{"id":16214,"date":"2019-08-02T17:16:50","date_gmt":"2019-08-02T15:16:50","guid":{"rendered":"https:\/\/sonats-et.com\/?page_id=16214"},"modified":"2024-12-23T16:56:14","modified_gmt":"2024-12-23T15:56:14","slug":"contour-method-residual-stress","status":"publish","type":"page","link":"https:\/\/sonats-et.com\/en\/residual-stress\/contour-method-residual-stress\/","title":{"rendered":"Contour method for residual stress measurements"},"content":{"rendered":"

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Contour method for residual stress measurements<\/h2>\n

[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner width=”2\/3″][vc_column_text]The contour method is a measurement technique to create a mapping of residual stresses levels on the entire part section.\u00a0\u00a0<\/strong><\/p>\n

It allows to quickly compare the digital simulations.<\/p>\n

PRINCIPLE OF THE METHOD<\/h3>\n

To characterise stresses over the entire section of a part, the latter is cut in half using an optimised wire cut electro-erosion process.<\/p>\n

Under the effect of stress relief, the cutting surfaces do not remain flat. The surface deformations are measured using profilometry. This is then used to calculate the stresses on the whole section of the part via a finite element simulation inverse method.<\/p>\n

The Bueckner superposition principle – the basis of the contour method<\/strong><\/h4>\n

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Download our brochure for more specifications about the contour method for residual stresses measurement.<\/strong><\/span><\/p>\n

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Advantages of the contour method<\/strong><\/h4>\n

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Maps the entire section of a part\u00a0<\/span><\/p>\n

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Simplified comparison with digital simulations of forming processes<\/span><\/p>\n

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Measurement of large thicknesses<\/span><\/p>\n

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MEASUREMENT PROTOCOL<\/h3>\n

The SONATS laboratory has provided its expertise in all stages of the method thanks to a mastered protocol and fully automated calculations as well as a network of qualified partners.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner width=”1\/3″][vc_column_text]<\/p>\n

1.Cutting<\/span><\/strong><\/p>\n

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2.Profilometry<\/span><\/strong><\/span><\/p>\n

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3.Interpolation<\/span><\/strong><\/span><\/p>\n

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4.FE model data creation<\/span><\/strong><\/p>\n

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5.Calculation<\/span><\/strong><\/span><\/p>\n

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Software used<\/span><\/strong><\/span><\/p>\n

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Result examples of residual stresses measurement with the contour method<\/span><\/h2>\n

The contour method was applied to an aluminium plate peened on two opposite sides.\u00a0The results are presented as a map of the residual stresses over the entire thickness of the plate, and allow a complete analysis of the stress field.<\/p>\n

In this specific case we observe that:<\/p>\n