Accession Number : ADA262365


Title :   Uniaxial Compressive Response of M26A1E1 as a Function of Temperature


Descriptive Note : Final rept. Feb-May 92


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD


Personal Author(s) : Gazonas, George A ; Leadore, Michael G


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262365.pdf


Report Date : Feb 1993


Pagination or Media Count : 43


Abstract : 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.


Descriptors :   *COMPRESSIVE STRENGTH , *GUN PROPELLANTS , TEST AND EVALUATION , COMPRESSION , TEMPERATURE , FIBERS , MECHANICAL PROPERTIES , DAMAGE , CRACKS , ENERGY , FRACTURE(MECHANICS) , STRAIN RATE , CHEMICAL COMPOSITION , ELECTRON MICROSCOPY , SURFACES , ELECTRON BEAMS , REPLACEMENT , YIELD STRENGTH , GUNS , FAILURE(MECHANICS) , AXIAL LOADS , NITROCELLULOSE


Subject Categories : Ammunition and Explosives


Distribution Statement : APPROVED FOR PUBLIC RELEASE