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:
AE technique is proved a efficient tool for real-time monitoring of the crack initiation andpropagation during rock failure process under uniaxial compression condition. In this paper, An AEsystem was employed to investigate the crack propagation and failure modes of three groups ofgranite specimens (80mm×100mm×170mm) with the same pre-existing crack. The AE sensors can besurface mounted. By using a Geiger location algorithm, AE event location can be determined bytime-of-arrival times. The propagation velocities of p-wave or s-wave of granite samples weremeasured. Experiments on pre-existing crack propagation of granite samples were carried out on thepress machine. From the testing result, failure mode of three kinds of granite samples was mainlyshear failure, while the secondary crack propagated slowly and could not influence the failure mode ofgranite sample. By surveying the relation of accumulative AE events and stress-strain curve, AEactivity represents different characters with stress-strain changing during the total loading process,microcracking contributing to fracture propagation with strain corrosion. AE location result reflectedcrack initiation and propagation, which is of great importance in studying rock instability andpredicting rock failure mode
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2329.pdf
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