Cannon barrel life can be maximized by fully understanding the correlation between temperature and hoop stress and their relation to crack growth. Use of elevated temperature fatigue to predict failure of a gun barrel based on the number and type of rounds along with temperature data will both maximize the usable life of a cannon barrel and maintain a safe operating environment the men and women using these cannons. This analysis will help increase the usable life of large caliber cannon barrels; round data that is collected throughout the life of a cannon barrel will be used to determine the proper time to decommission the barrel. Experimental data was collected utilizing an MTS 858 fatigue system applying low cycle fatigue analysis. Numerous operating temperatures and stresses were calculated from various cannon round types and used to determine test parameters. From this data, a correlation was generated between stress and temperature to predict life expectancy of the test specimens. Several specimens were then cycled for various temperature and pressure combinations, thereby verifying the accuracy of the prediction model. Data was collected using methods set forth in ASTM E466-07 which dictates the standard practice for force-controlled fatigue testing. Data was analyzed using Minitab for development of the life cycle prediction model. Since the accuracy of the model dictates its reliability, this was used to provide a safety cushion to ensure that failure does not occur prior to the expected time.

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