Hillenbrand, J. ; Sessler, Gerhard M. ; Zhang, X. (2005)
Verification of a model for the d33-coefficient of ferroelectrets.
12th International Symposium on Electrets (ISE 12). Salvador, Brazil (11.09.2005-14.09.2005)
doi: 10.1109/ISE.2005.1612341
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
An existing model for the piezoelectric d/sub 33/-coefficients of charged cellular polymers (ferroelectrets) is tested with experimental data obtained from two different cellular polypropylene (PP) materials. The model assumes the cellular film to consist of plane parallel layers of solid and gaseous material with the surfaces of the solid layers charged in a specific way. Films of charged cellular PP are expanded by a pressure treatment. Subsequently, due to viscoelastic relaxation, the thickness of the films decreases, thus causing a change of their Young's modulus Y. Values of Y are obtained from interferometric measurements of the thickness resonance frequency. Together with the measured thickness of the solid layers and air layers in the material, the d/sub 33/-coefficients can be determined from the model. These values are compared with experimental results for d/sub 33/ also obtained inter-ferometrically by means of the inverse piezoelectric effect. Very good agreement between the calculated and measured d/sub 33/-coefficients and their change with film thickness and time is obtained.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2005 |
| Autor(en): | Hillenbrand, J. ; Sessler, Gerhard M. ; Zhang, X. |
| Art des Eintrags: | Bibliographie |
| Titel: | Verification of a model for the d33-coefficient of ferroelectrets |
| Sprache: | Englisch |
| Publikationsjahr: | 2005 |
| Ort: | Piscataway, NJ |
| Verlag: | IEEE Operations Center |
| Buchtitel: | ISE12. 12th International Symposium on Electrets : proceedings |
| Veranstaltungstitel: | 12th International Symposium on Electrets (ISE 12) |
| Veranstaltungsort: | Salvador, Brazil |
| Veranstaltungsdatum: | 11.09.2005-14.09.2005 |
| DOI: | 10.1109/ISE.2005.1612341 |
| Kurzbeschreibung (Abstract): | An existing model for the piezoelectric d/sub 33/-coefficients of charged cellular polymers (ferroelectrets) is tested with experimental data obtained from two different cellular polypropylene (PP) materials. The model assumes the cellular film to consist of plane parallel layers of solid and gaseous material with the surfaces of the solid layers charged in a specific way. Films of charged cellular PP are expanded by a pressure treatment. Subsequently, due to viscoelastic relaxation, the thickness of the films decreases, thus causing a change of their Young's modulus Y. Values of Y are obtained from interferometric measurements of the thickness resonance frequency. Together with the measured thickness of the solid layers and air layers in the material, the d/sub 33/-coefficients can be determined from the model. These values are compared with experimental results for d/sub 33/ also obtained inter-ferometrically by means of the inverse piezoelectric effect. Very good agreement between the calculated and measured d/sub 33/-coefficients and their change with film thickness and time is obtained. |
| Fachbereich(e)/-gebiet(e): | 18 Fachbereich Elektrotechnik und Informationstechnik |
| Hinterlegungsdatum: | 20 Nov 2008 08:26 |
| Letzte Änderung: | 22 Nov 2024 07:59 |
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