Rock Spalling through Electrohydraulics.
Rept. for Jul 74-Jun 75,
CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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This report describes theoretical and experimental efforts to spall rock using high-pressure, short-duration stress pulses created by electrohydraulic discharges. An electrohydraulic power supply with a maximum voltage capability of 17,000 volts and a capacitance of 45 microfarads was used. Specimens were granite cylinders 15 inches 38 cm in diameter by 18 inches 46 cm high. The spalling concept consisted of creating a compressive stress pulse at an axial hole in the cylinder, and spalling the specimen when the pulse is reflected as a tensile wave at the outer surface of the cylinder. The tests indicated that the electrohydraulic equipment as it was utilized in these tests was not powerful enough to spall the granite specimens. The analytical efforts indicated that the spalling concept is feasible if the proper stress pulse shape is obtained a method for estimating the necessary pulse shape parameters is presented. Author
- Geology, Geochemistry and Mineralogy
- Electricity and Magnetism