Integrated experiment and modelling of microstructurally-sensitive crack growth

Wan, V.V.C.; MacLachlan, D.W.; Dunne, Fionn P.E.

doi:10.1016/j.ijfatigue.2016.05.027

Cited by 19 publications

(5 citation statements)

References 49 publications

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“…Given that grain boundaries are often preferential locations for damage nucleation (Boehlert et al, 2012;Muñoz-Moreno et al, 2013) and that strain energy is often used as a metric to identify potential damage sites (e.g. Sangid et al, 2011;Musinki and McDowell, 2016;Wan et al 2016;Cruzado et al, 2018;Chen et al, 2018), the need to accurately predict localized deformation at and near grain boundaries seems quite important to understand and predict accurately the mechanical performance of polycrystals.…”

Section: Introductionmentioning

confidence: 99%

An analysis of (the lack of) slip transfer between near-cube oriented grains in pure Al

Bieler

Alizadeh

Peña-Ortega

et al. 2019

International Journal of Plasticity

103

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Slip transfer across grain boundaries was studied in annealed polycrystalline Al foils deformed in uniaxial tension by means of the analysis of the slip traces on the specimen surface. Grain orientations and selected grain boundary misorientations were measured on both surfaces of the sample using electron back-scattered diffraction mapping. It was found that most of the grains were within 15° of a cube orientation and approximately half of the grains percolated through the specimen thickness. The Luster-Morris " parameter (that can be computed from the surface grain orientation) was used to assess the likelihood of slip transfer across boundaries. It was found that transfer across grain boundaries was rare in near-cube oriented grains, and convincing evidence was only found when " > 0.97, which corresponds to lowangle boundaries with <15º misorientation. This behavior was explained by the presence of many active slip slips in near-cube oriented grains that favor self-accommodation of the grain shape to the evolving boundary conditions imposed by neighboring grains instead of promoting slip transfer across the boundary. These results indicate that the alignment between slip planes and slip directions across the boundary is not the only important metric to determine the threshold for slip transfer, as the particular details of deformation in each grain (such as the number of available slip systems) also must be considered.

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Section: Introductionmentioning

confidence: 99%

An analysis of (the lack of) slip transfer between near-cube oriented grains in pure Al

Bieler

Alizadeh

Peña-Ortega

et al. 2019

International Journal of Plasticity

103

View full text Add to dashboard Cite

show abstract

“…3 Energy-based FID 67 was proposed as a function of dislocation densities and crystal-level stress/ strain and its capability was demonstrated to identify crack nucleation sites in experimental observations of HCP and FCC polycrystals. 14,[68][69][70][71] Four of the well-established FIPs are incorporated into the crystal plasticity model described above to investigate the FIP predictions, compared with the proposed FIP (described below) and to compare with the crack nucleation data in experimental observations. Single-crystal experimental observations demonstrate that the accumulated plastic strain is a precursor to fatigue crack initiation, where the initiated crack lies inside the plane of the shear band.…”

Section: Established Fipsmentioning

confidence: 99%

“…Mixed‐mode crack nucleation FIP 66 was proposed to account for mixed shear and tensile stress in the hard grain and dislocation pile‐up length in the soft grain, which was later modified into a nonlocal scheme considering the Nye tensor and GND 3 . Energy‐based FID 67 was proposed as a function of dislocation densities and crystal‐level stress/strain and its capability was demonstrated to identify crack nucleation sites in experimental observations of HCP and FCC polycrystals 14,68–71 …”

Section: Fipsmentioning

confidence: 99%

A comparative study on fatigue indicator parameters for near‐α titanium alloys

Liu

Zhang

Oskay

2022

Fatigue Fract Eng Mat Struct

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Nucleation of in‐service cracks leads to detrimental consequences for structural components of near‐α titanium alloys subjected to fatigue loads. Experimental observations show that the fatigue initiation facets usually form in certain crystallographic orientation ranges of “hard” primary α grains which differ between pure and dwell fatigue loads. In this manuscript, a comparative study has been performed using several fatigue indicator parameters (FIPs) to assess their ability to predict the location of fatigue crack nucleation in near‐α titanium alloy microstructures. All selected FIPs are implemented within the same polycrystalline plasticity finite element modeling framework to facilitate one‐to‐one comparisons. Comparison on predictability of critical initiation locations and their crystallographic orientations is studied for incorporated FIPs under pure and dwell fatigue. The critical locations predicted by some FIPs were found to be close to each other, and consistent with the crystallographic orientation ranges from fractography measurements, in addition to the range transition from pure to dwell fatigue loads. Critical locations from slip driven FIPs are obtained to be several grains away from that of the former ones and are inclined to capture orientations of slip traces from experiments.

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“…This is particularly important in the case of low symmetry crystals, in which the limited availability of slip systems may led to large stress concentrations at the grain boundaries if slip transfer is hindered. Moreover, cracks are often nucleated at grain boundaries during fatigue and crack propagation across neighbour grains is critical to determine whether a microstructurally small crack will be arrested or propagate until failure (Musinski and McDowell, 2016;Wan et al, 2016a).…”

Section: Concluding Remarks and Future Developmentsmentioning

confidence: 99%

Computational Homogenization of Polycrystals

Segurado

Lebensohn

LLorca

2018

Advances in Applied Mechanics

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This paper reviews the current state-of-the-art in the simulation of the mechanical behavior of polycrystalline materials by means of computational homogenization. The key ingredients of this modelling strategy are presented in detail starting with the parameters needed to describe polycrystalline microstructures and the digital representation of such microstructures in a suitable format to perform computational homogenization. The different crystal plasticity frameworks that can describe the physical mechanisms of deformation in single crystals (dislocation slip and twinning) at the microscopic level are presented next. This is followed by the description of computational homogenization methods based on mean-field approximations by means of the viscoplastic self-consistent approach, or on the full-field simulation of the mechanical response of a representative polycrystalline volume element by means of the finite element method or the fast Fourier transform-based method. Multiscale frameworks based on the combination of mean-field homogenization and the finite element method are presented next to model the plastic deformation of polycrystalline specimens of arbitrary geometry under complex mechanical loading. Examples of application to predict the strength, fatigue life, damage, and texture evolution under different conditions are presented to illustrate the capabilities of the different models. Finally, current challenges and future research directions in this field are summarized.

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Integrated experiment and modelling of microstructurally-sensitive crack growth

Cited by 19 publications

References 49 publications

An analysis of (the lack of) slip transfer between near-cube oriented grains in pure Al

An analysis of (the lack of) slip transfer between near-cube oriented grains in pure Al

A comparative study on fatigue indicator parameters for near‐α titanium alloys

Computational Homogenization of Polycrystals

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