Development and validation of a material-labeling method for powder process characterization using X-ray computed tomography

Yang, Chia-Yi; Fu, Xi-Yong

doi:10.1016/j.powtec.2004.06.011

Cited by 39 publications

(14 citation statements)

References 28 publications

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“…In neither case was the resolution of the method clearly stated, but in the case of Ohgaki et al [23], spatial resolution appears to be on the order of some micrometers, albeit with significant noise in the strain data. Similar methods, but based on an addition of artificial markers, have also been used to study powder compaction and mixing, where a small number of lead-acetate impregnated cellulose particles were individually tracked among normal particles during compaction [24]. For the study of full-field local strain distributions, Nielsen et al [25] and Haldrup et al [26] have presented two similar methods by which a large number of artificially introduced markers are individually tracked in the bulk of solid aluminium samples in upsetting tests.…”

Section: Strain Measurements Using X-ray Tomographymentioning

confidence: 99%

A General Methodology for Full-Field Plastic Strain Measurements Using X-ray Absorption Tomography and Internal Markers

Haldrup¹,

Nielsen

Wert³

2007

Exp Mech

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Probing the strain locally and throughout the bulk of various materials has long been of interest in Materials Science. This article presents a general methodology for assessing the plastic strain in terms of the displacement gradient tensor throughout the bulk of opaque samples. The method relies on a homogenous distribution of marker particles throughout the bulk of a sample, markers which are detected through the application of synchrotron X-ray tomography. Making use of the morphology of individual markers, motion of individual markers is tracked during deformation allowing the local displacement field to be determined throughout the bulk. The local displacement gradient tensor is derived from the displacement field. Spatial resolution is directly related to marker particle density in the sample, here 30 μm. The accuracy of the displacement gradient tensor calculation is dependent on the accuracy with which each marker position is determined and is shown to be in the range from 0.005 to 0.012.

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Section: Strain Measurements Using X-ray Tomographymentioning

confidence: 99%

A General Methodology for Full-Field Plastic Strain Measurements Using X-ray Absorption Tomography and Internal Markers

Haldrup¹,

Nielsen

Wert³

2007

Exp Mech

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“…projections of a 3D object, CT allows for multiple projections of the object to be acquired in a manner such that individual cross sectional slices as well as the entire 3D structure can be reconstructed [166].…”

Section: X-ray Computed Tomographymentioning

confidence: 99%

Review of noninvasive methods to characterize granular mixing

Nadeem

Heindel

2018

Powder Technology

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Granular mixing is a common process observed in a variety of industries such as construction, chemical processing, food handling, and cosmetics and pharmaceutical manufacturing. Over the years several methods have been devised to characterize granular mixing and to provide information on the quality of the mixture as well as mixing end points. In this work, three different noninvasive measurement categories are reviewed, namely: velocimetric, spectroscopic, and tomographic techniques. Velocimetric techniques such as Particle Image Velocimetry (PIV) and Radioactive particle tracking (RPT) are able to provide the trajectories and velocities of individual particles during the mixing process. Spectroscopic techniques focus on the chemical composition of the sample and are well suited for applications where there is little difference in the physical properties of the constituents such as particle size and density. Tomographic techniques such as X-ray computed tomography (CT) and Magnetic Resonance Imaging (MRI) provide information such as the spatial distribution of the different constituents in the sample and are useful in determining dead zones and inhomogeneities. A few other techniques are also discussed, particularly passive acoustic methods which, though can neither provide spatial distribution nor individual particle trajectories, are still useful and can be employed to determine mixing end points. The objective of the work is to provide a comparative assessment of the various noninvasive techniques and discuss their ability to effectively characterize the mixing process. The reported techniques will be reviewed thoroughly based on their functionality, viability, and characterization capability. The advantages and disadvantages of the various techniques are summarized and a comparison of the utility of the techniques in various applications is discussed.

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“…Ideally, these are inline methods to remove issues related to extractive sampling and allow direct monitoring of the system using various sensors. Many technologies have been investigated, including near-infrared spectroscopy 1-3 , Raman spectroscopy 4 , magnetic resonance imaging 5 , radioactive tracers 6 , image analysis 7 , tomography 8 and acoustic emission monitoring 9,10 .…”

Section: Introductionmentioning

confidence: 99%