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Measurement of Highly Non-Uniform Residual Stress Fields with Reduced Plastic Error

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)1211-1224
Number of pages14
JournalExperimental Mechanics
Issue number7
Early online date18 Apr 2015
DateE-pub ahead of print - 18 Apr 2015
DatePublished (current) - Sep 2015


Experimental validations of a recently proposed method for residual stress measurement are presented. The method, specifically designed for highly non-uniform in-plane residual stress fields is applied in this work to measure the residual stresses resulting from four-point bend of an Aluminium 7075-T6 bar. The benefit of the method is that it can reconstruct stress fields without any assumptions of in-plane uniformity. The method uses two cuts, propagated from both side surfaces and collection of full-field relaxation displacement fields from side surfaces using 2D high-resolution digital image correlation (DIC). The reconstructed residual stress agrees well with that predicted by FE modelling and neutron diffraction measurement. In addition, it is shown that induced plastic strain during the relaxation process, which reduces accuracy of the method, is strongly influenced by the direction of the propagation of the cut. This implies that it is possible to reduce substantially plastic strain during cutting if the orientation and propagation of the cut is carefully chosen.

Additional information

Date of Acceptance: 06/04/2015

    Research areas

  • Digital Image Correlation, Mechanical strain relaxation, Plasticity, Residual stress, Semi-infinite strip

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Springer at Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF document


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