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Assessment of microstructural influences on fatigue crack growth by the strip-yield model

Schlitzer, Teresa ; Rudolph, Jürgen ; Vormwald, Michael (2014)
Assessment of microstructural influences on fatigue crack growth by the strip-yield model.
In: Computational Materials Science, 94
doi: 10.1016/j.commatsci.2014.06.042
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

The strip-yield model is a common tool to calculate the cyclic crack tip opening displacement and the fatigue crack growth life of structures in case of isothermal fatigue loading. The incorporation of a temperature-dependent yield stress already enables its application in thermal fatigue analyses. A further extension of the strip-yield model is presented here together with simulation results: The rheological Masing model consisting of spring-slider elements connected in parallel is used to describe the material’s stress–strain curve. It results in different yield stresses belonging to the numerous sliding frictional elements. These different yield stresses are randomly arranged along the crack ligament line instead of the usually applied constant yield stress. They depend on temperature as the procedure should still be used at non-isothermal loading. Besides an improved modelling of the mechanical material behavior the consideration of microstructural aspects of fatigue crack growth becomes possible by influencing the values of the yield stresses near the crack initiation site.

Typ des Eintrags: Artikel
Erschienen: 2014
Autor(en): Schlitzer, Teresa ; Rudolph, Jürgen ; Vormwald, Michael
Art des Eintrags: Bibliographie
Titel: Assessment of microstructural influences on fatigue crack growth by the strip-yield model
Sprache: Englisch
Publikationsjahr: 2014
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Computational Materials Science
Jahrgang/Volume einer Zeitschrift: 94
DOI: 10.1016/j.commatsci.2014.06.042
URL / URN: http://www.sciencedirect.com/science/article/pii/S0927025614...
Kurzbeschreibung (Abstract):

The strip-yield model is a common tool to calculate the cyclic crack tip opening displacement and the fatigue crack growth life of structures in case of isothermal fatigue loading. The incorporation of a temperature-dependent yield stress already enables its application in thermal fatigue analyses. A further extension of the strip-yield model is presented here together with simulation results: The rheological Masing model consisting of spring-slider elements connected in parallel is used to describe the material’s stress–strain curve. It results in different yield stresses belonging to the numerous sliding frictional elements. These different yield stresses are randomly arranged along the crack ligament line instead of the usually applied constant yield stress. They depend on temperature as the procedure should still be used at non-isothermal loading. Besides an improved modelling of the mechanical material behavior the consideration of microstructural aspects of fatigue crack growth becomes possible by influencing the values of the yield stresses near the crack initiation site.

Fachbereich(e)/-gebiet(e): 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut für Stahlbau und Werkstoffmechanik > Fachgebiet Werkstoffmechanik
13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut für Stahlbau und Werkstoffmechanik
13 Fachbereich Bau- und Umweltingenieurwissenschaften
Hinterlegungsdatum: 19 Dez 2014 16:16
Letzte Änderung: 05 Feb 2015 17:22
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