A critical discussion of the sin²ψ stress measurement technique
The sin²ψ technique for near-surface and bulk stress evaluation is frequently considered to be the method of reference, largely due to the historical reason of being established early on in the development of experimental study of residual stress, and due to the widespread availability of laboratory...
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| Format: | Journal article |
| Language: | English |
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Trans Tech Publications
2008
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| _version_ | 1797089795094085632 |
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| author | Korsunsky, A |
| author_facet | Korsunsky, A |
| author_sort | Korsunsky, A |
| collection | OXFORD |
| description | The sin²ψ technique for near-surface and bulk stress evaluation is frequently considered to be the method of reference, largely due to the historical reason of being established early on in the development of experimental study of residual stress, and due to the widespread availability of laboratory X-ray facilities equipped with goniometers allowing ψ-tilting to be carried out. In recent years other diffraction-based techniques of residual strain and residual stress evaluation have been developed, some of them based at large facilities such as synchrotrons, neutron reactors or spallation sources, and others becoming available in the laboratory setting. It is therefore perhaps relevant and timely to review the strengths and shortcomings of the sin²ψ technique in today's context. In the present study this task is addressed through the use of polycrystal elasto-plastic modelling that allows the determination of equivalent average elastic lattice strains following complex deformation history, and by post-processing of the model results in order to extract the parameters measurable in diffraction experiments. In particular, it is possible to extract the similated strain values that would be measured at different tilt angles, and to build a family of sin²ψ plots for different reflections. It then becomes possible to assess the degree to which the hypotheses underpinning the principle of this method are enforced or violated; to select the most suitable reflections; and to discuss how the method could be improved or varied to provide more reliable residual stress measurement procedures. |
| first_indexed | 2024-03-07T03:09:13Z |
| format | Journal article |
| id | oxford-uuid:b39aab03-c90a-455b-a6e4-ade27bee0485 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:09:13Z |
| publishDate | 2008 |
| publisher | Trans Tech Publications |
| record_format | dspace |
| spelling | oxford-uuid:b39aab03-c90a-455b-a6e4-ade27bee04852022-03-27T04:20:27ZA critical discussion of the sin²ψ stress measurement techniqueJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b39aab03-c90a-455b-a6e4-ade27bee0485Engineering & allied sciencesEnglishOxford University Research Archive - ValetTrans Tech Publications2008Korsunsky, AThe sin²ψ technique for near-surface and bulk stress evaluation is frequently considered to be the method of reference, largely due to the historical reason of being established early on in the development of experimental study of residual stress, and due to the widespread availability of laboratory X-ray facilities equipped with goniometers allowing ψ-tilting to be carried out. In recent years other diffraction-based techniques of residual strain and residual stress evaluation have been developed, some of them based at large facilities such as synchrotrons, neutron reactors or spallation sources, and others becoming available in the laboratory setting. It is therefore perhaps relevant and timely to review the strengths and shortcomings of the sin²ψ technique in today's context. In the present study this task is addressed through the use of polycrystal elasto-plastic modelling that allows the determination of equivalent average elastic lattice strains following complex deformation history, and by post-processing of the model results in order to extract the parameters measurable in diffraction experiments. In particular, it is possible to extract the similated strain values that would be measured at different tilt angles, and to build a family of sin²ψ plots for different reflections. It then becomes possible to assess the degree to which the hypotheses underpinning the principle of this method are enforced or violated; to select the most suitable reflections; and to discuss how the method could be improved or varied to provide more reliable residual stress measurement procedures. |
| spellingShingle | Engineering & allied sciences Korsunsky, A A critical discussion of the sin²ψ stress measurement technique |
| title | A critical discussion of the sin²ψ stress measurement technique |
| title_full | A critical discussion of the sin²ψ stress measurement technique |
| title_fullStr | A critical discussion of the sin²ψ stress measurement technique |
| title_full_unstemmed | A critical discussion of the sin²ψ stress measurement technique |
| title_short | A critical discussion of the sin²ψ stress measurement technique |
| title_sort | critical discussion of the sin²ψ stress measurement technique |
| topic | Engineering & allied sciences |
| work_keys_str_mv | AT korsunskya acriticaldiscussionofthesin2psstressmeasurementtechnique AT korsunskya criticaldiscussionofthesin2psstressmeasurementtechnique |