Lengthscale-dependent, elastically anisotropic, physically-based hcp crystal plasticity: Application to cold-dwell fatigue in Ti alloys

Dunne, Fionn P.E.; Rugg, David; Walker, Adrian

doi:10.1016/j.ijplas.2006.10.013

Cited by 430 publications

(303 citation statements)

References 39 publications

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“…Further, it was shown that the hard/soft grain interaction sites could be found at the corners of a facet that had formed via the nucleation and coalescence of voids, as shown by the circles in figure 6d. This closely mirrors the results of Dunne et al [82,83] and Rugg et al [84] under fatigue loading conditions, where it was shown that facets nucleate at boundaries between plastically hard and soft α grains. This failure mechanism is yet to be probed in other HCP metals.…”

Section: (B) Spall Response Of Titaniumsupporting

confidence: 90%

The shock and spall response of three industrially important hexagonal close-packed metals: magnesium, titanium and zirconium

Hazell

Appleby-Thomas

Wielewski

et al. 2014

Phil. Trans. R. Soc. A.

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Magnesium, titanium and zirconium and their alloys are extensively used in industrial and military applications where they would be subjected to extreme environments of high stress and strain-rate loading. Their hexagonal close-packed (HCP) crystal lattice structures present interesting challenges for optimizing their mechanical response under such loading conditions. In this paper, we review how these materials respond to shock loading via plate-impact experiments. We also discuss the relationship between a heterogeneous and anisotropic microstructure, typical of HCP materials, and the directional dependency of the elastic limit and, in some cases, the strength prior to failure.

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Section: (B) Spall Response Of Titaniumsupporting

confidence: 90%

The shock and spall response of three industrially important hexagonal close-packed metals: magnesium, titanium and zirconium

Hazell

Appleby-Thomas

Wielewski

et al. 2014

Phil. Trans. R. Soc. A.

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“…grain interactions, FE modelling strategies have been developed, where the morphology of the polycrystalline material is represented by a two or three dimensional representative volume element (RVE) with individual grains explicitly modelled essentially within this RVE (see, e.g., Barbe et al, 2001;Delannary et al, 2006;Dunne et al, 2007;Nakamachi et al, 2007). The deformation of individual grains is then typically represented by crystal plasticity theory, based on Schmid's law.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…To date, self-consistent models have generally been preferred as a technique to predict the lattice strain evolution for comparison with in-situ ND measurements, as FE micromechanical modelling is less computationally efficient, particularly, when modelling a large number of grains within the RVE (e.g., Barbe et al, 2001;Delannary et al, 2006;Dunne et al, 2007;Nakamachi et al, 2007). However, with the development of modern computing technologies (high performance architectures and algorithms), nonlinear FE modelling of a sufficient number of grains has become more practicable.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Microscale prediction of deformation in an austenitic stainless steel under uniaxial loading

O’Dowd

Davies

et al. 2011

European Journal of Mechanics - A/Solids

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“…A user defined element (UEL) was developed in order to determine the plastic strain gradients, as described elsewhere by Dunne et al (2007), and a detailed description of the large deformation formulation may be found in Liang (2008). The Berkovich indenter and the single-crystal titanium sample are shown schematically in figure 1.…”

Section: Simulating Crystal Plasticity During Indentation In Ti Alloysmentioning

confidence: 99%

The effect of crystal orientation on the indentation response of commercially pure titanium: experiments and simulations

2009

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This study combines nanoindentation, electron backscatter diffraction (EBSD) and crystal plasticity finite element analysis to examine the anisotropy in the indentation behaviour of individual grains within an α-Ti polycrystal. Nanoindentation is utilized to mechanically probe small volumes of material within grains for which orientations are known from prior EBSD mapping. Both indentation modulus and hardness decrease significantly as the indentation axis is inclined further from the c-axis; the plastic response showing the more marked anisotropy. Recently developed high angular resolution EBSD has been utilized to examine selected indents, providing maps of elastic strain variations and lattice rotations. From such maps lower bound solutions for the density of geometrically necessary dislocations (GNDs) have been established. Crystal plasticity modelling showed promise in capturing correctly the orientation dependence of load-displacement response and in lattice rotations local to the indenter, particularly for indentation into a basal plane which generated threefold rotational symmetry about an axis parallel with the indentation direction which was also observed in experiments.

show abstract

Lengthscale-dependent, elastically anisotropic, physically-based hcp crystal plasticity: Application to cold-dwell fatigue in Ti alloys

Cited by 430 publications

References 39 publications

The shock and spall response of three industrially important hexagonal close-packed metals: magnesium, titanium and zirconium

The shock and spall response of three industrially important hexagonal close-packed metals: magnesium, titanium and zirconium

Microscale prediction of deformation in an austenitic stainless steel under uniaxial loading

The effect of crystal orientation on the indentation response of commercially pure titanium: experiments and simulations

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