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Fraunhofer-Institut für Zuverlässigkeit und Mikrointegration IZM
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PublicationNanodeformation Measurements for Reliability Studies of Nanosystems( 2007)
;Keller, J. ;Gollhardt, A. ;Vogel, D.Michel, B. -
PublicationMessung von Bruchkenngrößen in sehr kleinen Werkstoffbereichen mit dem AFM( 2007)
;Keller, J. ;Gollhardt, A. ;Vogel, D.Michel, B. -
PublicationExperimental Determination of Fracture Parameters Within Small Regions by AFM Techniques( 2007)
;Keller, J. ;Gollhardt, A. ;Vogel, D.Michel, B. -
PublicationMicro and nanomechanical Deformation Analysis at Materials Interfaces( 2005)
;Keller, J.Michel, B. -
PublicationfibDAC - A new Approach of Material Characterization for the Transition from Micro to Nano Scale( 2005)
;Vogel, D. ;Sabaté, N. ;Keller, J. ;Auersperg, J.Michel, B. -
PublicationCharacterization of nanoscale modified polymers for automotive applications( 2005)
;Vogel, D. ;Gollhardt, A. ;Keller, J. ;Holst, M. ;Muzic, M.Michel, B. -
PublicationCombination of nanoDAC and FEM for reliability analysis of materials in the micro-nano-transition scale( 2005)
;Kaulfersch, E. ;Keller, J.Michel, B. -
PublicationDetermination of local stress intensity factor at crack tip using image correlation techniques( 2004)
;Tsai, Y. ;Keller, J. ;Eylon, D. ;Vogel, D. ;Michel, B.Meyendorf, N.The extraordinary mechanical properties of high strength aluminum alloys such as AA7075-T6 are caused by coherent nanoprecipitations. These nanoprecipitations generate local stress fields and interact with moving dislocations and propagating microcracks. In this paper, image correlation techniques are used to determine the local strain and stress field in the vicinity of fatigue crack tips during the loading of compact tension (CT) specimen. The fatigue crack tip was sharpened with decreasing fatigue loading after fatigue cracks initial appearance. Images of the crack tip were taken using atomic force microscopy/ultrasonic force microscopy (AFM/UFM) and white light interference microscopy (WLIM) before and after mechanical loading of the specimen. Both techniques are applicable for measuring the out-of plane displacement during the loading process. In addition, image correlation techniques can be used to determine the in-plane displacement resulting from mechanical loading. This information is used to calculate the local stress intensity factor in the vicinity of the crack tips.