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Ultrasonic inspection and data analysis of glass- and carbon-fibre-reinforced plastics
- Non-destructive testing (NDT) helps to find material defects without having an influence on the material itself. It is applied as a method of quality control, for online structural health monitoring, and for inspection of safety related components. Due to the ability of automation and a simple test setup ultrasonic testing is one major NDT technique next to several existing options. Whereas contact technique allows the use of higher frequencies of some MHz and phased array focusing, air-coupled ultrasonic testing (ACUT) shows different advantages. Most significant for ACUT is the absence of any coupling fluid and an economical test procedure respective time and costs. Both contact technique and ACUT have been improved and enhanced during the past years. One important enhancement is the development of airborne transducers based on ferroelectrets, like charged cellular polypropylene (cpp), which makes the application of any matching layers being mandatory in conventional piezoelectricNon-destructive testing (NDT) helps to find material defects without having an influence on the material itself. It is applied as a method of quality control, for online structural health monitoring, and for inspection of safety related components. Due to the ability of automation and a simple test setup ultrasonic testing is one major NDT technique next to several existing options. Whereas contact technique allows the use of higher frequencies of some MHz and phased array focusing, air-coupled ultrasonic testing (ACUT) shows different advantages. Most significant for ACUT is the absence of any coupling fluid and an economical test procedure respective time and costs. Both contact technique and ACUT have been improved and enhanced during the past years. One important enhancement is the development of airborne transducers based on ferroelectrets, like charged cellular polypropylene (cpp), which makes the application of any matching layers being mandatory in conventional piezoelectric transducers unnecessary. In this contribution we show ultrasonic inspection results of specimens made of carbon- and glass-fibre-reinforced plastic. These specimens include defects represented by drill holes and artificial delaminations of various size and depth. We compare inspection results achieved by using contact technique to those achieved by ACUT. For ACUT, conventional piezoelectric transducers and transducers based on cpp were used, both focused as well as non-focused types. Contact inspections were performed with a multi-channel matrix array probe. Once the inspection data is recorded it can be analysed in order to detect and evaluate defects in the specimen. We present different analysing strategies and compare these regarding detection rate and sizing of defects.…
Autor*innen: | Florian Schadow, Daniel Brackrock, Mate Gaal, Thomas Heckel |
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Dokumenttyp: | Beitrag zu einem Tagungsband |
Veröffentlichungsform: | Graue Literatur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | 3rd International Symposium on fatigue design and material defects (FDMD 2017) |
Jahr der Erstveröffentlichung: | 2017 |
Veröffentlichende Institution: | Bundesanstalt für Materialforschung und -prüfung (BAM) |
Verlag: | Elsevier B.V. |
Jahrgang/Band: | 7 |
Erste Seite: | 299 |
Letzte Seite: | 306 |
Freie Schlagwörter: | Air-coupled; Carbon-fibre-reinforced plastic; Defect sizing; Glass-fibre-reinforced; Material inspection; Ultrasonic testing |
Veranstaltung: | 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017 |
Veranstaltungsort: | Lecco, Italy |
Beginndatum der Veranstaltung: | 19.09.2017 |
Enddatum der Veranstaltung: | 22.09.2017 |
DOI: | 10.1016/j.prostr.2017.11.092 |
URN: | urn:nbn:de:kobv:b43-434802 |
ISSN: | 2452-3216 |
Verfügbarkeit des Dokuments: | Datei für die Öffentlichkeit verfügbar ("Open Access") |
Lizenz (Deutsch): | Creative Commons - Namensnennung-Nicht kommerziell-Keine Bearbeitung |
Datum der Freischaltung: | 19.12.2017 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 04.01.2019 |
Schriftenreihen ohne Nummerierung: | Wissenschaftliche Artikel der BAM |