Time-Resolved Stress Measurements in Projectile Impacts: 2-D Loading.
WASHINGTON STATE UNIV PULLMAN SHOCK DYNAMICS LAB
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Experimental developments are reported that demonstrate the feasibility of using miniature optical stress sensors to determine the target response in 2-D loading situations arising due to projectile impacts. Oriented ruby chips embedded in aluminum and marble targets, at locations directly underneath rod impactors, were used to obtain time resolved, in-situ measurements. Time resolution approx. 100 ns and durations approx. 6 us reported here are intended to be representative and can be varied depending on the experimental requirements. Given the importance of obtaining in-situ, stress histories in targets subjected to 2-D dynamic loading, future work needs to address the development of analytic procedures to permit accurate and efficient inversion of the sensor output.