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- W2016032222 abstract "Detonating explosives were used to induce high intensity stress waves in geologic materials. The method of loading the sample materials involved emplacing a cylindrical explosive charge in contact with one end of the specimen. To observe the wave propagation phenomena, the slit of a high speed streak camera was aligned with the axis of the explosive and geologic sample. A series of gridlines painted on the surface of the specimens enabled clear observation of stress wave propagation and subsequent material motion. The decay of peak stress along the axis of the loaded sample and the ability to simultaneously determine the volumetric strain levels provided a unique method of obtaining a complete dynamic stress-strain curve on each experiment. The experimental data were taken on 5 rock types having a wide range of mechanical properties. The observed stress wave intensities were in the range from 1 to 50 kilobars. The strain amplitudes were from 0.6 to 25 percent. The characteristic impedance of the rocks studied varied between 2.2 and 11.4 megarayls. The detonation impedances of the explosives used were 7.7 and 13.3 megarayls. In some cases, the observed wave travelled slower than the statically determined elastic wave speed, indicating plastic wave propagation. The information provided by this high speed photographic method is useful in understanding the initial material behavior of the dynamic stress wave propagation induced in rock media from detonating explosives." @default.
- W2016032222 created "2016-06-24" @default.
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- W2016032222 date "1989-06-07" @default.
- W2016032222 modified "2023-09-26" @default.
- W2016032222 title "Dynamic Stress-Strain Measurements By High Speed Streak Photography" @default.
- W2016032222 doi "https://doi.org/10.1117/12.969242" @default.
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