|About this Abstract
||Materials Science & Technology 2011
||Fatigue and Microstructure: A Symposium on Recent Advances
||Determining Local Crack Growth Rates for Small Cracks in Inhomogeneous Materials
||Angelika Brueckner-Foit, Frank Zeismann, Pascal Pitz
|On-Site Speaker (Planned)
Many technical components contain zones of distinctively different material properties which have either been introduced on purpose in order to introduce the performance of the component or are unavoidable in the course of the manufacturing routine. The fatigue properties of such a component depend on the fatigue behaviour of each phase, but also on those of the transition zone. In general, this transition zone is too small and cannot be tested directly. However, small cracks growing into this zone can be initialized using micro-notches manufactured by femtosecond laser machining. The local crack growth rates can be determined using continuous surface observation with a travelling long distance microscope. This method is applied to a flange shaft which has been made by a combined thermal and mechanical forming routine leading to local martensitic transformations of the original ferritic pearlitic microstructure.
||Definite: A CD-only volume