Microstructure-based crystal plasticity modeling of cyclic deformation of Ti–6Al–4V

Zhang, M.; Zhang, J.; McDowell, David L.

doi:10.1016/j.ijplas.2006.11.009

Cited by 196 publications

(72 citation statements)

References 29 publications

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“…A review of literature shows that the physically-based crystal plasticity theory has been generally used to describe the mechanical behaviour of materials at grain level. With the assistance of the finite element (FE) method, the theory is able to predict the global and local stress-strain response [10][11][12][13][14][15], the evolution of crystallographic grain texture [10,16] and micro-structural crack nucleation [17][18][19] in polycrystalline materials under monotonic, creep and fatigue loading conditions. Recently, application of the theory has also been extended to polycrystalline nickel superalloy, where material microstructure was considered as one of the major factors influencing the fatigue and creep properties of the material.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…The physically-based crystal plasticity theory has been successful for description of anisotropic deformation of single crystals and polycrystals, including body-centered-cubic [1,2], face-centered-cubic [3,4] and highly-closed-packed [5,6] lattice structures. With the assistance of finite element method, the theory is able to predict the global and local stress-strain response [1][2][3][5][6][7], the evolution of crystallographic grain texture [1,4] and micro-structural crack nucleation [8][9][10] in polycrystalline materials under monotonic, creep and fatigue loading conditions. The essence of the crystal plasticity is to resolve the macroscopic stresses onto each slip system following the Schmid's law, where the shear strain rate can be expressed as a function of the resolved shear stress [11].…”

Section: Introductionmentioning

confidence: 99%

Crystal plasticity modeling of cyclic deformation for a polycrystalline nickel-based superalloy at high temperature

Lin

Tong

et al. 2010

Materials Science and Engineering: A

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“…As developed by Zhang et al [22], the drag stress is taken as a non-evolving constant, while the back stress evolves according to an Armstrong-Frederick direct hardening/dynamic recovery type of equation, i.e.,…”

Section: Materials Systemsmentioning

confidence: 99%

“…The crystal plasticity constitutive model was coded into ABAQUS 2006 UMAT, based on previous work by Zhang et al [22]; Mayeur and McDowell, 2007 [19]. For textured Ti-6Al-4V alloy, some of the material parameters in the crystal plasticity are obtained from Bridier et al [23].…”

Section: Simulation Of Notched Componentsmentioning

confidence: 99%

Application of Weakest Link Probabilistic Framework for Fatigue Notch Factor to Turbine Engine Materials

Okeyoyin¹,

Owolabi²

2013

WJM

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This paper is concerned with the extension of a recently developed probabilistic framework based on Weibull's weakest link and extreme-value statistics to aero-engine materials like titanium alloy and nickel-base super alloys using simulation strategies that capture both the essence of notch root stress gradient and the complexity of realistic microstructures. In this paper, notch size effects and notch root inelastic behavior are combined with probability distributions of microscale stress-strain gradient and small crack initiation to inform minimum life design methods. A new approach which can be applied using crystal plasticity finite element or closed-form solution is also proposed as a more robust approach for determining fatigue notch factor than the existing classical methods. The fatigue notch factors predicted using the new framework are in good agreements with experimental results obtained from literature for notched titanium alloy specimens subjected to uniaxial cyclic loads with various stress ratio.

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Microstructure-based crystal plasticity modeling of cyclic deformation of Ti–6Al–4V

Cited by 196 publications

References 29 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

Crystal plasticity modeling of cyclic deformation for a polycrystalline nickel-based superalloy at high temperature

Application of Weakest Link Probabilistic Framework for Fatigue Notch Factor to Turbine Engine Materials

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