Experimental Study of Micro-cracks in Composites under Mechanical Stress

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F04%3APU44719" target="_blank" >RIV/00216305:26220/04:PU44719 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

čeština

Original language name

Experimentální studium mikrotrhlin v kompozitních materiálech při mechanickém zatěžování

Original language 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 aand 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 outin 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.

Czech name

Experimentální studium mikrotrhlin v kompozitních materiálech při mechanickém zatěžování

Czech 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 aand 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 outin 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.

Type

D - Article in proceedings

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

<a href="/en/project/GP102%2F02%2FD073" target="_blank" >GP102/02/D073: Cracks detection in solids by means of electromagnetic emission</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2004

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

EXPERIMENT '04

ISBN

80-7204-354-4

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

209-214

Publisher name

Fakulta stavební VUT v Brně

Place of publication

Brno

Event location

Brno

Event date

Oct 14, 2004

Type of event by nationality

EUR - Evropská akce

UT code for WoS article

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