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Resonant approach for testing glass-fiber-reinforced composites in the VHCF-regime

Lorsch, Paul and Sinapius, Michael and Wierach, Peter (2014) Resonant approach for testing glass-fiber-reinforced composites in the VHCF-regime. MSE 2014, 23.-25. Sep. 2014, Darmstadt, Deutschland.

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Abstract

Numerous applications of composite materials face fatigue lives beyond 10^8 cycles. On the other hand, only few researches have been done to identify the active fatigue mechanisms and the development of fatigue damages. As conservative testing is done at rather low testing frequencies, a concept for high-frequency testing has to be found. This leads to reasonably short testing times for studies in the very-high-cycle-fatigue regime of fiber-reinforced-composites. In this paper a resonant test setup is presented, that contains a two-mass-oscillator. The specimen is a component of the oscillator and one single eigenmode is used to load the specimen at a load ratio of -1. To ensure a single-axle load case, tubular specimens are used, as they suppress subordinated eigenmodes of the oscillator. Furthermore, tubular specimens have no free edges, so no defects originate from free edges. Thus only damage mechanisms are observable that occur inside the laminate. For initial tests tubular specimens with a ±45° layup are made by filament winding as this layup induces a high interlaminar shear stress. Finally, first results are presented and a control circuit is proposed to maintain a constant load at the natural frequency of the resonant system.

Item URL in elib:https://elib.dlr.de/107829/
Document Type:Conference or Workshop Item (Speech)
Title:Resonant approach for testing glass-fiber-reinforced composites in the VHCF-regime
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lorsch, PaulTU Braunschweig / DLR Braunschweighttps://orcid.org/0000-0001-8539-3816
Sinapius, MichaelTU BraunschweigUNSPECIFIED
Wierach, PeterUNSPECIFIEDUNSPECIFIED
Date:23 September 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:VHCF, Composites, GFRP, resonant, testing
Event Title:MSE 2014
Event Location:Darmstadt, Deutschland
Event Type:international Conference
Event Dates:23.-25. Sep. 2014
Organizer:DGM - Deutsche Gesellschaft für Materialkunde
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:other
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Wind Energy (old), L - Structures and Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Lorsch, Paul
Deposited On:12 Dec 2016 08:46
Last Modified:12 Dec 2016 08:46

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