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Analysing Guided Wave Propagation with Ultrasonic Imaging Methods for the Optimisation of a Helicopter Tail Boom SHM System

Hillger, Wolfgang und Szewieczek, Artur und Schmidt, Daniel (2010) Analysing Guided Wave Propagation with Ultrasonic Imaging Methods for the Optimisation of a Helicopter Tail Boom SHM System. DEStech Publications, Inc. 5th EWSHM, 29 June - 02 July 2010, Sorrento, Iataly.

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Kurzfassung

GFRP and CFRP sandwich structures with honeycomb cores are high performance light weight structures for aerospace applications. Their impact sensitivity requires reliable NDT methods after fabrication and in service. Guided waves are able to propagate over large areas in components with a small attenuation and interact with defects. The DLR part of the EU-project AISHA II (Aircraft integrated structural health assessment) is focused on a full-scale test of a 3.5 m long tail-boom of the helicopter EC 135. Especially for the complex composite tail boom with an asymmetric construction these interactions are difficult to predict and to compute. However their knowledge is important for the development of a structural health monitoring system. At DLR the non-contact ultrasonic imaging techniques are successfully used for a complementary NDT method and for the visualisation of the guided wave propagation. Experimental investigations showed that damage detection in the upper and lower skin is only possible with frequencies below 30 kHz. For S-mode excitation a special actuator based on piezocomposite transducers has been developed. This transducer is a combination of piezoceramic materials with ductile polymers and flexible electrodes to form a reliable and damage tolerant actuator. At delaminations the S-mode with a wavelength of about 160 mm is converted to an A-mode. The paper describes the possibility of a defect selective SHM system and shows the capability of impact detection.

Dokumentart:Konferenzbeitrag (Paper)
Titel:Analysing Guided Wave Propagation with Ultrasonic Imaging Methods for the Optimisation of a Helicopter Tail Boom SHM System
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Hillger, WolfgangDLR-FA
Szewieczek, ArturDLR-FA
Schmidt, DanielDLR-FA
Datum:2010
Referierte Publikation:Ja
In ISI Web of Science:Nein
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Casciati, FabioNICHT SPEZIFIZIERT
Giordano, MicheleNICHT SPEZIFIZIERT
Verlag:DEStech Publications, Inc
Name der Reihe:Sorrento 10 SHM
Status:veröffentlicht
Stichwörter:GFRP and CFRP sandwich structures, Guided waves, AISHA II (Aircraft integrated structural health assessment), helicopter EC 135, defect selective SHM system
Veranstaltungstitel:5th EWSHM
Veranstaltungsort:Sorrento, Iataly
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:29 June - 02 July 2010
Veranstalter :National Research Council - Institute for Biometical and Composite Materials-IMCB-CNR, Italy
HGF - Forschungsbereich:keine Zuordnung
HGF - Programm:keine Zuordnung
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:keine Zuordnung
DLR - Forschungsgebiet:keine Zuordnung
DLR - Teilgebiet (Projekt, Vorhaben):anderes
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik > Multifunktionswerkstoffe
Hinterlegt von: Wolfgang Hillger
Hinterlegt am:24 Jan 2012 07:49
Letzte Änderung:24 Jan 2012 07:49

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