ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
A series of uniaxial-compression tests were conducted on some representative brittle rockspecimens, such as granite, marble and dolerite. A multi-channel, high-speed AE signal acquiringand analyzing system was employed to acquire and record the characteristics of AE events anddemonstrate the temporal and spatial distribution of these events during the rupture-brewingprocess. The test result showed that in the primary stage, many low amplitude AE events weredeveloped rapidly and distributed randomly throughout the entire specimens. In the second stage,the number of AE increased much slower than that in the first stage, while the amplitude of mostAE events became greater. Contrarily to the primary stage, AE events clustered in the middle areaof the specimen and distributed vertically conformed to the orientation of compression. The mostdistinct characteristic of this stage was a vacant gap formed approximately in the central part of thespecimen. In the last stage, the number of AE events increased sharply and their magnitudeincreased accordingly. The final failure location coincidently inhabited the aforementioned gap. Themain conclusion is that most macrocracks are developed from the surrounding microcracks existedearlier and their positions occupy the earlier formed gaps, and the AE activity usually becomesquite acute before the main rupture occurs
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.567.pdf
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