Cannon Coating Erosion Model With Updated M829E3 Example

The cannon coating erosion model is necessary since most current/future cannons will require a refractory metal bore coating. Coated cannon bore erosion does not simply proceed in a outward to inward ablative fashion due to coating spalling. Typical firing induced cannon erosion sequentially include...

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Bibliographic Details
Main Author: Sopok, S
Format: Report
Language:English
Subjects:
Ammunition and Explosives
ANTITANK AMMUNITION
BLOOD PLATELETS
BORES
COATING SPALLING
Coatings, Colorants and Finishes
CODING
CRACKS
DEGRADATION
EROSION
EXPERIMENTAL DATA
EXPOSURE(GENERAL)
GASES
GUNS
HIGH EXPLOSIVE AMMUNITION
INTERFACES
Mechanics
Metallurgy and Metallography
NAVAL GUNS
PREDICTIONS
REFRACTORY COATINGS
REFRACTORY METALS
SHRINKAGE
SPALLATION
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Summary:The cannon coating erosion model is necessary since most current/future cannons will require a refractory metal bore coating. Coated cannon bore erosion does not simply proceed in a outward to inward ablative fashion due to coating spalling. Typical firing induced cannon erosion sequentially includes heat check cracking of the refractory metal coating, coating shrinkage leading to progressive widening of these cracks, combustion gas induced interface degradation of the exposed substrate metal, interfacial spalling of refractory metal coating platelets due to linked interfacial degradation which forms pits, and subsequent substrate metal gas wash to erosion condemnation. The purpose of this paper is to review typical cannon erosion mechanisms, highlight the resultant cannon coating erosion model, show how this very critical coatings model incorporates into our overall cannon erosion code (CEC), and provide an example. This example is an updated erosion prediction for the experimental non-ablative M829E3 kinetic energy tank round which puts the program just shy of its 180 round target. In addition, this example is for both HEAT type rounds which alter the M829E3 erosion pattern and the absence of these HEAT type rounds. This cannon coating erosion model correlates very well with laboratory/firing data and has been used for three years on a number of important Army and Navy gun systems.