Understanding fatigue crack growth in aluminum alloys by in situ X-ray synchrotron tomography

Williams, Jason; Yazzie, Kyle; Padilla, E.; Chawla, Nikhilesh; Xiao, Xianghui; Carlo, Francesco De

doi:10.1016/j.ijfatigue.2012.06.009

Cited by 77 publications

(30 citation statements)

References 25 publications

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“…The fatigue crack growth rates obtained from these experiments [12,15] were comparable to published data by others [21]. The errors in the ΔK (stress intensity factor range) measurements were up to a maximum of only 7% due to error in measurement of force.…”

Section: Tensile and Fatigue Behaviorsupporting

confidence: 85%

“…Using the second loading stage shown in Figure 3, in situ fatigue crack growth tomography was performed on AA7075-T651 samples [12,13]. The fatigue crack growth rates obtained from these experiments [12,15] were comparable to published data by others [21].…”

Section: Tensile and Fatigue Behaviorsupporting

confidence: 77%

“…More recently, in situ mechanical testing has become more attractive, as a means of visualizing and quantifying microstructural changes as a function of time. Experiments under tension [8][9][10], cyclic loading [11][12][13][14], corrosion-fatigue [15], and creep [16,17] have been conducted.…”

Section: Introductionmentioning

confidence: 99%

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In situ experimental techniques to study the mechanical behavior of materials using X-ray synchrotron tomography

Singh

Williams

Hruby

et al. 2014

Integr Mater Manuf Innov

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In situ X-ray synchrotron tomography is an excellent technique for understanding deformation behavior of materials in 4D (the fourth dimension here is time). However, performing in situ experiments in synchrotron is challenging, particularly in regard to the design of the mechanical testing stage. Here, we report on several in situ testing methods developed by our group in collaboration with Advanced Photon source at Argonne National Laboratory used to study the mechanical behavior of materials. The issues associated with alignment during mechanical testing along with the improvements made to the in situ mechanical testing devices, over time, are described.In situ experiments involving corrosion-fatigue and stress corrosion cracking in various environments are presented and discussed. These include fatigue loading of metal matrix composites (MMCs), corrosion-fatigue, and stress corrosion cracking of Al 7075 alloys.

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Section: Tensile and Fatigue Behaviorsupporting

confidence: 85%

Section: Tensile and Fatigue Behaviorsupporting

confidence: 77%

See 1 more Smart Citation

In situ experimental techniques to study the mechanical behavior of materials using X-ray synchrotron tomography

Singh

Williams

Hruby

et al. 2014

Integr Mater Manuf Innov

View full text Add to dashboard Cite

show abstract

“…[27][28][29] Thus, three-dimensional (3D) characterization of both the structure and the damage processes is essential and of great value. 30,31 The purpose of this work was to characterize creep crack growth by use of x-ray computer tomography (XCT), a non-destructive technique for detection of damage. Observation of creep crack growth is expected to promote better understanding of the mechanism of fracture of nano-silver sintered joints.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Visualization of the Crack-Growth Behavior of Nano-Silver Joints During Shear Creep

Tan

Chen

et al. 2014

Journal of Elec Materi

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Evolution of creep damage in nano-silver sintered lap shear joints was investigated at 325°C. Non-destructive x-ray three-dimensional (3D) visualization clearly revealed the crack-growth behavior of the joint; this could be divided into three stages. In the initial stage, little development of cracks occurred. In the second stage, cracks propagated at a consistent rate. In the final stage, rapid extension of the cracks led directly to fracture of the joint. Three-dimensional volume-rendered images and fractographic analysis showed that the growth of macroscopic initial cracks at the interfaces dominated the creep fracture process. Initial failure of nano-silver sintered lap shear joints often occurred at interfacial nano-silver paste layers. Both the size and position of the initial interfacial cracks had significant effects on the final creep failure of the joints, and higher stresses led to greater porosity and earlier failure.

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“…Alternatively, different subsequent scans can be performed in order to obtain the subsets, assuming the object remained unchanged during each scan. Examples of this technique can be found in non-destructive material tests [10], soil structure and water retention studies [11] or observations of root growth [12]. Reconstruction quality of standard subset-reconstruction techniques can be improved by enforcing similarity among the subsets with regularization strategies [13].…”

mentioning

confidence: 99%

Region-Based Iterative Reconstruction of Structurally Changing Objects in CT

Eyndhoven

Batenburg

Sijbers

2014

IEEE Trans. on Image Process.

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Abstract-X-ray computed tomography (CT) is a powerful tool for noninvasive imaging of time-varying objects. In the past, methods have been proposed to reconstruct images from continuously changing objects. For discretely or structurally changing objects, however, such methods fail to reconstruct high quality images, mainly because assumptions about continuity are no longer valid. In this paper, we propose a method to reconstruct structurally changing objects. Starting from the observation that there exist regions within the scanned object that remain unchanged over time, we introduce an iterative optimization routine that can automatically determine these regions and incorporate this knowledge in an algebraic reconstruction method. The proposed algorithm was validated on simulation data and experimental μCT data, illustrating its capability to reconstruct structurally changing objects more accurately in comparison to current techniques.

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Understanding fatigue crack growth in aluminum alloys by in situ X-ray synchrotron tomography

Cited by 77 publications

References 25 publications

In situ experimental techniques to study the mechanical behavior of materials using X-ray synchrotron tomography

In situ experimental techniques to study the mechanical behavior of materials using X-ray synchrotron tomography

Three-Dimensional Visualization of the Crack-Growth Behavior of Nano-Silver Joints During Shear Creep

Region-Based Iterative Reconstruction of Structurally Changing Objects in CT

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