Uniaxial Compressive Response of M26A1E1 as a Function of Temperature

A joint Hercules-Olin M14 Replacement Program for the M865 round considered M26A1E1 gun propellant as a candidate replacement for the current M14 gun propellant. This report outlines the results of uniaxial compression tests on M26A1E1 propellant as a function of temperature, -40, -20, 20 and 50 deg...

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Bibliographic Details
Main Authors: Gazonas, George A, Leadore, Michael G
Format: Report
Language:English
Subjects:
Ammunition and Explosives
ASH80
AXIAL LOADS
BLISTERS
CHEMICAL COMPOSITION
COMPRESSION
COMPRESSIVE LOADS
COMPRESSIVE STRENGTH
COMPRESSIVE TESTING
CRACKS
DAMAGE
ELECTRON BEAMS
ELECTRON MICROSCOPY
ENERGY
FAILURE(MECHANICS)
FIBERS
FRACTURE(MECHANICS)
GUN PROPELLANTS
GUNS
M14
M26A1E1 GUN PROPELLANT
MECHANICAL PROPERTIES
NITROCELLULOSE
PE62618A
PROPELLANT FRACTURE
REPLACEMENT
STRAIN RATE
SURFACES
TEMPERATURE
TEST AND EVALUATION
UNIAXIAL LOADS
YIELD STRENGTH
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Summary:A joint Hercules-Olin M14 Replacement Program for the M865 round considered M26A1E1 gun propellant as a candidate replacement for the current M14 gun propellant. This report outlines the results of uniaxial compression tests on M26A1E1 propellant as a function of temperature, -40, -20, 20 and 50 degrees Celsius and constant strain rate, 100 sec I/s. The mechanical behavior of M26A1E1 is quantified using various mechanical response parameters such as yield stress, yield strain, compressive modulus, failure modulus, and absorbed energy density. In general, the mechanical behavior of M26A1E1 is more sensitive to temperature than M14. However, M26A1E1 is less susceptible to fracture damage than M14 over the temperature range -40 to 50 degrees Celsius. Scanning electron microscopy (SEM) of 'cold-fractured' surfaces of M26A1E1 reveal the presence of undissolved nitrocellulose (NC) fibers on the order of 20-58 micrometers. Some NC fibers 'pull-out' during the cold-fracture process and leave behind a depression in the propellant surface. The surface of the depression reacts with the electron beam at high magnification forming blisters and extensional cracks.