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Detail publikace
KOKTAVÝ, P., KOKTAVÝ, B.
Originální název
Experimental Study of Micro-Cracks in Composites under Mechanical Stress
Typ
článek ve sborníku ve WoS nebo Scopus
Jazyk
angličtina
Originální abstrakt
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.
Klíčová slova
Electromagnetic Emission, Composite, Micro-Crack, Electric Charge
Autoři
Rok RIV
2004
Vydáno
1. 1. 2004
Nakladatel
Czech Society for Nondestructive Testing
Místo
Praha
ISBN
80-214-2749-3
Kniha
DEFEKTOSKOPIE 2004
Strany od
81
Strany do
88
Strany počet
8
BibTex
@inproceedings{BUT12113, author="Pavel {Koktavý} and Bohumil {Koktavý}", title="Experimental Study of Micro-Cracks in Composites under Mechanical Stress", booktitle="DEFEKTOSKOPIE 2004", year="2004", pages="8", publisher="Czech Society for Nondestructive Testing", address="Praha", isbn="80-214-2749-3" }