No abstract

No abstract

No abstract

UNCLASSIFIED 15«. DECLASSIFI CATION/DOWN GRADING SCHEDULE 16. DISTRIBUTION STATEMENT fo/tM« Report Approved for public release; distribution unlimited. 17. DISTRIBUTION STATEMENT (ot the abstract entered In Block 20, It dltterent from Report) 18. SUPPLEMENTARY NOTES 19. KEY WORDS (Continue on revetme aide If necaaeary and Identity by block number) Gun wear and erosion Stargauge 90 mm Guns 105 mm Guns 155 mm Guns 20. ABSTRACT (Canttaua an. r*ir«m •£*» ft rraceeeary and Identity by block number) raj A common technique to assess wear is to measure loss from a nozzle exposec to propellant combustion gases. Recent experiments in separate laboratories have rated that the scatter from the mass losses recorded for a series of shot! with the same propellant is well outside experimental error. This suggests the scatter in data reflects the actual wear process itself and that understanding why the wear process seems erratic should be a key feature of any model of gun barrel wear, if such scatter is also characteristic of wear in guns.

No abstract