Experimental Study of Electromagnetic Emission in Composites under Mechanical Stress

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F04%3APU44717" target="_blank" >RIV/00216305:26220/04:PU44717 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Experimental Study of Electromagnetic Emission in Composites under Mechanical Stress

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 elektromagnetické emise v kompozitech při mechanickém namáhání

Czech description

Mechanické namáhání vzorků vede ke vzniku mikrotrhlin, na jejichž stěnách se objevuje elektrický náboj. Stěny trhlin vykonávají tlumené mechanické kmity. Pohyb náboje indukuje elektrické napětí na elektrodách umístěných na povrchu vzorku. Měření bylo prováděno na stavebním materiálu extren.

Type

D - Article in proceedings

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

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

Research Activities of Physics Departments of Civil Engineering Faculties in the Czech and Slovak Republics

ISBN

80-7204-353-6

ISSN

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e-ISSN

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Number of pages

5

Pages from-to

61-65

Publisher name

Akademické nakladatelství CERM, s.r.o. Brno

Place of publication

Olomučany

Event location

Cigháj

Event date

Sep 14, 2004

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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