scholarly journals Digital Volume Correlation Applied to X-ray Micro-Tomography Images in Uniaxial Creep Tests on Anisotropic Clayey Rock

2020 ◽  
Vol 10 (14) ◽  
pp. 4898
Author(s):  
Hailing Shi ◽  
Jerome Hosdez ◽  
Thomas Rougelot ◽  
Shouyi Xie ◽  
Jianfu Shao ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Clayey Rock ◽  
Digital Volume Correlation ◽  
Creep Tests ◽  
Structural Anisotropy ◽  
Strain Fields ◽  
X Ray ◽  
Bedding Planes ◽  
Uniaxial Creep ◽  
Micro Tomography

Creep tests are commonly performed to characterize time-dependent deformation of geological materials. Classical measuring methods are not suitable for long term tests and not able to provide full three-dimensional strain fields. In this study, Digital Volume Correlation (DVC) is applied to X-ray micro-tomography (XRMT) images from creep tests on a hard clayey rock. In situ uniaxial compression creep tests are performed under different levels of stress and with different loading orientations with respect to the structural anisotropy of rock. Based on the XRMT images taken during the creep tests, DVC is applied to compute the full three dimensional strain fields and global averages strains of tested samples. The effects of bedding planes and hard inclusions on the non-uniform distribution of strains are analyzed.

scholarly journals Investigating the Three-Dimensional Microstructural Characteristics of Lithium-Sulfur Electrodes with X-ray Micro-Tomography

2017 ◽  
Vol 77 (11) ◽  
pp. 447-455 ◽  
Author(s):  
Chun Tan ◽  
Sohrab Randjbar Daemi ◽  
Daniel J.L. Brett ◽  
Paul R. Shearing
Keyword(s):  
Three Dimensional ◽  
Microstructural Characteristics ◽  
X Ray ◽  
Micro Tomography ◽  
Lithium Sulfur

Identification of strain fields in pure Al and hybrid Ni/Al metal foams using X-ray micro-tomography under loading

2016 ◽  
Vol 11 (11) ◽  
pp. C11017-C11017 ◽  
Author(s):  
T. Fíla ◽  
O. Jiroušek ◽  
A. Jung ◽  
I. Kumpová
Keyword(s):  
Metal Foams ◽  
Strain Fields ◽  
X Ray ◽  
Micro Tomography

scholarly journals Synchrotron radiation X-ray tomographic microscopy (SRXTM) of brachiopod shell interiors for taxonomy: Preliminary report

2010 ◽  
pp. 109-117 ◽  
Author(s):  
Neda Motchurova-Dekova ◽  
David Harper
Keyword(s):  
Synchrotron Radiation ◽  
Three Dimensional ◽  
X Rays ◽  
X Ray ◽  
Fine Grained ◽  
Internal Structures ◽  
Efficient Alternative ◽  
Micro Tomography ◽  
Light Beams ◽  
Non Destructive

Synchrotron radiation X-ray tomographic microscopy (SRXTM) is a non-destructive technique for the investigation and visualization of the internal features of solid opaque objects, which allows reconstruction of a complete three-dimensional image of internal structures by recording of the differences in the effects on the passage of waves of energy reacting with those structures. Contrary to X-rays, produced in a conventional X-ray tube, the intense synchrotron light beams are sharply focused like a laser beam. We report encouraging results from the use of SRXTM for purely taxonomic purposes in brachiopods: an attempt to find a non-destructive and more efficient alternative to serial sectioning and several other methods of dissection together with the non-destructive method of X-ray computerised micro-tomography. Two brachiopod samples were investigated using SRXTM. In ?Rhynchonella? flustracea it was possible to visualise the 3D shape of the crura and dental plates. In Terebratulina imbricata it was possible to reveal the form of the brachidium. It is encouraging that we have obtained such promising results using SRXTM with our very first two fortuitous samples, which had respectively fine-grained limestone and marl as infilling sediment, in contrast to the discouraging results communicated to us by some colleagues who have tested specimens with such infillings using X-ray micro-tomography. In future the holotypes, rare museum specimens or delicate Recent material may be preferentially subjected to this mode of analysis.

scholarly journals Three-Dimensional Investigation of Free-Edge Effects in Laminate Composites Using X-ray Tomography and Digital Volume Correlation

2014 ◽  
Vol 55 (1) ◽  
pp. 301-311 ◽  
Author(s):  
P. Lecomte-Grosbras ◽  
J. Réthoré ◽  
N. Limodin ◽  
J.-F. Witz ◽  
M. Brieu
Keyword(s):  
Edge Effects ◽  
Three Dimensional ◽  
Free Edge ◽  
Digital Volume Correlation ◽  
Laminate Composites ◽  
X Ray

scholarly journals Virtual paleontology: computer-aided analysis of fossil form and function

2014 ◽  
Vol 88 (4) ◽  
pp. 633-635 ◽  
Author(s):  
Imran A. Rahman ◽  
Selena Y. Smith
Keyword(s):  
Imaging Techniques ◽  
Three Dimensional ◽  
Fossil Plants ◽  
Element Analysis ◽  
X Ray ◽  
Form And Function ◽  
Wide Range ◽  
History Of ◽  
Micro Tomography ◽  
And Function

‘Virtual paleontology’ entails the use of computational methods to assist in the three-dimensional (3-D) visualization and analysis of fossils, and has emerged as a powerful approach for research on the history of life. Three-dimensional imaging techniques allow poorly understood or previously unknown anatomies of fossil plants, invertebrates, and vertebrates, as well as microfossils and trace fossils, to be described in much greater detail than formerly possible, and are applicable to a wide range of preservation types and specimen sizes (Table 1). These methods include non-destructive high-resolution scanning technologies such as conventional X-ray micro-tomography and synchrotron-based X-ray tomography. In addition, form and function can be rigorously investigated through quantitative analysis of computer models, for example finite-element analysis.

A DIGITAL VOLUME CORRELATION TECHNIQUE FOR 3-D DEFORMATION MEASUREMENTS OF SOFT GELS

2011 ◽  
Vol 03 (02) ◽  
pp. 335-354 ◽  
Author(s):  
JIANYONG HUANG ◽  
XIAOCHANG PAN ◽  
SHANSHAN LI ◽  
XIAOLING PENG ◽  
CHUNYANG XIONG ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Three Dimensional ◽  
Laser Scanning Confocal Microscopy ◽  
Image Correlation ◽  
Digital Volume Correlation ◽  
Correlation Technique ◽  
Strain Fields ◽  
Measurement Capability ◽  
Soft Gels ◽  
Deformation Measurements

This paper develops a set of digital volume correlation (DVC) algorithms to address 3-D deformation measurements of soft gels with the aid of laser-scanning confocal microscopy. As an extension of the well-developed digital image correlation (DIC) method, the present DVC approach adopts a three-dimensional zero-normalized cross-correlation criterion (3-D ZNCC) to perform volume correlation calculations. Based on a 3-D sum-table scheme and the fast Fourier transform technique, a fast algorithm is first proposed to accelerate the integer-voxel correlation computations. Subsequently, two kinds of sub-voxel registration algorithms, i.e., 3-D gradient-based algorithm and 3-D Newton–Raphson algorithm, are presented to obtain the sub-voxel displacement and strain fields of volume images before and after deformation. Both a series of computer-simulated digital volume images and an actual agarose gel sample randomly embedded with fluorescent particles are employed to verify the 3-D deformation measurement capability of the proposed DVC algorithms, which indicates that they are competent to acquire 3-D displacement and strain fields of soft gels.

Damage Mechanism of Hybrid Welded 7020 Aluminium Alloy Based on Three-Dimensional X-Ray Micro-Tomography and GTN Model

2016 ◽  
Vol 43 (10) ◽  
pp. 1002005 ◽  
Author(s):  
段浩 Duan Hao ◽  
吴圣川 Wu Shengchuan ◽  
徐忠伟 Xu Zhongwei ◽  
张志良 Zhang Zhiliang ◽  
阚前华 Kan Qianhua ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Three Dimensional ◽  
Damage Mechanism ◽  
Gtn Model ◽  
X Ray ◽  
Micro Tomography
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