Numerical calculation of ΔCTOD for thermomechanical fatigue crack growth
- The cyclic crack tip opening displacement ΔCTOD is a promising loading Parameter to quantify the crack propagation under thermomechanical fatigue (TMF). In this work, suitable techniques are investigated and compared for an accurate calculation of ΔCTOD under TMF loading using a viscoplastic temperature dependent material model. It turned out that collapsed special crack tip elements give the best results. An efficient FEM-technique is developed to simulate the incremental crack growth by successive remeshing, whereby the deformations and internal state variables are mapped from the old mesh onto the new one. The developed techniques are demonstrated and discussed for two-dimensional examples like TMF-specimens. Recommendations are made regarding important numerical control parameters like optimal size of crack tip elements, length of crack growth increment in relation to plastic zone size and ΔCTOD value.
Autor*innen: | Stephan Gesell |
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Koautor*innen: | Rahul Ganesh, Meinhard Kuna, Bernard FedelichORCiD, Björn Kiefer |
Dokumenttyp: | Vortrag |
Veröffentlichungsform: | Präsentation |
Sprache: | Englisch |
Jahr der Erstveröffentlichung: | 2021 |
Organisationseinheit der BAM: | 5 Werkstofftechnik |
5 Werkstofftechnik / 5.2 Metallische Hochtemperaturwerkstoffe | |
5 Werkstofftechnik / 5.5 Materialmodellierung | |
Freie Schlagwörter: | Crack growth; Crack tip opening displacement; Thermomechanical fatigue |
Themenfelder/Aktivitätsfelder der BAM: | Material |
Material / Degradation von Werkstoffen | |
Veranstaltung: | ESIS Technical Meeting on Numerical Methods (TC8) |
Veranstaltungsort: | Online meeting |
Beginndatum der Veranstaltung: | 06.04.2021 |
Enddatum der Veranstaltung: | 06.04.2021 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 12.04.2021 |
Referierte Publikation: | Nein |
Eingeladener Vortrag: | Nein |