Comparison of crack geometry determined with phase contrast radiography and with microtomography

S. R. Stock*, K. Ignatiev, W. K. Lee, K. Fezzaa, G. R. Davis, J. C. Elliott

*Corresponding author for this work

Research output: Contribution to journalConference article

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.

Original languageEnglish (US)
JournalMaterials Research Society Symposium - Proceedings
Volume678
StatePublished - Dec 1 2001
EventApplications of Synchrotron Radiation Techniques to Materials Science VI - San Francisco, CA, United States
Duration: Apr 16 2001Apr 20 2001

Fingerprint

crack geometry
Radiography
phase contrast
radiography
cracks
Cracks
Geometry
crack closure
thick plates
fracture mechanics
Crack closure
spatial distribution
synchrotrons
roughness
projection
Synchrotrons
Fracture mechanics
Spatial distribution
Surface roughness
sensitivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Stock, S. R., Ignatiev, K., Lee, W. K., Fezzaa, K., Davis, G. R., & Elliott, J. C. (2001). Comparison of crack geometry determined with phase contrast radiography and with microtomography. Materials Research Society Symposium - Proceedings, 678.
Stock, S. R. ; Ignatiev, K. ; Lee, W. K. ; Fezzaa, K. ; Davis, G. R. ; Elliott, J. C. / Comparison of crack geometry determined with phase contrast radiography and with microtomography. In: Materials Research Society Symposium - Proceedings. 2001 ; Vol. 678.
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Comparison of crack geometry determined with phase contrast radiography and with microtomography. / Stock, S. R.; Ignatiev, K.; Lee, W. K.; Fezzaa, K.; Davis, G. R.; Elliott, J. C.

In: Materials Research Society Symposium - Proceedings, Vol. 678, 01.12.2001.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Comparison of crack geometry determined with phase contrast radiography and with microtomography

AU - Stock, S. R.

AU - Ignatiev, K.

AU - Lee, W. K.

AU - Fezzaa, K.

AU - Davis, G. R.

AU - Elliott, J. C.

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AB - 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.

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