Journal article
Micro-notches for studying growth of small cracks



Publication Details
Authors:
Wessel, W.; Mildner, J.; Pitz, P.; Brückner-Foit, A.; Wollenhaupt, M.; Baumert, T.
Publication year:
2015
Journal:
Fatigue and Fracture of Engineering Materials and Structures
Pages range:
673-680
Volume number:
38
ISSN:
8756-758X

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.


Keywords
crack initiation and propagation, fatigue crack growth, intermetallic compound, microcrack, notched specimen

Last updated on 2019-28-11 at 10:37