Quantitative Characterization of Damage in a Composite Material Using X-Ray Tomographic Microscopy

Breunig, T.M.; Elliott, J. C.; Stock, Stuart R.; Anderson, Philip S. L.; Davis, Graham; Guvenilir, A.

doi:10.1007/978-3-540-46887-5_106

Cited by 11 publications

(7 citation statements)

References 3 publications

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“…83 mm at the highest applied stress). The relatively large voxels in the reconstruction limited sensitivity so that the relatively small openings near the crack tip could not be detected (previous work has shown that crack openings down to one-tenth of the edge of a voxel can be detected in absorption microCT; 19,25,26 here this corresponds to 2-3 mm opening). The final crack length measured with microCT was 6 .…”

Section: Sensitivitymentioning

confidence: 99%

“…voxels containing some solid and the remainder empty space. Breunig et al 25,26 showed that partial volumes of a crack in a uniform matrix could be quantified down to one-tenth of a voxel; Toda et al 19 later concluded that similar sensitivity was possible in their synchrotron microCT data of small cracked specimens. The relationship between the decrease in observed linear attenuation coefficient and fraction of voxel occupied by the crack is given elsewhere in the present paper (equation ( 3)).…”

Section: Introductionmentioning

confidence: 99%

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MicroCT (microtomography) quantification of microstructure related to macroscopic behaviour: Part 1 – Fatigue crack closure measured in situ in AA 2090 compact tension samples

Ignatiev¹,

Davis²,

Elliott³

et al. 2006

Materials Science and Technology

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Microcomputed tomography (microCT) quantified crack opening in situ in a small compact tension specimen (AA 2090 T8E41) as a function of 3D position and of applied load. The same specimen was observed twice at two crack lengths. Some crack face areas were dominated by large asperities, while others were relatively flat. Large openings followed the sides of large asperities, with small openings elsewhere. The crack path and pattern of openings are discussed in terms of the variation in mesotexture. Before and after the crack extension, the pattern of open (and closed) voxels did not appear to change, suggesting that contact at a point near the crack tip will continue at the same portion of the fatigue cycle after the tip has receded. Testing parameters and macroscopic closure measurements link the present microCT measurements to studies in the literature.

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Section: Sensitivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MicroCT (microtomography) quantification of microstructure related to macroscopic behaviour: Part 1 – Fatigue crack closure measured in situ in AA 2090 compact tension samples

Ignatiev¹,

Davis²,

Elliott³

et al. 2006

Materials Science and Technology

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“…6 mm voxels (as was carried out in the present study) should allow detection of damage at the 1-2 mm level (i.e. crack openings on the order of one micrometer) 9,11 and at the same time allow specimen cross-sections to be ,361 . 5 mm.…”

Section: Discussionmentioning

confidence: 92%

MicroCT (microtomography) quantification of microstructure related to macroscopic behaviour: Part 2 – Damage in SiC–Al monofilament composites tested in monotonic tension and fatigue

Breunig¹,

Kinney²,

Stock³

2006

Materials Science and Technology

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The present paper reports results of monotonic tensile and of fatigue testing of an aligned monofilament composite SiC-Al. Macroscopic measures of damage (changes in unloading compliance and in unrecovered strain) correlate with noninvasive X-ray microCT (microtomography) quantification of microstructure (alteration of fibre separation, fibre misorientation relative to the load axis and amount of fibre fracture). Monotonic loading beyond yield (188 MPa) alters fibre arrangement and reduces fibre misorientation. Fracture of fibre carbon cores begins at 828 MPa and increases rapidly with rising stress concomitant with marked unloading modulus decreases and permanent strain increases. Fatigue at 621 MPa produces gradually increasing modulus and unrecovered strain with no evidence of fibre damage. At low cycles, the modulus, permanent strain and fraction of fractured C cores increase while fibre misorientation decreases; above 16 cycles, modulus decreases with gradual increases in the other quantities. Fracture in SiC could only be observed after the specimen broke.

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“…The scintillatorscreen is effectively grainless,hence the resolution of the system is determined primarily by the combination of the resolution of the objective and the CCD pixel size. Using the Rayleigh criterion, the resolution of the objective can be estimated to be (1) The CCD has a pixel size of 6.8 pm, correspoondlng to roughly a 1.4pm pixel size at the sample plane. Therefore we estimate the resolution of the images to be about 3 pm (or 2 pixels).…”

Section: Data Acquisition Systemmentioning

confidence: 99%

<title>Quasi-real-time x-ray microtomography system at the Advanced Photon Source</title>

et al. 1999

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The combination of high-brilliance x-ray sources, fast detector systems, wide-bandwidth networks, and parallel computers can substantially reduce the time required to acquire, reconstruct, and visufllze high-resolution threedimensionaltomographic data sets. A quasi-realtimecomputed x-ray microtomography system has been implemented at the 2-BM beamline at the Advanced Photon Source at Argome National Laboratory. With this system, a complete tomographic data set can be collected in about 15 minutes. Immediately after each projection is obtained, it is rapidly transferredto the Mathematicsand Computing SciencesDivision where preprocessingand reconstruction calculations are performed concurrently with the data acquisition by a SGI parallel computer. The reconstruction results, once completed, are transferredto a visufllzation computer that performs the volume rendering calculations. Rendered images of the reconstructed data are available for viewing back at the beamline experiment station minutes after the data acquisition was complete. The fully pipeliied data acquisition and reconstruction system also gives us the option to acquire the tomographic data set in several cycles, initially with coarse then with fine angular steps. At present the projections are acquired with a straight-ray projection imaging scheme using 5-20 keV hard x rays in either phase or amplitude contrast mode at a 1-10 pm resolution. In the i%ture,we expect to increase the resolution of the projections to below 100 nm by using a focused x-ray beam at the 2-ID-B beamline and to reduce the combined acquisition and computation time to the 1 min scale with improvements in the detectors, network links, software pipeliie, and computation algorithms.

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Quantitative Characterization of Damage in a Composite Material Using X-Ray Tomographic Microscopy

Cited by 11 publications

References 3 publications

MicroCT (microtomography) quantification of microstructure related to macroscopic behaviour: Part 1 – Fatigue crack closure measured in situ in AA 2090 compact tension samples

MicroCT (microtomography) quantification of microstructure related to macroscopic behaviour: Part 1 – Fatigue crack closure measured in situ in AA 2090 compact tension samples

MicroCT (microtomography) quantification of microstructure related to macroscopic behaviour: Part 2 – Damage in SiC–Al monofilament composites tested in monotonic tension and fatigue

<title>Quasi-real-time x-ray microtomography system at the Advanced Photon Source</title>

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