetupRange Instrumentation

Image Motion cameras used to determine impact attitude and velocityHigh-speed film and video cameras at various locations Crush gauges and Velocity screens


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Target Design Target Design -- MD 1MD 1--4 (2800 ft/sec)4 (2800 ft/sec)

PlywoodSabot

Stripper

ConcreteTargetBlocks

0.2, 0.8, 1.5 BL

Thick SoilPlywoodStopperBlocks

ConcreteStopperBlocks

NOT TO SCALE


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Target Design Target Design ––MD A & B MD A & B (2350 ft/sec)(2350 ft/sec)

NOT TO SCALE

PlywoodSabot

StripperPlywoodStopperBlocks


Multi-BLVoids (Air)

Concrete TargetBlocks

0.2, 0.8, 1.5 BL


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Target Design Target Design -- MD C (2350 ft/sec)MD C (2350 ft/sec)

PlywoodSabot



NOT TO SCALE

Thick Soil

Angle of Impact ReversalLateral LoadingConcrete Target

Blocks


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Target Design Target Design -- MD D (2350 ft/sec)MD D (2350 ft/sec)

PlywoodSabot



NOT TO SCALE

Angle of Impact ReversalLateral LoadingConcrete Target

Blocks

Multi-BLVoids(Air)


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Test Range: Energetic Materials Research and Test Range: Energetic Materials Research and Testing Center (EMRTC), Socorro, NMTesting Center (EMRTC), Socorro, NM


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Additional Recoil CapacityAdditional Recoil Capacity


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Barrel Clamps (one of three) Limit WhipBarrel Clamps (one of three) Limit Whip


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Muzzle Exit Crush GaugesMuzzle Exit Crush Gauges


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OnOn--board Data Packageboard Data Package

IES Model 64 Recorders

Battery Packs

Accelerometer Blocks

Solid Rod

Lock Rings

Lock Rings

Nose Plug


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Accelerometer block with mounted XAccelerometer block with mounted X--axis axis AccelerometerAccelerometer


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Accelerometer block with mounted YAccelerometer block with mounted Y--axis axis (or Z(or Z--axis) Accelerometeraxis) Accelerometer


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Accelerometer block with three XAccelerometer block with three X--axis axis Accelerometers in “L” ConfigurationAccelerometers in “L” Configuration


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Assembled Penetrator and SabotAssembled Penetrator and Sabot


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Sabot/Pusher Plate/Sabot/Pusher Plate/ObturatorObturator DesignDesignSystem Redesign


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LSLS--DYNA FEM ModelDYNA FEM Model

Sabot

NoseSupport

InstrumentLock Ring (2X)

Battery (2X) AccelerometerHousing (2X)

Penetrator

AccelerometerLock Ring (2X)

Recorder (2X)

Lock Ring

PusherPlate

Obturator

Housing


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Normal Impact Early TimelineNormal Impact Early Timeline

t = 0.00 ms

Penetrator nose contacts plywood.

t = 0.30 ms

Sabot pulls forward as penetrator slows down.

t = 0.48 ms

Sabot impacts plywood.


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Close Up of Sabot Close Up of Sabot –– Pusher Plate/Obturator Pusher Plate/Obturator Gap at 0.90 msGap at 0.90 ms


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Sabot Sabot –– Pusher Plate/Obturator Gap Closed Pusher Plate/Obturator Gap Closed at 1.06 msat 1.06 ms


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Normal impact with velocity contours in the Normal impact with velocity contours in the impact directionimpact direction

t = 0.00 ms

t = 0.30 ms

t = 0.48 ms

t = 0.80 ms

t = 1.06 ms

t = 1.36 ms


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2 degree AOA2 degree AOA

t = 0.00 ms

t = 0.30 ms

t = 0.56 ms

t = 0.80 ms

t = 1.06 ms

t = 1.36 ms


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Filtered Simulation Data Compared to Test Filtered Simulation Data Compared to Test (10 kHz low(10 kHz low--pass)pass)


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Reverse Ballistics Test Setup (615 lbs, 2000 ft/sec)Reverse Ballistics Test Setup (615 lbs, 2000 ft/sec)


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Gun Test Target SetupGun Test Target Setup


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Orthogonal Mirror showing Yaw Orthogonal Mirror showing Yaw MeasurementMeasurement


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MD B Image from Phantom 1MD B Image from Phantom 1


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MD D SetupMD D Setup


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MD D Image from Phantom 1MD D Image from Phantom 1


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Orthogonal Image Motion CompensationOrthogonal Image Motion Compensation


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Orthogonal IMC after PenetrationOrthogonal IMC after Penetration


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MD A Rear Accelerometer DataMD A Rear Accelerometer Data


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MD A Rear Accelerometer Data (Velocity)MD A Rear Accelerometer Data (Velocity)


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MD A Rear Accelerometer Data (Distance)MD A Rear Accelerometer Data (Distance)

0 .0 6 0 .0 65 0 .0 7 0 .0 7 5 0 .08 0 .08 5 0 .0 9 0 .0 9 5 0 .1 0 .10 5 0 .1 10

1 0 0

2 0 0

3 0 0

4 0 0

5 0 0

6 0 0

7 0 0

8 0 0M D A R e a r

Tim e (s ec )

Dis

tanc

e (in

)

Void

Gun E

xit

Void

Void

Plywood

Plywood

Concrete

Concrete

Concrete

Plywood

Concrete


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0.06 0.065 0.07 0.075 0.08 0.085 0.09 0.095 0.1 0.105 0.11-15000

-10000

-5000

0

5000

X A

ccel

erat

ion

(g)

Time (sec)

MD A Rear, passband = 1000 rp = 0.1 stopband = 2000 rs = 40

0.06 0.065 0.07 0.075 0.08 0.085 0.09 0.095 0.1 0.105 0.11-1000

0

1000

2000

3000

X V

eloc

ity (f

t/sec

)

MD A Rear Accelerometer Data (Overlay)MD A Rear Accelerometer Data (Overlay)

Void

Gun E

xit

Void

Void

Plywood

Plywood

Concrete

Concrete

Concrete

Plywood

Concrete


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Comparison of MD 1 & 2 Comparison of MD 1 & 2 AccelAccel and and VelVel DataData


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Penetrator Post ShotPenetrator Post Shot


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Comparison of Accelerometer Data to SAMPLLComparison of Accelerometer Data to SAMPLL

Final Resting Position of 38’ within 8”of SAMPLL Prediction!


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PatchedPlywood



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MD B Marked And Taped SabotMD B Marked And Taped Sabot

Initial Locationof Sabot Materialin Previous Image


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MD B Marked And Taped Sabot Fragment, MD B Marked And Taped Sabot Fragment, Turned Inside OutTurned Inside Out


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ConclusionsConclusionsSucceeded in collecting high-quality deceleration time-history data during high-speed multi-layered, multi-material penetration eventsTest data used to develop concrete model for LS-DYNAExcellent comparisons between LS-DYNA simulations and test dataExcellent comparisons between SAMPLL pretest predictions and test dataSuccessfully designed, engineered, and executed a complex test series, involving physics regimes at the edge of current understanding with a very high data recovery rate

mid-scale testing and simulation of fuze terminal ... · simulation of fuze terminal ballistic...

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