Inter-granular residual stresses in polycrystalline aggregates: finite element modelling and diffraction post-processing
Most models based on continuum mechanics do not account for inhomogeneities at the micro-scale. This can be achieved by considering a representative volume of material and using poly(crystal) elasto-plastic deformation theory to model the effects of grain morphology and crystallographic orientation....
| Egile Nagusiak: | , , , |
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| Formatua: | Journal article |
| Hizkuntza: | English |
| Argitaratua: |
Trans Tech Publications
2008
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| Gaiak: |
| _version_ | 1826279255027220480 |
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| author | Song, X Zhang, S Dini, D Korsunsky, A |
| author_facet | Song, X Zhang, S Dini, D Korsunsky, A |
| author_sort | Song, X |
| collection | OXFORD |
| description | Most models based on continuum mechanics do not account for inhomogeneities at the micro-scale. This can be achieved by considering a representative volume of material and using poly(crystal) elasto-plastic deformation theory to model the effects of grain morphology and crystallographic orientation. In this way, the relationshhip between the macroscopic stress state and the stress state at the grain level can be investigated in detail. In addition, this approach enables the determination of the inhomogeneous fields of plastic strain, the identification of regions of localised plasticity (persistent slip bands), grain level shakedown, and the prediction of fatigue crack initiation using energy dissipation at the micro-scale. Elastic anisotropy is known to promote earlier onset of yielding, and to increase the magnitude of intergranualr residual stresses. The effect of hardening behaviour of different slip systems on intergranular residual stresses is more subtle, as discussed in the text. The present study focuses on the analysis <em>average intergranular residual strains and stresses</em> that arise within the polycrystal aggregate following the application of single or cyclic external loading. These residual strains can also be evaluated experimentally using diffraction of penetrating radiation, e.g. neutrons or high energy X-rays, allowing comparisons with the model predictions to be made. |
| first_indexed | 2024-03-06T23:56:01Z |
| format | Journal article |
| id | oxford-uuid:74413231-73d8-4c68-b272-53e561d9ab81 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:56:01Z |
| publishDate | 2008 |
| publisher | Trans Tech Publications |
| record_format | dspace |
| spelling | oxford-uuid:74413231-73d8-4c68-b272-53e561d9ab812022-03-26T20:01:30ZInter-granular residual stresses in polycrystalline aggregates: finite element modelling and diffraction post-processingJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:74413231-73d8-4c68-b272-53e561d9ab81Engineering & allied sciencesEnglishOxford University Research Archive - ValetTrans Tech Publications2008Song, XZhang, SDini, DKorsunsky, AMost models based on continuum mechanics do not account for inhomogeneities at the micro-scale. This can be achieved by considering a representative volume of material and using poly(crystal) elasto-plastic deformation theory to model the effects of grain morphology and crystallographic orientation. In this way, the relationshhip between the macroscopic stress state and the stress state at the grain level can be investigated in detail. In addition, this approach enables the determination of the inhomogeneous fields of plastic strain, the identification of regions of localised plasticity (persistent slip bands), grain level shakedown, and the prediction of fatigue crack initiation using energy dissipation at the micro-scale. Elastic anisotropy is known to promote earlier onset of yielding, and to increase the magnitude of intergranualr residual stresses. The effect of hardening behaviour of different slip systems on intergranular residual stresses is more subtle, as discussed in the text. The present study focuses on the analysis <em>average intergranular residual strains and stresses</em> that arise within the polycrystal aggregate following the application of single or cyclic external loading. These residual strains can also be evaluated experimentally using diffraction of penetrating radiation, e.g. neutrons or high energy X-rays, allowing comparisons with the model predictions to be made. |
| spellingShingle | Engineering & allied sciences Song, X Zhang, S Dini, D Korsunsky, A Inter-granular residual stresses in polycrystalline aggregates: finite element modelling and diffraction post-processing |
| title | Inter-granular residual stresses in polycrystalline aggregates: finite element modelling and diffraction post-processing |
| title_full | Inter-granular residual stresses in polycrystalline aggregates: finite element modelling and diffraction post-processing |
| title_fullStr | Inter-granular residual stresses in polycrystalline aggregates: finite element modelling and diffraction post-processing |
| title_full_unstemmed | Inter-granular residual stresses in polycrystalline aggregates: finite element modelling and diffraction post-processing |
| title_short | Inter-granular residual stresses in polycrystalline aggregates: finite element modelling and diffraction post-processing |
| title_sort | inter granular residual stresses in polycrystalline aggregates finite element modelling and diffraction post processing |
| topic | Engineering & allied sciences |
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