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Dynamic Properties of Rock Required for Prediction Calculations.
Final rept. 28 Feb 74-27 Aug 75,
STANFORD RESEARCH INST MENLO PARK CALIF
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Dynamic loading - unloading experiments were performed on rhyolite from the Nevada Test Site. Impact stresses ranged from about 6 to 18 kbar. Multiple embedded gages recorded particle velocity-time histories in each experiment. Lagrange analysis methods were used to calculate loading and unloading paths from the gage records. Three waves were recorded in the rhyolite. The first wave is the Hugoniot elastic precursor. Although there is uncertainty of the source of the second wave, it is suggested that it is a quasi-shear wave coupled to the longitudinal stress wave. This coupling results from the banding in the rhyolite being inclined in the direction of the stress wave propagation. Data on Mt. Helen tuff, Indiana limestone, Essex soil, and Mixed Company sandstone taken from other sources are included in this report. Several key features that apply to the development of computational models are noted and conclusions are drawn from the data.
APPROVED FOR PUBLIC RELEASE