About: Experimental Study of Micro-Cracks in Composites under Mechanical Stress

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Mechanical stress of specimens results in generation of micro-cracks whose walls bear electric charges of opposite sign. The crack walls are executing damped oscillations thus giving rise to electric charge oscillations. The charge movement induces electric potentials in electrodes, which are applied to the specimen. These electric potentials are amplified to be subsequently processed in a PC. An acoustic emission signal, which is due to the crack generation, is measured at the same time. The acoustic and electromagnetic signals are shifted in time against each other in consequence of the different wave propagation velocities. The time shift is also influenced by the acoustic sensor’s distance from the crack location. Our measurements were carried out in EXTREN composite, a building industry material. The measurement results are in a good agreement with the current theory of electromagnetic emission from mechanically stressed materials. Mechanical stress of specimens results in generation of micro-cracks whose walls bear electric charges of opposite sign. The crack walls are executing damped oscillations thus giving rise to electric charge oscillations. The charge movement induces electric potentials in electrodes, which are applied to the specimen. These electric potentials are amplified to be subsequently processed in a PC. An acoustic emission signal, which is due to the crack generation, is measured at the same time. The acoustic and electromagnetic signals are shifted in time against each other in consequence of the different wave propagation velocities. The time shift is also influenced by the acoustic sensor’s distance from the crack location. Our measurements were carried out in EXTREN composite, a building industry material. The measurement results are in a good agreement with the current theory of electromagnetic emission from mechanically stressed materials. (en)
Title	Experimental Study of Micro-Cracks in Composites under Mechanical Stress Experimental Study of Micro-Cracks in Composites under Mechanical Stress (en)
skos:prefLabel	Experimental Study of Micro-Cracks in Composites under Mechanical Stress Experimental Study of Micro-Cracks in Composites under Mechanical Stress (en)
skos:notation	RIV/00216305:26220/04:PU44714!RIV11-MSM-26220___
http://linked.open...avai/riv/aktivita	P V Z
http://linked.open...avai/riv/aktivity	P(GA102/03/0621), P(GP102/02/D073), V, Z(MSM 261100007), Z(MSM 262200022)
http://linked.open...vai/riv/dodaniDat	2011
http://linked.open...aciTvurceVysledku	Koktavý, Pavel Koktavý, Bohumil
http://linked.open.../riv/druhVysledku	D - Článek ve sborníku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoké učení technické v Brně / Fakulta elektrotechniky a komunikačních technologií
http://linked.open...dnocenehoVysledku	563751
http://linked.open...ai/riv/idVysledku	RIV/00216305:26220/04:PU44714
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Electromagnetic Emission, Composite, Micro-Crack, Electric Charge (en)
http://linked.open.../riv/klicoveSlovo	Composite Micro-Crack Electromagnetic Emission Electric Charge
http://linked.open...ontrolniKodProRIV	[D2E2EC4F893F]
http://linked.open...v/mistoKonaniAkce	Spindleruv Mlyn
http://linked.open...i/riv/mistoVydani	Praha
http://linked.open...i/riv/nazevZdroje	DEFEKTOSKOPIE 2004
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Irreversible processes in insulating materials for high temperature Cracks detection in solids by means of electromagnetic emission
http://linked.open...UplatneniVysledku	2004
http://linked.open...iv/tvurceVysledku	Koktavý, Pavel Koktavý, Bohumil
http://linked.open...vavai/riv/typAkce	WRD - Světová
http://linked.open.../riv/zahajeniAkce	2004-11-03 (xsd:date)
http://linked.open...n/vavai/riv/zamer	http://linked.opendata.cz/resource/domain/vavai/zamer/MSM%20261100007 http://linked.opendata.cz/resource/domain/vavai/zamer/MSM%20262200022
number of pages	8 (xsd:int)
http://purl.org/ne...btex#hasPublisher	Czech Society for Nondestructive Testing
https://schema.org/isbn	80-214-2749-3
http://localhost/t...ganizacniJednotka	26220

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