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Comparison of Crack Geometry Determined with Phase Contrast Radiography and with Microtomography

Published online by Cambridge University Press:  21 March 2011

S.R. Stock ,
K. Ignatiev ,
W.K. Lee ,
K. Fezzaa ,
G.R. Davis  and
J.C. Elliott
S.R. Stock
Affiliation:
School of Materials Sci & Eng, Georgia Inst of Technology, Atlanta, GA 30332-0245, USA
K. Ignatiev
Affiliation:
School of Materials Sci & Eng, Georgia Inst of Technology, Atlanta, GA 30332-0245, USA
W.K. Lee
Affiliation:
Advanced Photon Source, User Program Div, Argonne National Lab, IL, USA
K. Fezzaa
Affiliation:
Advanced Photon Source, User Program Div, Argonne National Lab, IL, USA
G.R. Davis
Affiliation:
Dental Biophysics, Queen Mary, University of London, London, UK
J.C. Elliott
Affiliation:
Dental Biophysics, Queen Mary, University of London, London, UK
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Abstract

X-ray microtomography of the three-dimensional spatial distribution of crack opening as a function of applied load has helped clarify important processes of roughness-induced fatigue crack closure. Fracture mechanics dictates sample geometries which limit the crack opening sensitivity that can be obtained with microtomography, and there is a real need to be able to quantify smaller openings. Synchrotron phase contrast radiographs of an AA 2090 T8E41 (central 2 mm of a 12.7 mm thick plate) compact tension sample show the fatigue crack geometry clearly while absorption contrast radiographs of the same sample have difficulty even detecting the crack. The phase contrast expected in the projection images is determined from the microtomography-derived, three-dimensional crack geometry and compared to that observed experimentally. Good agreement is obtained between the phase contrast radiographs and the expected pattern of contrast.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 678: Symposia EE – Applications of Synchrotron Radiation Techniques…IV , 2001 , EE3.6.1
Copyright
Copyright © Materials Research Society 2001

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