In situ 3D quantification of the evolution of creep cavity size, shape, and spatial orientation using synchrotron X-ray tomography

Isaac, Augusta; Sket, F.; Reimers, W.; Camin, Bettina; Sauthoff, Gerhard; Pyzalla, A.

doi:10.1016/j.msea.2007.05.108

Cited by 58 publications

(38 citation statements)

References 46 publications

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“…For instance, the damage development in particulate composites could be analyzed [11,13,14]. Creep has also been studied with such techniques [15][16][17][18]. One additional feature is to quantify kinematic fields via digital volume correlation (or DVC [19,20]).…”

Section: Introductionmentioning

confidence: 99%

Toward 4D mechanical correlation

Hild

Bouterf

Chamoin

et al. 2016

Adv. Model. and Simul. in Eng. Sci.

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Background: The goal of the present study is to illustrate the full integration of sensor and imaging data into numerical procedures for the purpose of identification of constitutive laws and their validation. The feasibility of such approaches is proven in the context of in situ tests monitored by tomography. The bridging tool consists of spatiotemporal (i.e., 4D) analyses with dedicated (integrated) correlation algorithms. Methods: A tensile test on nodular graphite cast iron sample is performed within a lab tomograph. The reconstructed volumes are registered via integrated digital volume correlation (DVC) that incorporates a finite element modeling of the test, thereby performing a mechanical integration in 4D registration of a series of 3D images. In the present case a non-intrusive procedure is developed in which the 4D sensitivity fields are obtained with a commercial finite element code, allowing for a large versatility in meshing and incorporation of complex constitutive laws. Convergence studies can thus be performed in which the quality of the discretization is controlled both for the simulation and the registration. Results: Incremental DVC analyses are carried out with the scans acquired during the in situ mechanical test. For DVC, the mesh size results from a compromise between measurement uncertainties and its spatial resolution. Conversely, a numerically good mesh may reveal too fine for the considered material microstructure. With the integrated framework proposed herein, 4D registrations can be performed and missing boundary conditions of the reference state as well as mechanical parameters of an elastoplastic constitutive law are determined in fair condition both for DVC and simulation.

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Section: Introductionmentioning

confidence: 99%

Toward 4D mechanical correlation

Hild

Bouterf

Chamoin

et al. 2016

Adv. Model. and Simul. in Eng. Sci.

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“…Traditional metallographic observations suggested that their shape ranges from almost spherical to a crack-like morphology for comparatively large cavities depending on the loading conditions. 352 Four types of cavity were identified by CT. 353 In the initial state, ellipsoidal cavities were dominant, but as creep progressed, while the total volume of all four types of cavities increased, the volume of spheres and rods grew far less rapidly than did ellipsoidal and complex shaped cavities. The predominance of ellipsoids and their total volume during primary and early stage of tertiary creep (a true secondary creep regime was not observed) suggests that surface diffusion around the cavity is rapid enough to maintain the shape of the growing cavity 354 at this stage.…”

Section: Void/damage Evolutionmentioning

confidence: 90%

Quantitative X-ray tomography

Maire¹,

Withers²

2013

International Materials Reviews

1,035

588

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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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“…To enhance cavity nucleation, the samples were first predeformed in tension at room temperature until a strain of 4.5 pct, after which they were mounted in a miniaturized creep machine specially developed for in-situ investigations. [27,28] The tensile stress at the beginning of the experiment was 25 MPa and was supplied by a string. The sample was asymmetrically heated at its lower part using an electric heating coil, which resulted in a constant temperature gradient (about 36.7 K mm À1 ) in the region of the sample with constant cross-sectional area.…”

Section: A Materials and Creep Testsmentioning

confidence: 99%

“…Experimentally, this can be achieved using nondestructive techniques allowing the identification and characterization of the evolution of single cavities. The investigation method partly satisfying these criteria is X-ray microtomography developed at synchrotron sources, [26] which has several advantages over the conventional techniques: (1) provides the 3-D morphology of cavities at progressive stages of creep, (2) makes visible the connectivity between cavities (voids may appear separated on 2-D sections), (3) clearly visualizes the inhomogeneity of damage distribution, [27][28][29][30][31][32] and (4) is free of specimen preparation artifacts.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Microtomographic Characterization of Single-Cavity Growth During High-Temperature Creep of Leaded Brass

Isaac

Dzięcioł

Sket

et al. 2011

Metall Mater Trans A

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International audienceSynchrotron microtomography was used for in-situ characterization of high-temperature creep damage in leaded brass. Applying image registration to subsequent tomographic reconstructions, the volumetric growth rate of single cavities with equivalent radii between 2 and 4.3 mu m was assessed. We conclude from the volume dependence of the growth rates that both the viscous flow and grain boundary (GB) diffusion mechanisms influence void growth. We show that void growth in leaded brass is retarded by negative stress triaxiality, which develops in the matrix during heating the specimen to the deformation temperature

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In situ 3D quantification of the evolution of creep cavity size, shape, and spatial orientation using synchrotron X-ray tomography

Cited by 58 publications

References 46 publications

Toward 4D mechanical correlation

Toward 4D mechanical correlation

Quantitative X-ray tomography

In-Situ Microtomographic Characterization of Single-Cavity Growth During High-Temperature Creep of Leaded Brass

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