The role of heterogeneous deformation on damage nucleation at grain boundaries in single phase metals

Bieler, T. R.; Eisenlohr, Philip; Roters, Franz; Kumar, Dharmesh; Mason, D. E.; Crimp, M. A.; Raabe, Dierk

doi:10.1016/j.ijplas.2008.09.002

Cited by 332 publications

(130 citation statements)

References 149 publications

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“…The microscopic factors usually involve slip with the associated dislocation, texture and grain shape, in the context of continuum mechanics. However, it is also argued [17] whether these crack initiation indicators would lead to a fatal flaw. By comparing the crack initiation experimental results by DIC and FE simulation results by crystal plasticity, Cheong et al [16] also pointed out that high energy sites are not necessarily the crack initiation sites; however, crack initiation sites must have high energy.…”

Section: Introductionmentioning

confidence: 99%

Material characterisation and finite element modelling of cyclic plasticity behaviour for 304 stainless steel using a crystal plasticity model

Sun

Becker

2016

International Journal of Mechanical Sciences

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract: Low cycle fatigue tests were carried out for a 304 stainless steel at room temperature. A series of experimental characterisations, including SEM, TEM, and XRD were conducted on for the 304 stainless steel to facilitate the understanding of the mechanical responses and microstructural behaviour of the material under cyclic loading including nanostructure, crystal structure and the fractured surface. The crystal plasticity finite element method (CPFEM) is a powerful tool for studying the microstructure influence on the cyclic plasticity behaviour. This method was incorporated into the commercially available software ABAQUS by coding a UMAT user subroutine. Based on the results of fatigue tests and material characterisation, the full set of material constants for the crystal plasticity model was determined. The CPFEM framework used in this paper can be used to predict the crack initiation sites based on the local accumulated plastic deformation and local plastic dissipation energy criterion, but with limitation in predicting the crack initiation caused by precipitates.

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Section: Introductionmentioning

confidence: 99%

Material characterisation and finite element modelling of cyclic plasticity behaviour for 304 stainless steel using a crystal plasticity model

Sun

Becker

2016

International Journal of Mechanical Sciences

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“…The pile-up of dislocations against grain boundaries could lead to localised high intensity stress concentrations, especially in planar slip materials. The forward stress generated by slip band/grain boundary interaction is cited to lead to slip transfer [2], deformation twin nucleation [3,4], cavity nucleation [5], fatigue crack nucleation [6], and some other phenomena [7,8].…”

Section: Introductionmentioning

confidence: 99%

Slip band–grain boundary interactions in commercial-purity titanium

2014

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“…Furthermore, cracks can sometimes nucleate at twin-twin or twingrain boundary intersections because of local shear incompatibility. [18][19][20][21] There is not a single computational model that can comprehensively describe twinning in hexagonal metals that include their nucleation, growth, interaction with matrix dislocations, other twins, and grain boundaries. To achieve this aim, more experimental characterization is needed to identify active mechanisms.…”

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confidence: 99%

Study of $$ \{ 11\bar{2} 1\} $$ Twinning in α-Ti by EBSD and Laue Microdiffraction

Wang

Barabash

Bieler

et al. 2013

Metall Mater Trans A

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Activity of the f11 " 21gh " 1 " 126i extension twinning (T2) mode was analyzed in a commercial purity Ti sample after 2 pct tensile strain imposed by four-point bending. The sample had a moderate c-axis fiber texture parallel to the tensile axis. Compared with the many f10 " 12gh " 1011i extension (T1) twins that formed in 6 pct of the grains, T2 twins were identified in 0.25 pct of the grains by scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) maps. Most of the T2 twins exhibited irregular twin boundaries (TBs) on one side of the twin. Highresolution EBSD revealed both intermediate orientations at some matrix/twin interfaces and substantial lattice rotation within some T2 twins. Interactions between matrix hc + ai dislocations 1 3 h1 " 213i and a f11 " 21g T2 twin were investigated by combining SEM/EBSD slip trace characterization and Laue microdiffraction peak streak analysis. hc + ai dislocations that originally glided on a pyramidal plane in the matrix were found on other planes in both the matrix and the twin, which was attributed to extensive cross-slip of the screw component, whose Burgers vector was parallel to the twinning plane. On the other hand, thickening of the twin could engulf some pile-up edge components in front of the TB. During this process, these hc + ai dislocations transmuted from a pyramidal plane ð0 " 111Þ in the matrix to a prismatic plane ð " 1010Þ T in the twin lattice. Finally, possible mechanisms for the nucleation and growth of T2 twins will be discussed.

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The role of heterogeneous deformation on damage nucleation at grain boundaries in single phase metals

Cited by 332 publications

References 149 publications

Material characterisation and finite element modelling of cyclic plasticity behaviour for 304 stainless steel using a crystal plasticity model

Material characterisation and finite element modelling of cyclic plasticity behaviour for 304 stainless steel using a crystal plasticity model

Slip band–grain boundary interactions in commercial-purity titanium

Study of $$ \{ 11\bar{2} 1\} $$ Twinning in α-Ti by EBSD and Laue Microdiffraction

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