Experimental Investigation of Fracture of Granite under Compression
Final rept. 10 Mar-20 Dec 1971
TRW SYSTEMS GROUP REDONDO BEACH CA ADVANCED TECHNOLOGY STAFF GROUP
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The applicability of laser holographic interferometry to study the deformations of geologic materials under applied stresses was investigated. Two types of geologic materials were studied - Jasper Quartzite and Charcoal Granite. Two holographic interferometry techniques were employed. Double exposure holographic interferometry was used to study and record the deflections of the specimens from 0 psi to near-fracture. Data from the double exposure holograms provided radial and axial displacements along the length of the specimens. A computer program was utilized to deduce the radial and axial strains from the holographic data. Stored beam holographic interferometry was used together with high speed motion picture photography to record the deflections of the specimens from near-fracture to fracture.
- Geology, Geochemistry and Mineralogy