STRESS-TIME MEASUREMENTS IN HIGH VELOCITY IMPACT
UTAH UNIV SALT LAKE CITY HIGH VELOCITY LAB
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A new method for the measurement of stress-time effects in high velocity impact is outlined. A technique for mounting small barium titanate piezoelectric transducers within semi-infinite aluminum targets is described. The targets are impacted by spherical projectiles of the same material as the target. The projectiles were accelerated to velocities ranging from approximately 0.1 kmsec to 2.0 kmsec. The electronic circuitry developed to acquire information from the transducing elements is presented. The use of isotropic elastic theory in the analysis of the data thus obtained demonstrates that the experimental technique is, in fact, a suitable method for the measurement of these phenomena. It is demonstrated that the method will give significant information about wave propagation and stress levels in elastic and plastic waves. Further application of the system should provide more satisfactory information about the intricate, but still largely unknown, processes which attend the formation of craters in semi-infinite targets.
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