Quantification of the interaction within defect populations on fatigue behavior in an aluminum alloy

Li, P.; Lee, Peter; Maijer, Daan M.; Lindley, T.C.

doi:10.1016/j.actamat.2009.04.008

Cited by 104 publications

(35 citation statements)

References 27 publications

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“…In cast metals (aluminium and magnesium), the complex shape of the initial morphology of the shrinkage pores is the key parameter determining their tensile 216 and fatigue properties. [217][218][219][220] In all these cases, the size of each cavity, as well as its sphericity, distance to the interface and projected surface perpendicular to the tensile direction, has been used for a better prediction of the fatigue crack initiation probability on each cavity. An example of such a quantification in Ref.…”

Section: Inclusion/matrix Morphologiesmentioning

confidence: 99%

Quantitative X-ray tomography

Maire¹,

Withers²

2013

International Materials Reviews

1,088

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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Section: Inclusion/matrix Morphologiesmentioning

confidence: 99%

Quantitative X-ray tomography

Maire¹,

Withers²

2013

International Materials Reviews

1,088

601

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“…15 On the other hand, experimentally, the interaction between the pores and the crack is especially pronounced when the micropores are near the fatigue crack tip, resulting in a higher crack growth rate along the crack front. 7 This behaviour indicates that there exists significant interaction between gas pores and fatigue cracks inside the 7075-T6 hybrid welds, which provides positive stimulation for porosity induced fatigue crack initiation and propagation. Figure 8 further presents the evolution of porosity induced fatigue cracking.…”

Section: Porosity Induced Damage and Crackingmentioning

confidence: 93%

Porosity induced fatigue damage of laser welded 7075-T6 joints investigated via synchrotron X-ray microtomography

Chen

Zhang

et al. 2015

Science and Technology of Welding and Joining

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The interaction between the pores and the fatigue damage in 7075-T6 joints was characterised via high resolution synchrotron radiation X-ray microcomputed tomography. The spatial distribution and growth behaviour of the pores were investigated and quantified. The gas porosity inside 7075-T6 hybrid welds was found to play a significant role in the fatigue crack nucleation and propagation process. The volume fraction and the total number of pores increased slightly with increasing number of fatigue cycles, which provides a key indicator for the damage evolution. Experimental results indicate that the micropores grew and distorted during fatigue cyclic loading, eventually resulting in fatigue cracks. Under cyclic loads, the maximum micropore is usually not a favourable site, in terms of physical suitability, for fatigue crack initiation and propagation, and the diameter of the cracked pores is in the range of 10-100 mm.

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“…However, the presence of casting defects such as gas or shrinkage porosities and oxides is unavoidable because it is related to the actual industrial casting processes. Such defects are responsible for an important degrade of both static 1,2 and dynamic 3,4 mechanical properties. For that reason, several papers have been focused on the improvement of the alloy behaviour starting from the study of the morphology, distribution, and size of such discontinuities.…”

Section: Introductionmentioning

confidence: 99%

A356‐T6 wheels: Influence of casting defects on fatigue design

Tebaldini

Petrogalli

Donzella

et al. 2018

Fatigue Fract Eng Mat Struct

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Rotating bending fatigue tests were executed on A356‐T6 wheels. The tests were performed both on components containing only the casting defects and on wheels in which artificial holes were machined. Results show the detrimental effect of sub‐superficial porosities on fatigue endurance. A predictive model was proposed. It resulted in a useful tool for the designer because knowing the applied stress, it is possible to estimate the number of cycles for crack nucleation considering the size of the defect, whereas knowing the endurance target requested it is possible to find the maximum defect size acceptable considering the applied stress.

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Quantification of the interaction within defect populations on fatigue behavior in an aluminum alloy

Cited by 104 publications

References 27 publications

Quantitative X-ray tomography

Quantitative X-ray tomography

Porosity induced fatigue damage of laser welded 7075-T6 joints investigated via synchrotron X-ray microtomography

A356‐T6 wheels: Influence of casting defects on fatigue design

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