Crystal plasticity based finite element modelling of large strain deformation in AM30 magnesium alloy

Izadbakhsh, Adel; Inal, Kaan; Mishra, Raja K.

doi:10.1088/0965-0393/20/3/035016

Cited by 19 publications

(7 citation statements)

References 51 publications

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“…A remarkable part of recent developments in this field has been focused on materials that pose challenges both in modelling and processing, such as hcp alloys, e.g. Segurado et al (2012); Izadbakhsh et al (2012); Knezevic et al (2013); Galán et al (2014). This kind of multiscale computations is computationally very intensive.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

An evolving plane stress yield criterion based on crystal plasticity virtual experiments

Gawąd

Banabic

Bael

et al. 2015

International Journal of Plasticity

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This paper presents a new hierarchical multi-scale framework that allows taking into account evolution of the plastic anisotropy during sheet forming processes. The evolution of crystallographic texture, which is identified as the main source of the plastic anisotropy, is predicted by the ALAMEL crystal plasticity model. An extension to the phenomenological anisotropic planestress yield criterion BBC2008 is proposed, which provides adaptive updates of the local anisotropy in the integration points of the macroscopic finite element model. To this end, the BBC2008 is systematically recalibrated to data provided by the crystal plasticity virtual experiment framework (VEF). An enhanced identification algorithm is proposed. The new algorithm exploits comprehensive material characterization delivered by the VEF.The deep drawing of cylindrical cups is used as a benchmark case. An industrial-grade aluminum alloy AA6016 is chosen for the test case. The experimental part of the study includes X-ray diffraction measurements of the texture as well as mechanical testing, which comprises uniaxial tensile tests, a bulge test and the deep drawing of cylindrical cups. A noticeable throughthickness gradient in terms of both the texture and the plastic anisotropy is identified in the initial material. This issue is taken into consideration in the

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

An evolving plane stress yield criterion based on crystal plasticity virtual experiments

Gawąd

Banabic

Bael

et al. 2015

International Journal of Plasticity

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“…Rate‐dependent regularization has been employed by most authors to avoid having to deal with linearly dependent slip systems . In rate‐dependent formulation, all systems can activate, and slips can be determined according to the viscosity of the material .…”

Section: Crystal Plasticitymentioning

confidence: 99%

On the pore-scale mechanisms leading to brittle and ductile deformation behavior of crystalline rocks

Tjioe

Borja

2015

Int. J. Numer. Anal. Meth. Geomech.

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SUMMARYDeformation mechanisms at the pore scale are responsible for producing large strains in porous rocks. They include cataclastic flow, dislocation creep, dynamic recrystallization, diffusive mass transfer, and grain boundary sliding, among others. In this paper, we focus on two dominant pore-scale mechanisms resulting from purely mechanical, isothermal loading: crystal plasticity and microfracturing. We examine the contributions of each mechanism to the overall behavior at a scale larger than the grains but smaller than the specimen, which is commonly referred to as the mesoscale. Crystal plasticity is assumed to occur as dislocations along the many crystallographic slip planes, whereas microfracturing entails slip and frictional sliding on microcracks. It is observed that under combined shear and tensile loading, microfracturing generates a softer response compared with crystal plasticity alone, which is attributed to slip weakening where the shear stress drops to a residual level determined by the frictional strength. For compressive loading, however, microfracturing produces a stiffer response than crystal plasticity because of the presence of frictional resistance on the slip surface. Behaviors under tensile, compressive, and shear loading invariably show that porosity plays a critical role in the initiation of the deformation mechanisms. Both crystal plasticity and microfracturing are observed to initiate at the peripheries of the pores, consistent with results of experimental studies.

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“…Since plastic flow inhomogeneities are intricately dependent on the morphological and crystallographic characteristics of the microstructure, it is important to develop imagebased micro-mechanical models of deformation and twinning. Crystal plasticity finite element (CPFE) models have been implemented to model deformation and twinning in Mg in (Staroselsky and Anand, 2003a;Graff et al, 2007;Izadbakhsh et al, 2011Izadbakhsh et al, , 2012Zhang and Joshi, 2012;Abdolvand and Daymond, 2013a). Most of the twinning models for CPFE simulations adopt a volume-fraction based approach to represent twinning in the microstructure.…”

Section: Introductionmentioning

confidence: 99%

Crystal plasticity finite element modeling of discrete twin evolution in polycrystalline magnesium

Cheng¹,

Ghosh

2017

Journal of the Mechanics and Physics of Solids

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This paper develops an advanced, image-based crystal plasticity finite element (CPFE) model, for predicting explicit twin formation and associated heterogeneous deformation in single crystal and polycrystalline microstructures of hexagonal close-packed or hcp materials, such as magnesium. Twin formation is responsible for premature failure of many hcp materials. The physics of nucleation, propagation and growth of explicit twins are considered in the CPFE formulation. The twin nucleation model is based on dissociation of sessile dislocations into stable twin loops, while propagation is assumed by atoms shearing on twin planes and shuffling to reduce the thermal activation energy barrier. The explicit twin evolution model however has intrinsic issues of low computational efficiency. Very fine simulation time steps with enormous computation costs are required to simulate the fast propagating twin bands and associated strain localization. To improve the computational efficiency, a multi-time scale subcycling algorithm is developed. It decomposes the computational domain into sub-domains of localized twins requiring very fine timesteps and complementary domains of relatively low resolution. Each sub-domain updates the stress and the deformation-dependent variables in different rates, followed by a coupling at the end of every coarse time step to satisfy global equilibrium. A 6-fold increase in computing speed is obtained for a polycrystalline Mg microstructure simulation in this paper. CPFE simulations of high purity Mg microstructures are compared with experiments with very good agreement in stress-strain response as well as heterogeneous twin formation with strain localization.

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Crystal plasticity based finite element modelling of large strain deformation in AM30 magnesium alloy

Cited by 19 publications

References 51 publications

An evolving plane stress yield criterion based on crystal plasticity virtual experiments

An evolving plane stress yield criterion based on crystal plasticity virtual experiments

On the pore-scale mechanisms leading to brittle and ductile deformation behavior of crystalline rocks

Crystal plasticity finite element modeling of discrete twin evolution in polycrystalline magnesium

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