Acoustic emission pattern: an indicator of mode of failure in geologic materials as affected by their natural imperfections
Two types of geologic materials, granite and coal, containing irregularities (different grain sizes and shapes in granite) and discontinuities (face and butt cleats in coal) were tested under different loading conditions. Deformation and acoustic emission characteristics of these materials under stress were recorded. In this study, for the first type of geologic material, beam specimens of approximately 4'' x 8'' x 2.5'' were prepared from four different types of granite namely, Honesboro Granite, Mason Granite, New Hampshire Pink, and Milford Pink. These were tested under constant loading rates according to the Standard Test Method for modulus of rupture of natural building stone. For the second type of geologic material, cylindrical specimens of coal were tested under a uniaxial compressive load at a constant rate of deformation. The tested coal specimens were from the Illinois number5 coal seam located in the Niantic Coal Field in southern Illinois. In both cases an MTS electrohydraulic loading system was used. Mode of failure in each material was characterized by the acoustic emission pattern and the results were substantiated by the deformation characteristics of the materials during failure.
- Research Organization:
- West Virginia Univ., Morgantown
- OSTI ID:
- 6726494
- Report Number(s):
- CONF-811036-
- Journal Information:
- Ser. Rock Soil Mech.; (United States), Vol. 8; Conference: 3. conference on acoustic emission/microseismic activity in geologic structures and materials, University Park, PA, USA, 5 Oct 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
COAL
ACOUSTIC EMISSION TESTING
FAILURE MODE ANALYSIS
GRANITES
DEFORMATION
FAILURES
FRACTURES
STRESSES
ACOUSTIC TESTING
CARBONACEOUS MATERIALS
ENERGY SOURCES
FOSSIL FUELS
FUELS
IGNEOUS ROCKS
MATERIALS
MATERIALS TESTING
NONDESTRUCTIVE TESTING
PLUTONIC ROCKS
ROCKS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TESTING
010600* - Coal
Lignite
& Peat- Properties & Composition
580100 - Geology & Hydrology- (-1989)