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Numerical simulation of plasticity induced fatigue crack opening and closure for autofrettaged inter-secting holes

Herz, Elisabeth ; Hertel, Olaf ; Vormwald, Michael (2011)
Numerical simulation of plasticity induced fatigue crack opening and closure for autofrettaged inter-secting holes.
In: Engineering Fracture Mechanics, 78 (3)
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

The autofrettage of intersecting holes leads to extremely high compressive residual stress fields. These stresses in combination with the plastic deformations decelerate fatigue cracks initiated at the hole intersection notch. Simulations of plasticity induced crack closure of such cracks are presented based on the strip yield and a finite element model. The strip yield model has been extended to allow for an input of residual stresses coming from elsewhere, e.g. from a finite element calculation or measurements. The calculations are applied for constant as well as variable amplitude loading. The numerical expense of the finite element based modelling for variable amplitude loading is still too high if millions of cycles have to be considered. Therefore, a new approximation method is proposed introducing compensatory load sequences. Simulation results are compared to experimentally determined results showing good agreement. However, the accuracy of crack initiation life estimates has turned out to provide a high potential for further improvement.

Typ des Eintrags: Artikel
Erschienen: 2011
Autor(en): Herz, Elisabeth ; Hertel, Olaf ; Vormwald, Michael
Art des Eintrags: Bibliographie
Titel: Numerical simulation of plasticity induced fatigue crack opening and closure for autofrettaged inter-secting holes
Sprache: Englisch
Publikationsjahr: Februar 2011
Verlag: Elsevier
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Engineering Fracture Mechanics
Jahrgang/Volume einer Zeitschrift: 78
(Heft-)Nummer: 3
Kurzbeschreibung (Abstract):

The autofrettage of intersecting holes leads to extremely high compressive residual stress fields. These stresses in combination with the plastic deformations decelerate fatigue cracks initiated at the hole intersection notch. Simulations of plasticity induced crack closure of such cracks are presented based on the strip yield and a finite element model. The strip yield model has been extended to allow for an input of residual stresses coming from elsewhere, e.g. from a finite element calculation or measurements. The calculations are applied for constant as well as variable amplitude loading. The numerical expense of the finite element based modelling for variable amplitude loading is still too high if millions of cycles have to be considered. Therefore, a new approximation method is proposed introducing compensatory load sequences. Simulation results are compared to experimentally determined results showing good agreement. However, the accuracy of crack initiation life estimates has turned out to provide a high potential for further improvement.

Freie Schlagworte: Crack closure Fatigue crack growth Autofrettage Plasticity Common rail
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: 27 Jan 2015 15:01
Letzte Änderung: 19 Mär 2015 08:53
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