Direct observation of crack opening as a function of applied load in the interior of a notched tensile sample of AlLi 2090

Guvenilir, A.; Breunig, T.M.; Kinney, J.H.; Stock, Stuart R.

doi:10.1016/s1359-6454(96)00311-4

Cited by 107 publications

(67 citation statements)

References 11 publications

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“…3D characterizations of cracks in optically opaque materials using synchrotron X-ray microtomography is a recent research area triggered, in the late nineties, by the availability of third generation synchrotrons [66]. Since then, a growing number of papers has been published on that topic (see for example Ref.…”

Section: Discussionmentioning

confidence: 99%

Three dimensional experimental and numerical multiscale analysis of a fatigue crack

Rannou

Limodin

Réthoré

et al. 2010

Computer Methods in Applied Mechanics and Engineering

144

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A full three dimensional study of a fatigue crack in cast iron is presented. This analysis involves combining various tools, namely, Synchrotron X-ray microtomography Preprint submitted to Elsevier 4 October 2009of an in situ experiment, image acquisition and treatment, 3D volume correlation to measure 3D displacement fields, extraction of the crack geometry, extended digital image correlation to account for the crack displacement discontinuity, crack modeling in an elastic material exploiting the actual crack geometry, and finally estimation of stress intensity factors. All these different tasks are based on specific multiscale approaches.

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Section: Discussionmentioning

confidence: 99%

Three dimensional experimental and numerical multiscale analysis of a fatigue crack

Rannou

Limodin

Réthoré

et al. 2010

Computer Methods in Applied Mechanics and Engineering

144

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“…In many cases tomography suggests that the faces touch well before the conventional change in sample compliance during unloading normally associated with the onset of crack face contact. 305 This is not by itself confirmation that closure will affect crack growth since tomography cannot determine whether significant loads are borne across the faces.…”

Section: Quantitative 3d Fracture Mechanicsmentioning

confidence: 99%

Quantitative X-ray tomography

Maire¹,

Withers²

2013

International Materials Reviews

1,060

601

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X-ray computer tomography (CT) is fast becoming an accepted tool within the materials science community for the acquisition of 3D images. Here the authors review the current state of the art as CT transforms from a qualitative diagnostic tool to a quantitative one. Our review considers first the image acquisition process, including the use of iterative reconstruction strategies suited to specific segmentation tasks and emerging methods that provide more insight (e.g. fast and high resolution imaging, crystallite (grain) imaging) than conventional attenuation based tomography. Methods and shortcomings of CT are examined for the quantification of 3D volumetric data to extract key topological parameters such as phase fractions, phase contiguity, and damage levels as well as density variations. As a non-destructive technique, CT is an ideal means of following structural development over time via time lapse sequences of 3D images (sometimes called 3D movies or 4D imaging). This includes information needed to optimise manufacturing processes, for example sintering or solidification, or to highlight the proclivity of specific degradation processes under service conditions, such as intergranular corrosion or fatigue crack growth. Besides the repeated application of static 3D image quantification to track such changes, digital volume correlation (DVC) and particle tracking (PT) methods are enabling the mapping of deformation in 3D over time. Finally the use of CT images is considered as the starting point for numerical modelling based on realistic microstructures, for example to predict flow through porous materials, the crystalline deformation of polycrystalline aggregates or the mechanical properties of composite materials.

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“…In particular, cracks can be observed [47,48], their closure [49], ‡ The latter is sometimes referred to as Volumetric DIC or V-DIC and CODs measured by manually tracking particles [50]. When the crack morphology is determined, X-FEM techniques allow for the evaluation of surface vs. bulk propagation features [51].…”

Section: Introductionmentioning

confidence: 99%

Digital image correlation and fracture: an advanced technique for estimating stress intensity factors of 2D and 3D cracks

Roux¹,

Réthoré²,

Hild³

2009

J. Phys. D: Appl. Phys.

209

132

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Abstract. Digital image correlation is a measurement technique that allows one to retrieve displacement fields "separating" two digital images of the same sample at different stages of loading. Because of its remarkable sensitivity, it is not only possible to detect cracks with sub-pixel opening, which would not be visible, but also to provide accurate estimates of stress intensity factors. For this purpose suitable tools have been devised to minimize the sensitivity to noise. Working with digital images allows the experimentalist to deal with a wide range of scales from atomistic to geophysical one with the same tools. Various examples are shown at different scales, as well as some recent extensions to three dimensional cracks based on X-ray Computed micro-tomographic images.

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Direct observation of crack opening as a function of applied load in the interior of a notched tensile sample of AlLi 2090

Cited by 107 publications

References 11 publications

Three dimensional experimental and numerical multiscale analysis of a fatigue crack

Three dimensional experimental and numerical multiscale analysis of a fatigue crack

Quantitative X-ray tomography

Digital image correlation and fracture: an advanced technique for estimating stress intensity factors of 2D and 3D cracks

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