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A resonant testing method for high frequency testing of composites in the VHCF regime

Lorsch, Paul und Sinapius, Michael und Wierach, Peter (2016) A resonant testing method for high frequency testing of composites in the VHCF regime. Materials Science and Engineering (MSE) 2016, 27.-29. Sep. 2016, Darmstadt.

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Kurzfassung

Composite materials are being used in many structural applications nowadays. To achieve maximum reliability and safety, it is necessary to perform fatigue tests that cover load cases from short intense lives up to long lasting lives with low stresses. The latter case leads to a high number of load cycles up to the very-high-cycle-fatigue regime beyond 10^7 loading cycles. Conservative testing methods use testing frequencies below 10 Hz to avoid specimen heating or strain-rate related effects in the material. This results in long testing times, and together with the needed number of specimens, very long testing campaigns. The only option to shorten this testing time is to raise the testing frequency by a significant factor. However, positively driven test machines, like standard servo-hydraulic test rigs, have a limited testing frequency. To avoid this, the testing approach must be shifted from the positively driven concept towards a resonantly driven concept. The specimen then becomes a part of the load-generating system and the entire test rig uses its own mass inertia rather than suppressing them. Following this approach, a two-mass-oscillator is presented to show the working principle. This principle is then validated against an analytic model of the oscillator. The control circuit is presented, that tracks the resonant frequency of the oscillator and maintains a constant stress amplitude in the specimen. The working principle of this nested controller is presented along with the ability to measure data over the fatigue-life of the specimen. Finally results of the fatigue test are shown.

elib-URL des Eintrags:https://elib.dlr.de/107821/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:A resonant testing method for high frequency testing of composites in the VHCF regime
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Lorsch, PaulTU Braunschweig / DLR Braunschweighttps://orcid.org/0000-0001-8539-3816NICHT SPEZIFIZIERT
Sinapius, MichaelTU BraunschweigNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wierach, PeterPeter.Wierach (at) dlr.dehttps://orcid.org/0000-0003-0852-9112144717040
Datum:28 September 2016
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:VHCF, Composites, GFRP, resonant, testing
Veranstaltungstitel:Materials Science and Engineering (MSE) 2016
Veranstaltungsort:Darmstadt
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:27.-29. Sep. 2016
HGF - Forschungsbereich:Energie
HGF - Programm:Erneuerbare Energie
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SF - Solarforschung
DLR - Teilgebiet (Projekt, Vorhaben):E - Windenergie (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik > Multifunktionswerkstoffe
Hinterlegt von: Lorsch, Paul
Hinterlegt am:19 Dez 2016 07:42
Letzte Änderung:18 Okt 2023 12:39

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