Stress update algorithm for the combined viscoplastic and plastic behaviours of single-crystal superalloys
- A crystallographic constitutive model is developed, which accounts for both rate-sensitive and rate-insensitive flow. Single-crystal plasticity and viscoplasticity are the limiting cases of the model, so that it properly reflects the material response over a wide temperature range. A non-linear dynamic recovery is included to properly describe ratchetting. We provide a robust integration scheme based on generalization of the return-mapping algorithm and of the procedure for active set search. The implicit integration and consistent tangent are implemented through the UMAT subroutine in the ABAQUS finite element program. The capability of the model to account for both high and low strain rates is demonstrated in numerical examples. Finally, the stability of integration scheme and quadratic convergence of the global NewtonRaphson equilibrium iterations are demonstrated on the example of a notched bar under tension.
Autor*innen: | Vitaliy Kindrachuk, Bernard FedelichORCiD |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | International journal for numerical methods in engineering |
Jahr der Erstveröffentlichung: | 2011 |
Verlag: | Wiley |
Verlagsort: | Chichester |
Jahrgang/Band: | 88 |
Ausgabe/Heft: | 1 |
Erste Seite: | 83 |
Letzte Seite: | 102 |
Freie Schlagwörter: | Crystal plasticity; Implicit integration; Superalloy; Viscoplasticity |
DOI: | 10.1002/nme.3172 |
ISSN: | 0029-5981 |
ISSN: | 1097-0207 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 19.02.2016 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 21.07.2011 |