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A study was undertaken to determine the optimum sensing device for measuring the bore strain of a gun tube during rapid firing. The hostile environment that exists within the gun tube and the general operational requirements of the gun tube place severe requirements on any system considered. After consideration of a number of systems and a systematic rating of each, two were selected for detailed study. These were a flash x-ray system and a dual path acoustical interferometer system which was devised as a result of this project. Although neither system was found to be suitable over the entire range of gun tube geometrics and operational conditions, the dual path acoustical interferometric is recommended as the most suitable system. (Author)

A study was undertaken to determine the optimum sensing device for measuring the bore strain of a gun tube during rapid firing. The hostile environment that exists within the gun tube and the general operational requirements of the gun tube place severe requirements on any system considered. After consideration of a number of systems and a systematic rating of each, two were selected for detailed study. These were a flash x-ray system and a dual path acoustical interferometer system which was devised as a result of this project. Although neither system was found to be suitable over the entire range of gun tube geometrics and operational conditions, the dual path acoustical interferometric is recommended as the most suitable system. (Author)

The propagation of high-intensity stress waves in cylindrical geometries is considered as a means to obtain a measure of the shear stress effects on material behavior. A discontinuity theory is applied to show that when Hugoniots are used as equations of state, the Hugoniots must necessarily coincide for all geometric configurations. It is also shown that the simple equations of state of this type may accurately predict particular information that does not depend on the shear properties of the material but that little evidence exists to permit its use in a general fashion for dynamic problems. A criterion is proposed for hydrodynamic behavior, and the parameters controlling this behavior are given. A technique to check the validity of proposed equations of state using flash radiography is also suggested. (Author)