Hertel, Olaf ; Vormwald, Michael (2007)
Stress gradient influence on fatigue crack growth under multiaxial non-proportional loading.
Sheffield
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
Commonly, basic experimental fatigue data are derived from unnotched smooth specimens. When this data is transferred to notched components, size effects have to be considered. In the present paper a fatigue life prediction approach for multiaxial non-proportional loading accounting for the geometrical size effect is presented. The approach is based on a short crack model for multiaxial non-proportional loading. The short crack model is extended by geometry correction functions for semi-elliptical surface cracks in inhomogeneous gradient stress fields. The comparison of calculated and experimentally observed fatigue lives of shouldered shafts made of S460N with notch radii of 0.2 to 4.0 mm under non-proportional tension and torsion loading yields a satisfying accuracy. The geometrical size effect is becoming significant for notch radii smaller than four times the defined technical crack size. Additionally, it is superposed by the statistical size effect. That is also taken into consideration by variation of the initial defect/crack size.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2007 |
| Autor(en): | Hertel, Olaf ; Vormwald, Michael |
| Art des Eintrags: | Bibliographie |
| Titel: | Stress gradient influence on fatigue crack growth under multiaxial non-proportional loading |
| Sprache: | Englisch |
| Publikationsjahr: | 2007 |
| Buchtitel: | 8th International Conference on Multiaxial Fatigue and Fracture |
| Veranstaltungsort: | Sheffield |
| Kurzbeschreibung (Abstract): | Commonly, basic experimental fatigue data are derived from unnotched smooth specimens. When this data is transferred to notched components, size effects have to be considered. In the present paper a fatigue life prediction approach for multiaxial non-proportional loading accounting for the geometrical size effect is presented. The approach is based on a short crack model for multiaxial non-proportional loading. The short crack model is extended by geometry correction functions for semi-elliptical surface cracks in inhomogeneous gradient stress fields. The comparison of calculated and experimentally observed fatigue lives of shouldered shafts made of S460N with notch radii of 0.2 to 4.0 mm under non-proportional tension and torsion loading yields a satisfying accuracy. The geometrical size effect is becoming significant for notch radii smaller than four times the defined technical crack size. Additionally, it is superposed by the statistical size effect. That is also taken into consideration by variation of the initial defect/crack size. |
| 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: | 02 Feb 2015 12:21 |
| Letzte Änderung: | 02 Feb 2015 12:21 |
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