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A small-scale experiment using microwave interferometry to investigate detonation and shock-to-detonation transition in pressed TATB

Renslow, Peter J. M.S.A.A., Purdue University, August 2014. Small-Scale Experiment using Microwave Interferometry to Investigate Shock Initiation, Failure, and Transient Reactive Waves in Pressed TATB. Major Professor: Steven F. Son, School of Aeronautics and Astronautics (by courtesy). A small-scale characterization test utilizing microwave interferometry was developed to dynamically measure detonation and run to detonation distance in explosives. The technique was demonstrated by conducting two experimental series on the well-characterized explosive triaminotrinitrobenzene (TATB). In the first experiment series, the detonation velocity was observed at varying porosity. The velocity during TATB detonation matched well with predictions made using CHEETAH and an empirical relation from the Los Alamos National Laboratory (LANL). The microwave interferometer also captured unsteady propagation of the reaction when a low density charge was near the failure diameter. In the second experiment series, Pop-plots were produced using data obtained from shock initiation of the TATB through a polymethyl methacrylate (PMMA) attenuator. The results compared well to wedge test data from LANL despite the microwave interferometer test being of substantially smaller scale. The results showed the test method is attractive for rapid characterization of new and improvised explosive materials.