Abstract
Plate-like samples are particularly challenging to reconstruct with computed tomography (CT) while preserving sensitivity to very small features within the sample. Specifically, quantifying fatigue crack openings of ≤ 2.5 μm in compact tension samples with maximum cross-sections of 25 mm is impractical with conventional microCT. If one is constrained to use plate-like samples, then an alternative approach to conventional microCT is needed. Imaging with X-ray phase contrast offers increased sensitivity compared to X-ray absorption-based techniques. Synchrotron X-ray phase contrast microradiographs (propagation method) coupled with multiple-angle stereometry are used to map the 3D position of fatigue crack surfaces within aluminum samples. The method is briefly outlined, and crack positions obtained with phase stereometry are found to agree with those determined from absorption microCT. Preliminary calculations of phase contrast derived from a sample fractured in fatigue are compared with phase micrographs of the same sample: at present agreement is only approximate.
| Original language | English (US) |
|---|---|
| Article number | 28 |
| Pages (from-to) | 253-260 |
| Number of pages | 8 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 5535 |
| DOIs | |
| State | Published - Dec 1 2004 |
| Event | Developments in X-Ray Tomography IV - Denver, CO, United States Duration: Aug 4 2004 → Aug 6 2004 |
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Keywords
- Aluminum
- Closure
- Cracks
- Fatigue
- MicroCT
- Tomography
- X-ray phase contrast
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
}
Phase contrast stereometry : Fatigue crack mapping in 3D. / Ignatiev, K. I.; Lee, W. K.; Fezzaa, K.; De Carlo, F.; Stock, Stuart R.
In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 5535, 28, 01.12.2004, p. 253-260.Research output: Contribution to journal › Conference article
TY - JOUR
T1 - Phase contrast stereometry
T2 - Fatigue crack mapping in 3D
AU - Ignatiev, K. I.
AU - Lee, W. K.
AU - Fezzaa, K.
AU - De Carlo, F.
AU - Stock, Stuart R
PY - 2004/12/1
Y1 - 2004/12/1
N2 - Plate-like samples are particularly challenging to reconstruct with computed tomography (CT) while preserving sensitivity to very small features within the sample. Specifically, quantifying fatigue crack openings of ≤ 2.5 μm in compact tension samples with maximum cross-sections of 25 mm is impractical with conventional microCT. If one is constrained to use plate-like samples, then an alternative approach to conventional microCT is needed. Imaging with X-ray phase contrast offers increased sensitivity compared to X-ray absorption-based techniques. Synchrotron X-ray phase contrast microradiographs (propagation method) coupled with multiple-angle stereometry are used to map the 3D position of fatigue crack surfaces within aluminum samples. The method is briefly outlined, and crack positions obtained with phase stereometry are found to agree with those determined from absorption microCT. Preliminary calculations of phase contrast derived from a sample fractured in fatigue are compared with phase micrographs of the same sample: at present agreement is only approximate.
AB - Plate-like samples are particularly challenging to reconstruct with computed tomography (CT) while preserving sensitivity to very small features within the sample. Specifically, quantifying fatigue crack openings of ≤ 2.5 μm in compact tension samples with maximum cross-sections of 25 mm is impractical with conventional microCT. If one is constrained to use plate-like samples, then an alternative approach to conventional microCT is needed. Imaging with X-ray phase contrast offers increased sensitivity compared to X-ray absorption-based techniques. Synchrotron X-ray phase contrast microradiographs (propagation method) coupled with multiple-angle stereometry are used to map the 3D position of fatigue crack surfaces within aluminum samples. The method is briefly outlined, and crack positions obtained with phase stereometry are found to agree with those determined from absorption microCT. Preliminary calculations of phase contrast derived from a sample fractured in fatigue are compared with phase micrographs of the same sample: at present agreement is only approximate.
KW - Aluminum
KW - Closure
KW - Cracks
KW - Fatigue
KW - MicroCT
KW - Tomography
KW - X-ray phase contrast
UR - http://www.scopus.com/inward/record.url?scp=15844401571&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=15844401571&partnerID=8YFLogxK
U2 - 10.1117/12.560201
DO - 10.1117/12.560201
M3 - Conference article
VL - 5535
SP - 253
EP - 260
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
SN - 0277-786X
M1 - 28
ER -