Lupascu, Doru C. ; Nuffer, Jürgen ; Rödel, Jürgen (1999)
Acoustic emission from different PZT.
In: Ferroelectrics, 222 (1)
doi: 10.1080/00150199908014823
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Acoustic emissions (AE) in ferroelectrics originate from three major sources: domain pattern changes, electric discharges and microcracking. All three may play a significant roll as damage mechanisms for the long term reliability of these materials in actuator applications. Contributions of at least two mechanisms in commercial PZT's are presented and the feasibility of a unique assignment of emission signature to mechanism is discussed. Soft PZT's show a distinct threshold for the first appearance of AE during poling. Large strain changes in these materials due to ldquoeasyrdquo domain wall motion do not yield AE while high strain levels generate cascaded events. Subsequent polarization reversals generate AE events at lower fields. Hard PZT's continuously generate AE during the whole hysteretic cycle with no observable field levels of ldquoeasyrdquo deformation, Domain wall motion is contrasted to the energy release of elastically prestressed domain states, domain nucleation, discharges and microcracking
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 1999 |
| Autor(en): | Lupascu, Doru C. ; Nuffer, Jürgen ; Rödel, Jürgen |
| Art des Eintrags: | Bibliographie |
| Titel: | Acoustic emission from different PZT |
| Sprache: | Englisch |
| Publikationsjahr: | 1999 |
| Verlag: | Taylor & Francis |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Ferroelectrics |
| Jahrgang/Volume einer Zeitschrift: | 222 |
| (Heft-)Nummer: | 1 |
| DOI: | 10.1080/00150199908014823 |
| Kurzbeschreibung (Abstract): | Acoustic emissions (AE) in ferroelectrics originate from three major sources: domain pattern changes, electric discharges and microcracking. All three may play a significant roll as damage mechanisms for the long term reliability of these materials in actuator applications. Contributions of at least two mechanisms in commercial PZT's are presented and the feasibility of a unique assignment of emission signature to mechanism is discussed. Soft PZT's show a distinct threshold for the first appearance of AE during poling. Large strain changes in these materials due to ldquoeasyrdquo domain wall motion do not yield AE while high strain levels generate cascaded events. Subsequent polarization reversals generate AE events at lower fields. Hard PZT's continuously generate AE during the whole hysteretic cycle with no observable field levels of ldquoeasyrdquo deformation, Domain wall motion is contrasted to the energy release of elastically prestressed domain states, domain nucleation, discharges and microcracking |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe 11 Fachbereich Material- und Geowissenschaften > Fachbereich Materialwissenschaft (1999 aufgegangen in 11 Fachbereich Material- und Geowissenschaften) |
| Hinterlegungsdatum: | 19 Nov 2008 16:24 |
| Letzte Änderung: | 12 Jul 2021 12:23 |
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