Aufsatz in einer Fachzeitschrift
Micro-notches for studying growth of small cracks
Details zur Publikation
Autor(inn)en: | Wessel, W.; Mildner, J.; Pitz, P.; Brückner-Foit, A.; Wollenhaupt, M.; Baumert, T. |
Publikationsjahr: | 2015 |
Zeitschrift: | Fatigue and Fracture of Engineering Materials and Structures |
Seitenbereich: | 673-680 |
Jahrgang/Band : | 38 |
Heftnummer: | 6 |
ISSN: | 8756-758X |
eISSN: | 1460-2695 |
DOI-Link der Erstveröffentlichung: |
URN / URL: |
Zusammenfassung, Abstract
Well-defined starter cracks at preselected sites in the microstructures are needed for systematic investigation of the characteristic features of microstructure controlled growth of small cracks. A kinked ellipsoidal micronotch with very high notch factor at the trailing kink is proposed, which triggers controlled crack initiation along the notch contour. These micronotches can be machined by femtosecond laser ablation with virtually no heat-affected zone at the edges. Crack growth results obtained for an intermetallic -TiAl alloy are presented as an illustrative example.
Well-defined starter cracks at preselected sites in the microstructures are needed for systematic investigation of the characteristic features of microstructure controlled growth of small cracks. A kinked ellipsoidal micronotch with very high notch factor at the trailing kink is proposed, which triggers controlled crack initiation along the notch contour. These micronotches can be machined by femtosecond laser ablation with virtually no heat-affected zone at the edges. Crack growth results obtained for an intermetallic -TiAl alloy are presented as an illustrative example.
