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Statements

Subject Item
n2:RIV%2F00216305%3A26220%2F14%3APU111425%21RIV15-MSM-26220___
rdf:type
n15:Vysledek skos:Concept
dcterms:description
Each material contains defects and in-homogeneities in a structure volume. It has influence on the properties of material (conductivity, mass density, mechanical properties). Interaction of the ultrasonic waves with defects or in-homogeneities in the solid state is not clear. Electro-ultrasonic spectroscopy can help to clarify this phenomenon. The electro-ultrasonic spectroscopy describes defects and un-homogeneities inside the sample structure. This method is quite different from electro-acoustic effect. Ultrasonic signal is in range from 20 kHz to 150 kHz. Ultrasonic signal changes geometry of the sample in elastic range only. The sizes of cracks are changing also in the sample volume. Conductivity near the area of cracks is strongly changing due to ultrasonic vibrations. It has influence on resistance of the sample which is changing along with a frequency of ultrasonic vibrations. The amplitude of the resistance change depends on the material, number of cracks, size of cracks and Eigen frequencies Each material contains defects and in-homogeneities in a structure volume. It has influence on the properties of material (conductivity, mass density, mechanical properties). Interaction of the ultrasonic waves with defects or in-homogeneities in the solid state is not clear. Electro-ultrasonic spectroscopy can help to clarify this phenomenon. The electro-ultrasonic spectroscopy describes defects and un-homogeneities inside the sample structure. This method is quite different from electro-acoustic effect. Ultrasonic signal is in range from 20 kHz to 150 kHz. Ultrasonic signal changes geometry of the sample in elastic range only. The sizes of cracks are changing also in the sample volume. Conductivity near the area of cracks is strongly changing due to ultrasonic vibrations. It has influence on resistance of the sample which is changing along with a frequency of ultrasonic vibrations. The amplitude of the resistance change depends on the material, number of cracks, size of cracks and Eigen frequencies
dcterms:title
Microstructure and Defects Evaluation of Varistors by Ultrasonic Waves in Low Frequency Range Microstructure and Defects Evaluation of Varistors by Ultrasonic Waves in Low Frequency Range
skos:prefLabel
Microstructure and Defects Evaluation of Varistors by Ultrasonic Waves in Low Frequency Range Microstructure and Defects Evaluation of Varistors by Ultrasonic Waves in Low Frequency Range
skos:notation
RIV/00216305:26220/14:PU111425!RIV15-MSM-26220___
n3:aktivita
n6:P
n3:aktivity
P(ED1.1.00/02.0068), P(ED2.1.00/03.0072)
n3:cisloPeriodika
1
n3:dodaniDat
n4:2015
n3:domaciTvurceVysledku
n7:5802407 n7:2967677 n7:9770690 Cséfalvay, Gabriel
n3:druhVysledku
n9:J
n3:duvernostUdaju
n14:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
29245
n3:idVysledku
RIV/00216305:26220/14:PU111425
n3:jazykVysledku
n17:eng
n3:klicovaSlova
Non-destructive testing, electro-ultrasonic spectroscopy, resistance change, crack geometry change, inhomogeneities
n3:klicoveSlovo
n11:electro-ultrasonic%20spectroscopy n11:crack%20geometry%20change n11:resistance%20change n11:inhomogeneities n11:Non-destructive%20testing
n3:kodStatuVydavatele
CH - Švýcarská konfederace
n3:kontrolniKodProRIV
[287E9A38C74E]
n3:nazevZdroje
Key Engineering Materials (print)
n3:obor
n5:BE
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
4
n3:projekt
n12:ED1.1.00%2F02.0068 n12:ED2.1.00%2F03.0072
n3:rokUplatneniVysledku
n4:2014
n3:svazekPeriodika
465
n3:tvurceVysledku
Cséfalvay, Gabriel Škarvada, Pavel Tofel, Pavel Šikula, Josef
s:issn
1013-9826
s:numberOfPages
4
n13:organizacniJednotka
26220