Detail publikace

Experimental Study of Micro-Cracks in Composites under Mechanical Stress

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

KOKTAVÝ, P., KOKTAVÝ, B.

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"
}