Publication detail

Experimental Study of Electromagnetic Emission in Composites under Mechanical Stress

KOKTAVÝ, B., KOKTAVÝ, P., TOMEČEK, K., ŠTEFKOVÁ, M.

Original Title

Experimental Study of Electromagnetic Emission in Composites under Mechanical Stress

Type

conference paper

Language

English

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

Electromagnetic Emission, Electric Charge, Micro-Cracks

Authors

KOKTAVÝ, B., KOKTAVÝ, P., TOMEČEK, K., ŠTEFKOVÁ, M.

RIV year

2004

Released

1. 1. 2004

Publisher

Akademické nakladatelství CERM, s.r.o. Brno

Location

Olomučany

ISBN

80-7204-353-6

Book

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

Pages from

61

Pages to

65

Pages count

5

BibTex

@inproceedings{BUT12116,
  author="Bohumil {Koktavý} and Pavel {Koktavý} and Karel {Tomeček} and Markéta {Štefková}",
  title="Experimental Study of Electromagnetic Emission in Composites under Mechanical Stress",
  booktitle="Research Activities of Physics Departments of Civil Engineering Faculties in the Czech and Slovak Republics",
  year="2004",
  pages="5",
  publisher="Akademické nakladatelství CERM, s.r.o. Brno",
  address="Olomučany",
  isbn="80-7204-353-6"
}