The Mechanical Loads from LSD Waves and Their Simulation. Volume I. Analysis and Pressure Measurements.
STANFORD RESEARCH INST MENLO PARK CALIF
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Two new analyses have been developed to predict the surface loads produced by a laser supported detonation LSD. The first analysis is based on the self-similar theory of expanding blast waves and is very simple to use. It is recommended for systems studies of target damage. The second is a combination of the method of characteristics and self-similar blast wave analysis and provides a more accurate picture of the plasma expansion process. Both models predict pressure pulse and impulse intensity distributions on the target surface with more realistic shapes than those predicted by the model of Pirri. Measurements of surface pressure inside the laser spot show that the pressure histories are close to those predicted by the more complete theory, but with a more rapid decay. This difference between analyses and experiment is attributed to the complex beam profile and pulse shape in the experiments and the comparable uncertainty in measuring laser energy. Analysis of the LSD explosive simulation technique ESD showed that it is possible to model both near field and far field effects in the same experiment. However, if near field loads are simulated precisely, far field loads will be 25 percent lower than those of an LSD.
- Plasma Physics and Magnetohydrodynamics