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Liu, C.; Huang, Yonggang; Lovato, Manuel L.; Stout, M.G.

doi:10.1023/a:1007419406590

Cited by 44 publications

(4 citation statements)

References 31 publications

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“…Fracture toughness is commonly measured under tensile loads, or in the compressive Brazilian test, but a more useful geometry would stabilise the fracture process to aid accurate measurement of key quantities. Our adopted technique allowed for controlled crack growth that improved upon the traditional 3-and 4-point bend tests, Brazil tests, and Brazil tests with initial damage [4,5,8,9]. Indeed, one of the challenges of measuring K IC using the conventional crack tip opening displacement (CTOD) technique, is that the fatigue crack initiation load and the monotonic crack growth load, are closer in magnitude than the best practice methods requires [3].…”

Section: Methodsmentioning

confidence: 99%

Fundamental considerations in fracture in nuclear materials

Cady

Eastwood

Bourne

et al. 2018

AIP Conference Proceedings

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The motivation of this work is to derive a means of monitoring the structural integrity of components used in nuclear power plants since there are a diverse range of materials, under variable loading, with a range of prior loading histories under complex environmental conditions. An experimental technique has been developed to characterize brittle materials which, using linear elastic fracture mechanics, has given accurate measurements of the global quantity fracture toughness. Here we extend this geometry to X-ray measurements in order to track the crack front as a function of loading parameters as well as to determine the crack surface area as loads increase. We have applied these advances to fracture in beryllium, to determine the onset of damage within the target as strain increases. Further, visualization of crack front advance and the correlated strain fields that are generated during the experiments, have allowed determination of the fracture surface generated as a function of load. This accurate tracking of the micromechanics controlling the energy balance in dynamic failure will provide a vital step in validating multiscale predictive modelling. By these means we aim to produce a micro-and mesoscale justification for macroscale concepts such as K IC.

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Section: Methodsmentioning

confidence: 99%

Fundamental considerations in fracture in nuclear materials

Cady

Eastwood

Bourne

et al. 2018

AIP Conference Proceedings

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“…The Brazilian disk specimen has also been used to study the fracture toughness of bimaterial systems [11] and a unidirectional fiber-reinforced composite under mixedmode loading conditions [16,28].…”

Section: Sbn Specimensmentioning

confidence: 99%

“…A number of test specimens have been proposed to measure interfacial fracture toughness [10][11][12][13][14][15][16]. Suo and Hutchinson [17] developed a universal relation to associate the actual stress intensity factor for an interface crack between a very thin layer of secondary material and bulk material with the apparent stress intensity factor for a similar crack in the bulk material without the interlayer.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of interfacial toughness curves

Lee

2002

Met. Mater. Int.

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The evaluation of mixed-mode interfacial fracture toughness is of great importance for the integrity of electronic devices because interfacial cracks are subjected to mixed-mode loading by vapor pressure, thermal stress and other factors. A lot of work has been done to clarify the unusual characteristics of the fracture of bimaterial interfaces. Since interfacial fracture toughness (G C ) greatly depends on phase angle (ψ), most work has focused on the determination of G C -ψ curves using various specimens. However, this requires a lot of time, expense and effort. In this work, the G C -ψ curves of oxidized Cu-based leadframe/EMC (epoxy molding compound) interfaces were determined by measuring interfacial fracture toughness under mode-I, mode-II and mixed-mode loading conditions using sandwiched-double-cantilever-beam (SDCB) specimens, Arcan specimens and sandwiched-Brazilian-nut (SBN) specimens, respectively. The experimental results showed that the measured G C -ψ curves obeyed the G C -ψ expression proposed by Ahmad first developed by Evans and Hutchinson based on the micromechanics modeling of mixed-mode fracture. Comparing data in the literature, the G C -ψ expression proposed by Ahmad was confirmed to be valid, and a method of predicting G C -ψ curves without much experiment was proposed.

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“…It is strongly believed that fracture toughness is the property that is most sensitive to chemical and microstructural changes that occur in these materials. Initial characterization was pursued using several common techniques including 3 and 4 point bend tests, Brazil tests, and Brazil tests with initial damage [2][3][4][5][6]. Each of these test geometries were non-ideal because the crack growth rates were not easily controlled and there was significant variability in test results.…”

Section: Introductionmentioning

confidence: 99%

Determination of dynamic fracture toughness using a new experimental technique

Cady

Liu

Lovato

2015

EPJ Web of Conferences

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Abstract. In other studies dynamic fracture toughness has been measured using Charpy impact and modified Hopkinson Bar techniques. In this paper results will be shown for the measurement of fracture toughness using a new test geometry. The crack propagation velocities range from ∼0.15 mm/s to 2.5 m/s. Digital image correlation (DIC) will be the technique used to measure both the strain and the crack growth rates. The boundary of the crack is determined using the correlation coefficient generated during image analysis and with interframe timing the crack growth rate and crack opening can be determined. A comparison of static and dynamic loading experiments will be made for brittle polymeric materials. The analysis technique presented by Sammis et al.[1] is a semi-empirical solution, however, additional Linear Elastic Fracture Mechanics analysis of the strain fields generated as part of the DIC analysis allow for the more commonly used method resembling the crack tip opening displacement (CTOD) experiment. It should be noted that this technique was developed because limited amounts of material were available and crack growth rates were to fast for a standard CTOD method.

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Untitled

Cited by 44 publications

References 31 publications

Fundamental considerations in fracture in nuclear materials

Fundamental considerations in fracture in nuclear materials

Experimental determination of interfacial toughness curves

Determination of dynamic fracture toughness using a new experimental technique

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