Experimental Study of Micro-Cracks in Composites under Mechanical Stress

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F04%3APU44714" target="_blank" >RIV/00216305:26220/04:PU44714 - isvavai.cz</a>
Result on the web
—
DOI - Digital Object Identifier
—

Result language
angličtina
Original language name
Experimental Study of Micro-Cracks 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 mikrotrhlin v kompozitních materiálech při mechanickém zatěžování
Czech description
Mechanické zatěžování vzorků způsobuje vznik mikrotrhlin, jejichž stěnách dochází ke generování elektrického náboje.

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

Similar results(10)