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ONR’s Advanced Gun Barrel Technologies Program. Michael Hermanson United Defense L.P. Minneapolis, MN (763)572-4759 [email protected] AGBT Background. A five-year program funded by the Office of Naval Research as part of Time Critical Strike Future Naval Capabilities (FNC)

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Onr s advanced gun barrel technologies program l.jpg

ONR’s Advanced Gun Barrel Technologies Program

Michael Hermanson

United Defense L.P.

Minneapolis, MN

(763)572-4759

[email protected]


Agbt background l.jpg

AGBT Background

  • A five-year program funded by the Office of Naval Research as part of Time Critical Strike Future Naval Capabilities (FNC)

  • Program supported by PMS500, DD(X) Program Office, for transition into Advanced Gun System (AGS) Program upon successful completion of defined transition criteria

SPONSORS/PERFORMERS:

PerformerName / Organization

Principal InvestigatorsAmir Chaboki / United Defense

Rodney Hubbard / NSWC/DD

S&T Program OfficerPeter Morrison / ONR 351

Project OfficerJoe McPherson / PMS 500


Advanced gun barrel technologies l.jpg

Advanced Gun Barrel Technologies

  • Objectives

  • - Identify & develop Gun Barrel Technologies that enable upgrades to existing barrel capabilities for Naval gun propulsion missions

    • Increased Gun Barrel Erosion & Fatigue Life

    • Improved Gun Barrel Thermal and Ballistic Performance

    • Reduced Life Cycle Cost

  • Payoffs

  • - Increased Gun System Availability

  • - Improved Ballistic Capability (Higher KE for increased range)

  • - Lower Life Cycle Cost

  • Technologies

  • - Refractory Barrel Materials / Coatings

  • - Composite Materials & Manufacturing Technology

  • - Advanced Integrated Barrel Design


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Transition Criteria

1 - Compliance with AGS Interface Control Document (ICD)

2 - Equivalent Ballistic Performance to Baseline AGS Barrel

3 - 50% Improvement in Barrel Life Over Baseline AGS Barrel

4 - Reduced Life Cycle Cost Compared to Baseline AGS Barrel

5 - Production and Gun Fire Testing of Full-scale Prototype


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Screening Evaluations

Vendor A Screening Test

Design and Fabricate Subscale Prototype

Vendor B Screening Test

Downselect

To 2

Vendor C Screening Test

Vendor D Screening Test

Vendor E Screening Test

Chrome Barrel Test

Subscale Competition/Demo

Design and Fabricate 155mm Prototype

Vendor X Barrel Test

Downselect

To 1

Vendor Y Barrel Test

Chrome Barrel Test

155mm Proof & Demo Tests

Transition Technology to DD(X)

Program

Success

Refractory Barrel Proof

Refractory Barrel Demo

Technical Approach


Candidate coating technologies l.jpg

Electroless Nickel-Boron

Coaxial Energetic Deposition

Catalytic plating process produces extremely uniform coating even on complex geometries

Plasma arc rotates around center conductor and travels along its length depositing material

Solid Free-Form Fabrication

Cylindrical Magnetron Sputtering

Explosive Cladding

Electromagnetically Enhanced Physical Vapor Deposition

Engineered material is created by alloying of powdered and/or wire-fed metals

Material is sputtered, from a coaxial target, uniformly over the inside diameter of the barrel

Tube of cladding material is mechanically bonded with the gun barrel in a collision driven by an explosive detonation

Electrically controlled magnetic fields enhance the plasma environment of the physical vapor

Candidate Coating Technologies


Test approach l.jpg

Test Approach

  • Tests must maintain traceability to the objective AGS environment

  • Parameters of the objective environment to be matched

    • Thermal profile through coating and near bore

      • Best match of temperature effects and thermal stress

    • Chemical environment of propellant with bore

      • Best match of chemical attack on bore surface

    • Mechanical stresses

      • Best match of stresses in coating and at interface


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Screening Test Fixture

  • Objective

    • Provide similar thermal, chemical and mechanical conditions to AGS barrel with reasonable cost

  • Approach

    • Design a new gun fixture using interior ballistics analysis to drive the configuration through the predicted thermal response rather than conventional parameters such as muzzle velocity and chamber pressure


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45mm Test Fixture

45mm/67 caliber smoothbore barrel

7.4 kg projectile

45mm Rifled Test Insert

3.0 liter chamber

45mm gun in place at UDLP test range


Test insert l.jpg

Test Insert

  • Test insert used to evaluate the performance of advanced coating materials

  • Insert includes shot start region and first few calibers of projectile travel

  • Thickness sized to provide a strain level similar to the 155mm barrel at maximum service pressure conditions

  • Insert does not simulate compressive residual stress from autofrettage in the large caliber barrel

No twist rifling


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Equilibrium Products

(with chrome)

Equilibrium Products

(with Tantalum)

M30A1

N2

CO

H2O

CO2

H2

Cr2O3 (S)0.73%

KOH

H2S

NH3

COS

N2

CO

H2O

CO2

H2

Ta2O5 (S)0.61%

KOH

H2S

NH3

COS

NC1258

NG

NQ

EC

KS

Ethanol

Graphite

Hybrid Propellant

CO

N2

CO2

H2O

H2

CH4

Ta2O5 (L)0.61%

NH3

HCN

C2H4

CO

N2

CO2

H2O

H2

CH4

Cr2O3 (S)0.73%

NH3

HCN

C2H4

NC1280

NG

DBP

DPA

G59

H2O

Ethanol

C

M30A1 & Hybrid Equilibrium Analysis

When reacted in the presence of chrome or tantalum, the M30A1 and the hybrid propellant produce the same products, in the same quantities


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Strain Due to Firing Loads

Strain response to firing loads is a good match with predicted behavior

Large Caliber Strain


Thermal results l.jpg

Maximum Temperature Near Bore

Thermal Results


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Unfired Sample

57 Firings

Chrome Plating

Heat Affected Zone

Heat Check Cracks

Chrome Plated Baseline Evaluation


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Current Status

  • Screening evaluation testing is complete

    • Performed 50 shot test series on chrome plated sample for baseline

    • 50 shots each on six different technologies

    • Materials analysis of test samples is in process

  • Source selection process for 76mm barrel development underway

    • Selection will be based on performance in screening test, proposal evaluation and past performance on similar projects


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Path Forward

  • Select participants in 76mm development phase and award subcontracts

    • Over the next 18 months we will design and build prototype barrels for the Mk 75 76mm gun mount and test them in rapid fire mode

    • Effort will also include preliminary design work for 155mm barrel


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