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Investigating the VHCF of composite materials using new testing methods and a new fatigue damage model

Lorsch, Paul and Adam, Till Julian and Zeisberg, Marcel and Sinapius, Michael and Horst, Peter and Rolfes, Raimund and Wierach, Peter and Krüger, Heiko (2014) Investigating the VHCF of composite materials using new testing methods and a new fatigue damage model. In: 6th International Conference on VHCF. 6th International Conference on VHCF, 15.-18. Okt. 2014, Chengdu, China.

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Abstract

Composite materials are used in several fatigue-relevant applications nowadays and characteristic fatigue data is needed. However, composites have to be told apart from metals and so have to be the fatigue behaviors. Unfortunately, the established testing and simulation methods are not suitable for composites. However, two new experimental approaches providing accelerated VHCF testing are presented. A resonant and a non-resonant setup are used. For the first setup the resonant behavior of specimen and test stand are used to load GFRP tubes at roughly 600Hz and a load ratio of R=-1. The second approach utilizes a specifically designed four-point bending test running at 50-80 Hz. Fatigue data including stiffness degradation, evaluation of crack density and delamination are gained up to 10 8 cycles. Both methods reach testing frequencies beyond classic testing methods and thus allow time efficient VHCF testing. First results for fatigue testing with glass-fiber-reinforced plastics are presented. Furthermore, a new layer-based fatigue damage model (FDM) is presented, which is physically motivated by using an approach that relates energy dissipated under quasi-static and the energy dissipated under cyclic loading. The Puck failure criterion is used and has been extended with degradation factors for analyzing discontinuous damage. Load interactions as well as nonlinear damage accumulation are taken into account. Degradation of stiffness and strength can be calculated for every single layer over the simulated lifetime.

Item URL in elib:https://elib.dlr.de/107828/
Document Type:Conference or Workshop Item (Speech)
Title:Investigating the VHCF of composite materials using new testing methods and a new fatigue damage model
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lorsch, PaulTU Braunschweig / DLR Braunschweighttps://orcid.org/0000-0001-8539-3816
Adam, Till JulianTU BraunschweigUNSPECIFIED
Zeisberg, MarcelUniversität HannoverUNSPECIFIED
Sinapius, MichaelTU BraunschweigUNSPECIFIED
Horst, PeterTU BraunschweigUNSPECIFIED
Rolfes, RaimundUniversität HannoverUNSPECIFIED
Wierach, PeterDLR BraunschweigUNSPECIFIED
Krüger, HeikoUniversität HannoverUNSPECIFIED
Date:15 October 2014
Journal or Publication Title:6th International Conference on VHCF
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmailEditor's ORCID iD
Wang, QingyuanSichuan UniversityUNSPECIFIED
Hong, YoushiChinese Academy of ScienceUNSPECIFIED
Status:Published
Keywords:VHCF, Composites, GFRP, resonant, testing
Event Title:6th International Conference on VHCF
Event Location:Chengdu, China
Event Type:international Conference
Event Dates:15.-18. Okt. 2014
Organizer:Sichuan University
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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