Simulation of crystal plasticity in irradiated metals: A case study on Zircaloy-4

Hardie, Chris; Thomas, Rhys; Liu, Yang; Frankel, Philipp; Dunne, Fionn P.E.

doi:10.1016/j.actamat.2022.118361

Cited by 17 publications

(10 citation statements)

References 43 publications

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“…Macaulay brackets are applied to the stress terms which indicate that the slip rate is zero when the applied shear stress is lower than the critical value. Full details of the CPFE framework, including the relevant material constants were previously reported [18].…”

Section: Methodsmentioning

confidence: 99%

“…To capture both hardening and softening effects due to irradiation damage in Zircaloy-4, Hardie et al [18] developed a mechanistic CPFE-dislocation-based model. Central to this is the incorporation of an irradiation hardening term (a function of dislocation loop density) within the classical Taylor model.…”

Section: Methodsmentioning

confidence: 99%

“…Central to this is the incorporation of an irradiation hardening term (a function of dislocation loop density) within the classical Taylor model. Here, a modified isotropic linear hardening (ISO-LH) model [18] is incorporated, whereby the dislocation loop density is treated as equivalent to other dislocation types. The CRSS is then given by equation (2),…”

Section: Methodsmentioning

confidence: 99%

“…the softening behaviour is controlled by the annihilation of dislocation loops. The annihilation rate (due to slip) of total ⟨a⟩ loop density is given in differential form in equation (3) [18],…”

Section: Methodsmentioning

confidence: 99%

“…Hence, a fully coupled model requires fundamental understanding to describe the evolution of dislocation loop density with respect to plastic strain, irradiation dose, and temperature. Recent CPFE modelling advances [15][16][17][18], underpinned by in-situ high resolution digital image correlation [19], have offered improved mechanistic understanding of microscale plastic deformation in irradiated materials. However, for investigation of synergistic irradiated loading, experiments reach a practical limit.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic coupling of thermomechanical loading and irradiation damage in Zircaloy-4

Long,

Liu,

Hardie

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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This work addresses in-situ synergistic irradiation and thermomechanical loading of nuclear reactor components by linking new mechanistic understanding with crystal plasticity finite element modelling to describe the formation and thermal and mechanical annihilation of dislocation loops. A model of pressurised reactor cladding is constructed to extract realistic boundary conditions for crystal plasticity microstructural sub-modelling. Thermomechanical loads are applied to the sub-model to investigate (i) the unirradiated state, (ii) synergistic coupling of irradiation damage and thermal annihilation of dislocation loops, (iii) synergistic coupling of irradiation damage without thermal annihilation of dislocation loops, and (iv) a post-irradiated state. Results demonstrate that the synergistic coupling of irradiation damage and thermomechanical loads leads to the early onset of plasticity, which is exacerbated by the thermal annihilation of dislocations, while the post-irradiated case remains predominantly elastic due to substantial irradiation hardening. It is shown that full synergistic coupling leads to localisation of quantities linked with crack nucleation including geometrically necessary dislocations and stress.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%