Fast 4D On-the-Fly Tomography for Observation of Advanced Pore Morphology (APM) Foam Elements Subjected to Compressive Loading

Observation of dynamic testing by means of X-ray computed tomography (CT) and in-situ loading devices has proven its importance in material analysis already, yielding detailed 3D information on the internal structure of the object of interest and its changes during the experiment. However, the acquisition of the tomographic projections is, in general, a time-consuming task. The standard method for such experiments is the time-lapse CT, where the loading is suspended for the CT scan. On the other hand, modern X-ray tubes and detectors allow for shorter exposure times with an acceptable image quality. Consequently, the experiment can be designed in a way so that the mechanical test is running continuously, as well as the rotational platform, and the radiographic projections are taken one after another in a fast, free-running mode. Performing this so-called on-the-fly CT, the time for the experiment can be reduced substantially, compared to the time-lapse CT. In this paper, the advanced pore morphology (APM) foam elements were used as the test objects for in-situ X-ray microtomography experiments, during which series of CT scans were acquired, each with the duration of 12 s. The contrast-to-noise ratio and the full-width-half-maximum parameters are used for the quality assessment of the resultant 3D models. A comparison to the 3D models obtained by time-lapse CT is provided.

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Analysis of Advanced Pore Morphology (APM) Foam Elements Using Compressive Testing and Time-Lapse Computed Microtomography

Materials ◽

10.3390/ma14195897 ◽

2021 ◽

Vol 14 (19) ◽

pp. 5897

Author(s):

Matej Borovinsek ◽

Petr Koudelka ◽

Jan Sleichrt ◽

Michal Vopalensky ◽

Ivana Kumpova ◽

...

Keyword(s):

Internal Structure ◽

Mechanical Response ◽

Deformation Behaviour ◽

Compressive Loading ◽

Time Lapse ◽

Pore Morphology ◽

Time Resolved ◽

Computed Microtomography ◽

X Ray Computed ◽

Internal Deformation

Advanced pore morphology (APM) foam elements are almost spherical foam elements with a solid outer shell and a porous internal structure mainly used in applications with compressive loading. To determine how the deformation of the internal structure and its changes during compression are related to its mechanical response, in-situ time-resolved X-ray computed microtomography experiments were performed, where the APM foam elements were 3D scanned during a loading procedure. Simultaneously applying mechanical loading and radiographical imaging enabled new insights into the deformation behaviour of the APM foam samples when the mechanical response was correlated with the internal deformation of the samples. It was found that the highest stiffness of the APM elements is reached before the appearance of the first shear band. After this point, the stiffness of the APM element reduces up to the point of the first self-contact between the internal pore walls, increasing the sample stiffness towards the densification region.

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Time-lapse imaging of particle invasion and deposition in porous media using in situ X-ray radiography

Journal of Petroleum Science and Engineering ◽

10.1016/j.petrol.2019.02.061 ◽

2019 ◽

Vol 177 ◽

pp. 384-391 ◽

Cited By ~ 5

Author(s):

Jose R.A. Godinho ◽

Kuhan Chellappah ◽

Ian Collins ◽

Pei Ng ◽

Megan Smith ◽

...

Keyword(s):

Porous Media ◽

Time Lapse ◽

X Ray ◽

Time Lapse Imaging

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In Situ Monitoring of Phosphate Inhibitor Surface Deposition in the Cathodic Region during Corrosion of a Zinc Magnesium Aluminium Alloy Using Time-Lapse Microscopy and Energy Dispersive X-ray Spectroscopy

ECS Meeting Abstracts ◽

10.1149/ma2012-02/22/2255 ◽

2012 ◽

Keyword(s):

Aluminium Alloy ◽

Time Lapse ◽

In Situ Monitoring ◽

Energy Dispersive ◽

Surface Deposition ◽

X Ray ◽

Time Lapse Microscopy ◽

Cathodic Region

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In Situ Monitoring of Phosphate Inhibitor Surface Deposition during Corrosion of a Zinc Magnesium Aluminium (ZMA) Alloy Using Time-Lapse Microscopy and Energy Dispersive X-ray Spectroscopy

ECS Transactions ◽

10.1149/05031.0377ecst ◽

2013 ◽

Vol 50 (31) ◽

pp. 377-390 ◽

Cited By ~ 1

Author(s):

S. Mehraban ◽

J. H. Sullivan ◽

J. Elvins

Keyword(s):

Time Lapse ◽

In Situ Monitoring ◽

Energy Dispersive ◽

Surface Deposition ◽

X Ray ◽

Time Lapse Microscopy

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In situ time-lapse synchrotron radiation X-ray diffraction of silver corrosion

Journal of Analytical Atomic Spectrometry ◽

10.1039/c4ja00392f ◽

2015 ◽

Vol 30 (3) ◽

pp. 694-701 ◽

Cited By ~ 6

Author(s):

Rita Wiesinger ◽

Rosie Grayburn ◽

Mark Dowsett ◽

Pieter-Jan Sabbe ◽

Paul Thompson ◽

...

Keyword(s):

Synchrotron Radiation ◽

Gas Flow ◽

Time Lapse ◽

X Ray Diffraction ◽

X Ray ◽

Environmental Cell ◽

Temperature And Pressure ◽

Set Up ◽

Gaseous Corrosion

In order to study the initial corrosion processes of silver in the presence of corrosive gases in situ time-lapse XRD experiments were performed. The data collected using a newly combined environmental cell/gas flow set up introduces a set of highly useful tools for scientists to study time-lapse gaseous corrosion at ambient temperature and pressure.

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On the use of lock-in thermography to monitor delamination growth in composite panels under compression

Science and Engineering of Composite Materials ◽

10.1515/secm-2013-0156 ◽

2014 ◽

Vol 21 (4) ◽

pp. 485-492 ◽

Cited By ~ 5

Author(s):

Cinzia Toscano ◽

Aniello Riccio ◽

FrancescoPaolo Camerlingo ◽

Carosena Meola

Keyword(s):

Composite Structures ◽

Mechanical Test ◽

Compressive Loading ◽

Composite Panel ◽

Reinforced Polymer ◽

Catastrophic Failures ◽

Load Carrying ◽

Lock In ◽

Delamination Propagation

AbstractThe success of composites in automotive, aerospace, and naval applications is mainly related to their aptitude to be tailored to obtain a final product that perfectly fulfills the design requirements. However, during both manufacturing processes and maintenance, some flaws, like delaminations (which may escape simple visual inspection), may be induced in composite structures. The presence of delaminations is of major concern for the load-carrying capability of carbon fiber-reinforced polymer panels. Indeed, delaminations can strongly affect the structural strength and may grow under in-service loads, leading sometimes to catastrophic failures. The aim of this work is to explore the use of lock-in thermography for the monitoring of delamination propagation in composite structures when subjected to generic multiaxial loading conditions. A stiffened composite panel with an embedded skin delamination subjected to compressive loading was taken as a benchmark to assess experimentally the effectiveness of lock-in thermography for monitoring the delamination propagation in situ during the compressive mechanical test. The delamination size as a function of the applied load, observed by lock-in thermography during the execution of the compressive test, was used to validate the results of preliminary numerical computations.

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Mineral Precipitation in Fractures and Nanopores within Shale Imaged Using Time-Lapse X-ray Tomography

Minerals ◽

10.3390/min9080480 ◽

2019 ◽

Vol 9 (8) ◽

pp. 480 ◽

Cited By ~ 2

Author(s):

Godinho ◽

Ma ◽

Chai ◽

Storm ◽

Burnett

Keyword(s):

Time Lapse ◽

Growth Front ◽

Barium Sulphate ◽

General Sequence ◽

X Ray ◽

Sequence Of Events ◽

Subsurface Engineering ◽

Kinetics Of ◽

Over Time

Barite precipitation in fractures and nanopores within a shale sample is analysed in situ, in 3D, and over time. Diffusion of barium and sulphate from opposite sides of the sample creates a supersaturated zone where barium sulphate crystals precipitate. Time-lapse synchrotron-based computed tomography was used to track the growth of precipitates over time, even within the shale’s matrix where the nanopores are much smaller than the resolution of the technique. We observed that the kinetics of precipitation is limited by the type and size of the confinement where crystals are growing, i.e., nanopores and fractures. This has a major impact on the ion transport at the growth front, which determines the extent of precipitation within wider fractures (fast and localised precipitation), thinner fractures (non-localised and slowing precipitation) and nanopores (precipitation spread as a front moving at an approximately constant velocity of 10 ± 3 µm/h). A general sequence of events during precipitation in rocks containing pores and fractures of different sizes is proposed and its possible implications to earth sciences and subsurface engineering, e.g., fracking and mineral sequestration, are discussed.

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The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100071107 ◽

1973 ◽

Vol 31 ◽

pp. 132-133 ◽

Cited By ~ 1

Author(s):

R. E. Herfert

Keyword(s):

Surface Characterization ◽

Analytical Techniques ◽

X Ray Diffraction ◽

Depth Of Penetration ◽

X Ray ◽

The Past ◽

Transmission Electron ◽

Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

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