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| Titel |
The correlation of electrical charge with strain on stressed rock samples |
| VerfasserIn |
D. Triantis, C. Anastasiadis, I. Stavrakas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 6 ; Nr. 8, no. 6 (2008-11-24), S.1243-1248 |
| Datensatznummer |
250005895
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| Publikation (Nr.) |
 copernicus.org/nhess-8-1243-2008.pdf |
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| Zusammenfassung |
Laboratory experiments on rock samples have shown electric signal emissions
when the samples are subjected to temporal stress increase especially when
the samples approach failure. These electric signals are attributed to the
generation and propagation of microcracks that guide the sample to
mechanical failure.
In this work the temporal evolution of electric charge release is studied
for marble samples subjected to stress at a constant rate up to fracture and
it is correlated to the respective recordings of the yielded strain.
The results exhibit a systematic linear correlation between electric charge
and deformation, with a constant proportionality factor independent of
stress rate magnitude. This linear correlation, which is in accordance with
the Moving Charged Dislocations (MCD) model, exists from the instant that
the marble samples are driven to the non-linear region of mechanical
behaviour due to the applied stress, and more precisely to the Crack
Propagation Zone (CPZ) up to the pre-failure phase. |
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