Dynamic Tensile Failure in Rocks

The results of a two-year program on dynamic fracture behavior of rocks are described. The goal was to develop the capability to predict the fragment size distribution of rock resulting from known dynamic loads. This goal has been largely realized for a simple, well-characterized rock type, Arkansas...

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Bibliographic Details
Main Authors: Shockey, Donald A, Petersen, Carl F, Curran, Donald R, Rosenberg, John T, Seaman, Lynn
Format: Report
Language:English
Subjects:
COMPUTER AIDED ANALYSIS
CRACKS
DYNAMIC LOADS
FRACTURE(MECHANICS)
FRAGMENTATION
Geology, Geochemistry and Mineralogy
LOADS(FORCES)
MATHEMATICAL MODELS
NOVACULITE
PARTICLE SIZE
ROCK
ROCK MECHANICS
STRESSES
TENSILE PROPERTIES
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Summary:The results of a two-year program on dynamic fracture behavior of rocks are described. The goal was to develop the capability to predict the fragment size distribution of rock resulting from known dynamic loads. This goal has been largely realized for a simple, well-characterized rock type, Arkansas novaculite, under one-dimensional-strain impact loading. A gas gun was used to accelerate flat plates against flat rock specimens. Ytterbium piezoresistive stress gages were used to measure stress histories, and the dynamic tensile strength and fragment size distributions were determined. The mechanism of fragmentation was deduced from fractographic observations on impacted specimens.