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Experimental and analytical investigation of the TMF-HCF lifetime behavior of two cast iron alloys

  • The combined loading Thermomechanical Fatigue (TMF) with High Cycle Fatigue (HCF) has been experimentally investigated for two cast iron alloys. Both alloys contain globular graphite nodules but the first one has a ferritic structure while the second one has an austenitic crystal structure. In particular, the influences of the HCF frequency, of the HCF loading amplitude and of the location of the superposed HCF cycles have been investigated. It was observed that the HCF frequency has a limited impact on the fatigue life. On the other side, the HCF-strain amplitude has a highly non-linear influence on the fatigue life. The experimental results can be understood in terms of a fracture mechanics based damage mechanism: Cracks quickly initiate due to the TMF loading and the growth of the cracks up to a few mm controls the fatigue life. If HCF-loading cycles are superposed, cyclic crack propagation dramatically accelerates after a threshold has been reached. This threshold is regarded asThe combined loading Thermomechanical Fatigue (TMF) with High Cycle Fatigue (HCF) has been experimentally investigated for two cast iron alloys. Both alloys contain globular graphite nodules but the first one has a ferritic structure while the second one has an austenitic crystal structure. In particular, the influences of the HCF frequency, of the HCF loading amplitude and of the location of the superposed HCF cycles have been investigated. It was observed that the HCF frequency has a limited impact on the fatigue life. On the other side, the HCF-strain amplitude has a highly non-linear influence on the fatigue life. The experimental results can be understood in terms of a fracture mechanics based damage mechanism: Cracks quickly initiate due to the TMF loading and the growth of the cracks up to a few mm controls the fatigue life. If HCF-loading cycles are superposed, cyclic crack propagation dramatically accelerates after a threshold has been reached. This threshold is regarded as controlling the fatigue life reduction. The previous ideas have been expressed in a model that can be very simply applied to estimate the fatigue life reduction ratio due to the superposed HCF cycles. It only contains two adjustable parameters and can be combined with any TMF life assessment model.zeige mehrzeige weniger

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Metadaten
Autor*innen:Bernard FedelichORCiD, Hans-Joachim Kühn, Birgit Rehmer, Birgit SkrotzkiORCiD
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):International journal of fatigue
Jahr der Erstveröffentlichung:2017
Verlag:Elsevier
Verlagsort:Oxford
Jahrgang/Band:99
Ausgabe/Heft:2 (Special issue: Recent developments in thermo-mechanical fatigue)
Erste Seite:266
Letzte Seite:278
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Cast iron; Fatigue assessment; High Cycle Fatigue (HCF); Thermomechanical Fatigue (TMF)
Veranstaltung:3rd International Workshop on Thermo-Mechanical Fatigue (TMF-Workshop 2016)
Veranstaltungsort:Berlin, Germany
Beginndatum der Veranstaltung:27.04.2016
Enddatum der Veranstaltung:29.04.2016
DOI:10.1016/j.ijfatigue.2016.11.013
ISSN:0142-1123
ISSN:1879-3452
Zugehöriger Identifikator:https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/40867
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:12.04.2017
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:29.05.2017
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