Strain localization and failure in irradiated zircaloy with crystal plasticity

Erinosho, Tomiwa; Dunne, Fionn P.E.

doi:10.1016/j.ijplas.2015.05.008

Cited by 56 publications

(15 citation statements)

References 26 publications

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“…By constraining dislocation-mediated plasticity to specific slip directions, consistent with the crystallographic geometry of the material, CPFE renders a physical basis to predictions and makes them directly comparable to experimental observations [94][95][96]. Also important qualitative insight into the interaction mechanism between defects/precipitates and dislocations, such as irradiation-softening [97] or crack nucleation [98] can be obtained from such simulations. These models can be further enhanced by explicitly accounting for the dynamics of interaction between the population of radiation defects and gliding dislocations and the resultant evolution of the material microstructure and density of mobile or immobile dislocations [91,99,100].…”

Section: Techniques To Study Irradiated Materialsmentioning

confidence: 99%

Recent advances in characterising irradiation damage in tungsten for fusion power

Das

2019

SN Appl. Sci.

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Tungsten is the front-runner candidate for building the plasma-facing armour components for future fusion reactors. However, in-service irradiation by fusion-neutrons and helium will create lattice-defects in the material, compromising its properties and lifetime. Improving the component's resilience to radiation damage and accurately predicting the lifetime of irradiated components is key for commercial feasibility of the reactor. For this purpose, understanding the creation and evolution of radiation damage is essential. This paper reviews recent advances in characterising radiation damage through experimental and modelling techniques. Tungsten-ion-and helium-ion-implantation are commonly used to mimic the damage created by neutron-and helium-irradiation respectively. Defects (> 1.5 nm) can be directly imaged using transmission electron microscopy while all defects (size-independent), may be indirectly probed by measuring lattice strains induced by them (using diffraction techniques; synchrotron X-rays or high-resolution electron-backscatter). Neutron-irradiation produces mainly ½〈111〉 prismatic loops. Loop-interaction and structural organisation evolves with changing implantation dose and temperature. Helium-irradiation, < 573 K, induces formation of small helium-vacancy clusters, which evolve into bubbles, blisters and "fuzz" structure with changing temperature and dose. Nano-indentation or micro-cantilever bending tests can be used to examine mechanical properties of ion-implanted layers. Both heliumand neutron-implantation defects induce increased hardening often followed by subsequent strain-softening and localised deformation. Such irradiation-induced alterations are detrimental to material ductility and long-term structural integrity of tungsten-based components. Development of physically-based material models that capture the physics of underlying irradiation-induced changes, inspire confidence of reliably using simulations to predict mechanical behaviour and in-service performance of irradiated engineering components in future.

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Section: Techniques To Study Irradiated Materialsmentioning

confidence: 99%

Recent advances in characterising irradiation damage in tungsten for fusion power

Das

2019

SN Appl. Sci.

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“…As a result, they induce the formation of very intense SBs, promoting failure and reducing metals ductility. This concern has motivated numerous modeling efforts, relying on dislocation-based softening classical crystal plasticity (CCP) models to simulate such plastic slip localization (Zhang et al, 2010;Barton et al, 2013;Patra and McDowell, 2016;Xiao et al, 2015;Erinosho and Dunne, 2015;Hure et al, 2016). These models effectively lead to the formation of SBs and KBs within polycrystalline simulations.…”

Section: Introductionmentioning

confidence: 99%

FFT-based simulations of slip and kink bands formation in 3D polycrystals: Influence of strain gradient crystal plasticity

Marano

Gélebart

Forest

2021

Journal of the Mechanics and Physics of Solids

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The ability of softening strain gradient plasticity to simulate intragranular plastic slip localization modes called slip and kink bands, at is investigated at incipient plasticity. A strain gradient crystal plasticity model based on a quadratic energy contribution of the Nye tensor has been implemented within the massively parallel FFT-based solver AMITEX FFTP. It is shown that a classical evaluation of the double curl operator does not properly account for the backstress induced by GNDs in slip and kink bands. Consequently, a better suited differentiation operator is proposed for this purpose. Besides, four practical implementations of interface conditions at grain boundaries are implemented and discussed. It is demonstrated that these conditions have a strong influence on GND induced hardening but weakly affect the formation of slip localization patterns.A theoretical and numerical study of an idealized kink band shows that this modeling framework, contrary to classical crystal plasticity models, is able to capture their essential physical features. A quantitative analysis of high resolution 3D polycrystalline simulations, based on imaged processing and a peak detection on plastic slip profiles, is applied to show that gradient effects strongly influence the mechanisms of selection between slip and kink banding, to the favor of the first. In particular, some kink bands are shown to decompose into an homogeneous distribution of parallel slip bands of finite length. Finally, the competition between structural effects and energetic cost of lattice curvature in the formation of localized slip bands networks in polycrystals is discussed. The present results demonstrate the relevance of softening crystal plasticity modeling including an energetic contribution of GND density to accurately capture slip localization in polycrystals.

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“…Extensive studies have been devoted to simulate slip localization in crystals (Dao and Asaro (1996a,b); Sluys and Estrin (2000)). In the case of irradiated metals, models based on softening classical crystal plasticity (CCP) have been developed McDowell (2012, 2016); Barton et al (2013); Xiao et al (2015); Erinosho and Dunne (2015); Hure et al (2016)) to conduct full-field simulations of strain localization. If intense localization bands are successfully captured, these models fail to reproduce realistic slip bands networks.…”

Section: Introductionmentioning

confidence: 99%

Non-linear composite voxels for FFT-based explicit modeling of slip bands: Application to basal channeling in irradiated Zr alloys

Marano

Gélebart

2020

International Journal of Solids and Structures

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Explicitly modeling slip bands is a promising method to simulate the consequences of intragranular plastic slip localization on the behavior of strongly localizing crystals such as irradiated metals. In this study, we propose a very efficient framework to implement this modeling strategy based on a massively parallel FFT-based solver enhanced with composite voxels to simulate polycrystals with a regular lamellar structure alternating plastic slip bands embedded within larger elastic bands. To this end, generic composite voxel models have been formulated and implemented, allowing to extend the approach to any type of constitutive behavior in the future. In particular, we show that laminate composite voxels are particularly well suited to improve standard FFT-based solvers in this context, and enable to run polycrystalline simulations accurately accounting for slip bands whose width is two orders of magnitude below the grain size. To demonstrate the potential of this approach, we apply it to an idealized material designed to approximate basal channeling in irradiated textured Zr alloys. Varying the width and the spacing of the modeled slip bands, we show that it allows to capture the increase of grain boundary normal stress concentrations or the enhanced Bauschinger effect induced by an increased localization of plastic slip.

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Strain localization and failure in irradiated zircaloy with crystal plasticity

Cited by 56 publications

References 26 publications

Recent advances in characterising irradiation damage in tungsten for fusion power

Recent advances in characterising irradiation damage in tungsten for fusion power

FFT-based simulations of slip and kink bands formation in 3D polycrystals: Influence of strain gradient crystal plasticity

Non-linear composite voxels for FFT-based explicit modeling of slip bands: Application to basal channeling in irradiated Zr alloys

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