ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
The work is devoted to the problem of role of ambient factors (external electromagneticfield, in particular) in the process of ageing of mechanically burden nonmetallic solids (rocks). Aspecific research point is the effect of temporary activation of Acoustic Emission (AE) of rocksspecimens during action of EM field pulses applied externally. Extended experimental studies ofresponses of AE have been conducted to evince the changes in defects accumulation process inloaded specimens due to external power impacts (EPI). The experiments have been held onnoiseless rheological machines available at Bishkek Geodynamic Research Center - RS RAS. Wehave tested a number of specimens made of different materials and analyzed the temporaldependence of AE activity during exposure in electric field and crossed electric and magnetic fields;the compressive load being constant. The effect of AE stimulation by power pulses (triggering) hasbeen verified. The obtained results allow to distinguish two kinds of AE activation. The first kindinvolves simultaneous well correlated growth of numbers of minor and major AEs (so-called selfconsistencyof temporal plots of activity of different range acoustic events). The second kindrepresents dissimilar variations: the increment of activity of minor energy AEs, but the decrementof those of major energy. The first kind of solids material responses to EPI is prevailing when thecompressive loads is under 0,85 of fracturing value. The episodes of dissimilar AE responses maysignify that electromagnetic control of defects accumulation process inside rocks is possible, inprinciple
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.137.199.pdf
