Pressure stimulated currents (PSC) technique

dc.contributor.author	Σταύρακας, Ηλίας	el
dc.contributor.author	Αναστασιάδης, Κίμων	el
dc.contributor.author	Τριάντης, Δήμος Α.	el
dc.contributor.author	Βαλλιανάτος, Φίλιππος	el
dc.date.accessioned	2015-04-26T17:01:09Z
dc.date.available	2015-04-26T17:01:09Z
dc.date.issued	2015-04-26
dc.identifier.uri	http://hdl.handle.net/11400/9002
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.source	https://www.egu.eu/	en
dc.subject	Weak electric currents
dc.subject	Preseismic electric signals
dc.subject	Damages
dc.subject	Ασθενής ηλεκτρικά ρεύματα
dc.subject	Προσεισμικές ηλεκτρικά σήματα
dc.subject	Βλάβες
dc.title	Pressure stimulated currents (PSC) technique	en
heal.type	conferenceItem
heal.secondaryTitle	a review	en
heal.classification	Technology
heal.classification	Electrical engineering
heal.classification	Τεχνολογία
heal.classification	Ηλεκτρολογία Μηχανολογία
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85133147
heal.classificationURI	http://zbw.eu/stw/descriptor/18426-4
heal.classificationURI	N/A-Τεχνολογία
heal.classificationURI	N/A-Ηλεκτρολογία Μηχανολογία
heal.language	en
heal.access	free
heal.publicationDate	2009-04
heal.bibliographicCitation	Stavrakas, I., Anastasiadis, C., Triantis, D.A. and Vallianatos, F. (2009) Pressure stimulated currents (PSC) technique: a review, In: European Geosciences Union General Assembly 2009, Vienna, Austria, 19–24 April 2009. [online]. 11. p.8732. Available from: https://www.egu.eu/	en
heal.abstract	Weak electric currents appear when brittle materials are subjected to mechanical stress of various modes. The Pressure Stimulated Currents technique has been introduced to investigate the underlying physical mechanisms that dominate this phenomenon. A potential theoretical model which is known as Moving Charged Dislocations model is evaluated using the Pressure Stimulated Currents technique. According to this model the emitted electric currents are directly related to the imperfections in the bulk of the material that either pre-exist or are created and develop due to the externally applied stress. In this work an attempt is made to summarize the experimental results and the conclusions of the Pressure Stimulated Currents technique which has been applied to a collection of brittle materials like marble and amphibolite and construction materials like cement paste and mortar. The electric current is recorded in three bounded stress ranges while stress is applied in different modes. The first range is limited to stress levels low enough to be inadequate to create significant bulk damages. In the second range the applied stress is adequate to create damages in bulk of the material. The third range is in the vicinity of fracture. The form and the magnitude of the recorded electric current vary depending on the level of the applied stress. The experimental results manifest a strong relation of the electric current to both the applied stress and stress rate as well as on the yielded strain. When the Young's modulus of the material becomes smaller due to the significant irreversible damage processes the weak electric current recordings become intense and a linear relation between the released electric charge and the mechanical strain is observed. In the vicinity of fracture, the form of the emitted current is characteristic and it is related to the mode of fracture of the sample while deviations from the linearity are observed. The Pressure Stimulated Currents technique can give a very useful bundle of information about the health of the material sample for each stage of mechanical stress. If appropriate predetermined mechanical triggering is applied through the stress application, this technique can prove to be a fine method for the evaluation of the damages magnitude in a sample. Furthermore the experimental results describe a solid ground that could interpret observed preseismic electric signals.	en
heal.publisher	European Geosciences Union	en
heal.fullTextAvailability	true
heal.conferenceName	European Geosciences Union General Assembly 2009	en
heal.conferenceItemType	abstract