A crystallographic mechanism for fatigue crack propagation through grain boundaries

Zhai, Tianrui; Wilkinson, Angus J.; Martin, J. W.

doi:10.1016/s1359-6454(00)00214-7

Cited by 386 publications

(193 citation statements)

References 17 publications

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“…Studies of fatigue of polycrystalline alloys at grain level indicated that crack nucleation and subsequent transgranular growth tend to follow the slip planes due to the shear deformation associated with the slip systems [e.g., 27,30,35,53]. Along the same line, here it was proposed that crack growth in the grain interior will follow the direction of slip trace with the maximum accumulated slip, which can be computed from the crack-tip deformation analyses.…”

Section: Prediction Of Crack Growth Pathmentioning

confidence: 88%

“…As the material has a fine grain micro-structure, it seems plausible to assume that crack will grow along the slip trace without changing to another direction within the gain. Also, for polycrystalline material, experiment observations show that crack growth tend to follow the slip plane in each grain and a change of crack growth behaviour mostly happens when crossing the grain boundaries due to the change of favourable slip planes [27,30].…”

Section: Prediction Of Crack Growth Pathmentioning

confidence: 99%

“…However, experimental evidence regarding the connection between crack growth path and slip planes (e.g., {111}, {100}, {110}) in f.c.c. materials has been well documented [27,53,56,57]. In this work, crack growth trajectories were explored based on the consideration of the maximum amount of accumulated shear deformation on the available slip planes.…”

Section: Crack-tip Deformationmentioning

confidence: 99%

“…Crack initiation phase can be divided into micro-structurally short crack initiation and subsequent micro-structurally short crack propagation, both of which are strongly influenced by local micro-structural features, such as crystallographic orientations, inclusions, voids, grain boundaries and material phases [23][24][25]. For crack propagation phase, different size and crystallographic orientation of the grains may also increase, decrease or arrest the crack growth [26][27][28][29]. Also, grain orientation mismatch leads to the change of slip plane across the grain boundaries [30], resulting in a zig-zag pattern for crack growth [31].…”

Section: Introductionmentioning

confidence: 99%

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A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Lin

Tong

2011

Engineering Fracture Mechanics

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Crystal plasticity has been applied to model the cyclic constitutive behaviour of a polycrystalline nickel-based superalloy at elevated temperature using finite element analyses.A representative volume element, consisting of randomly oriented grains, was considered for the finite element analyses under periodic boundary constraints. Strain-controlled cyclic test data at 650°C were used to determine the model parameters from a fitting process, where three loading rates were considered. Model simulations are in good agreement with the experimental results for stress-strain loops, cyclic hardening behaviour and stress relaxation behaviour. Stress and strain distributions within the representative volume element are of heterogeneous nature due to the orientation mismatch between neighboring grains. Stress concentrations tend to occur within "hard" grains while strain concentrations tend to locate within "soft" grains, depending on the orientation of grains with respect to the loading direction. The model was further applied to study the near-tip deformation of a transgranular crack in a compact tension specimen using a submodelling technique. Grain microstructure is shown to have an influence on the von Mises stress distribution near the crack tip, and the gain texture heterogeneity disturbs the well-known butterfly shape obtained from the viscoplasticity analysis at continuum level. The stress-strain response near the crack tip, as well as the accumulated shear deformation along slip system, is influenced by the orientation of the grain at the crack tip, which might dictate the subsequent crack growth through grains.Individual slip systems near the crack tip tend to have different amounts of accumulated shear deformation, which was utilised as a criterion to predict the crack growth path.

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Section: Prediction Of Crack Growth Pathmentioning

confidence: 88%

Section: Prediction Of Crack Growth Pathmentioning

confidence: 99%

Section: Crack-tip Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Lin

Tong

2011

Engineering Fracture Mechanics

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“…That is, the interested region can be approximately seem as being deformed under uniaxial compressive stress during the bending process. Therefore, Schmid factor analysis is a common method in grain strain capacity under uniaxial compressive stress [9,20,21]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Study of Strain characterization and microstructure evolution under compression stress in Al-Li alloy

Jin¹,

Zhang²,

Xue³

et al. 2018

Proceedings of the 2017 4th International Conference on Machinery, Materials and Computer (MACMC 2017)

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Abstract:The strain variation and microstructure evolution of 2060-T8 alloy during bending are investigated by Micro-hardness point method (MHPM) and Digital Image Correlation (DIC), electron backscattered diffraction (EBSD). Experimental result shows DIC method can be used to characterize the strain micro-region on average and it can also represent the local strain tensor in the micro-region compared to the traditional MHPM. The strain is unevenly distributed in grains due to the mis-orientation between the adjacent grains difference, the mis-orientation has a blocking effect on the slip of dislocations during deformation in polycrystalline sample. The result shows the mis-orientation between adjacent grains is smaller with larger strain, while the mis-orientation between adjacent grains is larger with smaller strain. The degree of grain division in the process of deformation is related to the strain in this region, a new microstructure such as band structure is observed in grains with larger strain.

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Meso/Micro Fatigue Crack Growth Involving Crystal Structure and Crack Geometry: The Effect of Crystal Structure, Crack Geometry, Stress Ratio and Component Scale

Rodopoulos

Chliveros

2007

Particle and Continuum Aspects of Mesomechanics

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A crystallographic mechanism for fatigue crack propagation through grain boundaries

Cited by 386 publications

References 17 publications

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Study of Strain characterization and microstructure evolution under compression stress in Al-Li alloy

Meso/Micro Fatigue Crack Growth Involving Crystal Structure and Crack Geometry: The Effect of Crystal Structure, Crack Geometry, Stress Ratio and Component Scale

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