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Numerical aspects of micromechanical fatigue simulations of FRP - Limits of degradation and adaptive cycle jump approach

Lüders, Caroline (2019) Numerical aspects of micromechanical fatigue simulations of FRP - Limits of degradation and adaptive cycle jump approach. International Conference on Material Modelling ICMM 6, 2019-06-26 - 2019-06-28, Lund, Schweden.

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Kurzfassung

Finite element based micromechanical fatigue damage models are a promising approach for getting a deeper insight into the underlying physical principles of fatigue damage in fibre reinforced plastics (FRP). The fatigue damage behaviour of FRP is very progressive and accompanied by load redistributions. Capturing these effects requires a transient analysis in conjunction with the usage of progressive damage models. In addition to this, for economic needs, the FE simulation should be computationally efficient. To meet the different and partly contrasting demands on fatigue damage analyses, the most models make use of numerical tweaks. For example, considering the fully damaged state of a material point, the material parameters are tried to be reduced to zero, but – for numerical convergence and stability reasons – they are degraded to a small fraction of the initial properties, only. Additionally, besides the gradual material degradation depending on the number of applied load cycles, also sudden failure within a load cycle due to exceeding the strength limit of the material may takes place which, nevertheless, is not considered in each micromechanical fatigue damage model. Although a transient analysis tracking the cycles of the fatigue load is necessary, passing through every single cycle is computationally extremely expensive. A solution to this challenge is the cycle jump approach introducing another numerical parameter: The cycle jump determines the number of cycles over which the damage state is extrapolated. Regardless of the underlying damage model quality, the aforementioned parameters might have such a high influence that they might spoil the overall model quality and predictability. Thus the influence of the following numerical parameters on the obtained progressive damage behaviour of FRP is investigated for transverse tensile fatigue loads: 1) whether or not the model considers static failure within a simulated load cycle, 2) the degree of material property degradation after sudden failure and 3) the size of the cycle jump. The simulated damage behaviour is evaluated using experimentally observed crack patterns published in the literature. The results reveal a significant influence of the degree of material degradation and of the cycle jump on the simulated matrix crack formation at both, higher and lower fatigue loads. Static failure within a simulated load cycle primarily affects the damage behaviour at higher fatigue loads. The presentation gives recommendations of the parameter choice for plausible progressive fatigue damage simulation results. Regarding the cycle jump, an adaptive algorithm is proposed and implemented. This approach leads to plausible fatigue damage results paired with a significant reduction of computation time comparing to a cycle-by-cycle analysis.

elib-URL des Eintrags:https://elib.dlr.de/131199/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Numerical aspects of micromechanical fatigue simulations of FRP - Limits of degradation and adaptive cycle jump approach
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Lüders, Carolinecaroline.lueders (at) dlr.dehttps://orcid.org/0000-0002-9661-7819NICHT SPEZIFIZIERT
Datum:26 Juni 2019
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Fatigue, FRP, micromechanics, progressive damage degradation, cycle jump
Veranstaltungstitel:International Conference on Material Modelling ICMM 6
Veranstaltungsort:Lund, Schweden
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:26 Juni 2019
Veranstaltungsende:28 Juni 2019
Veranstalter :Universität Lund
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Schienenverkehr
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V SC Schienenverkehr
DLR - Teilgebiet (Projekt, Vorhaben):V - NGT BIT (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik > Strukturmechanik
Hinterlegt von: Lüders, Dr.-Ing. Caroline
Hinterlegt am:02 Dez 2019 08:56
Letzte Änderung:24 Apr 2024 20:34

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