Přístupnostní navigace
E-application
Search Search Close
Publication detail
KOKTAVÝ, B., KOKTAVÝ, P., TOMEČEK, K.
Original Title
Experimentální studium mikrotrhlin v kompozitních materiálech při mechanickém zatěžování
English Title
Experimental Study of Micro-cracks in Composites under Mechanical Stress
Type
conference paper
Language
Czech
Original Abstract
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.
Keywords
Kompozitní materiál, Mikrotrhliny, Elektrický náboj
Key words in English
Composites, Micro-cracks, Electric Charge
Authors
RIV year
2004
Released
1. 1. 2004
Publisher
Fakulta stavební VUT v Brně
Location
Brno
ISBN
80-7204-354-4
Book
EXPERIMENT '04
Pages from
209
Pages to
214
Pages count
6
BibTex
@inproceedings{BUT12226, author="Bohumil {Koktavý} and Pavel {Koktavý} and Karel {Tomeček}", title="Experimentální studium mikrotrhlin v kompozitních materiálech při mechanickém zatěžování", booktitle="EXPERIMENT '04", year="2004", pages="6", publisher="Fakulta stavební VUT v Brně", address="Brno", isbn="80-7204-354-4" }